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511 lines
16 KiB
511 lines
16 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* NOTE: |
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* |
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* This header has combined a lot of unrelated to each other stuff. |
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* The process of splitting its content is in progress while keeping |
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* backward compatibility. That's why it's highly recommended NOT to |
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* include this header inside another header file, especially under |
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* generic or architectural include/ directory. |
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*/ |
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#ifndef _LINUX_KERNEL_H |
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#define _LINUX_KERNEL_H |
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#include <linux/stdarg.h> |
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#include <linux/align.h> |
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#include <linux/limits.h> |
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#include <linux/linkage.h> |
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#include <linux/stddef.h> |
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#include <linux/types.h> |
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#include <linux/compiler.h> |
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#include <linux/container_of.h> |
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#include <linux/bitops.h> |
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#include <linux/kstrtox.h> |
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#include <linux/log2.h> |
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#include <linux/math.h> |
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#include <linux/minmax.h> |
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#include <linux/typecheck.h> |
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#include <linux/panic.h> |
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#include <linux/printk.h> |
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#include <linux/build_bug.h> |
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#include <linux/static_call_types.h> |
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#include <linux/instruction_pointer.h> |
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#include <asm/byteorder.h> |
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#include <uapi/linux/kernel.h> |
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#define STACK_MAGIC 0xdeadbeef |
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/** |
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* REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value |
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* @x: value to repeat |
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* |
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* NOTE: @x is not checked for > 0xff; larger values produce odd results. |
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*/ |
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#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
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/* generic data direction definitions */ |
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#define READ 0 |
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#define WRITE 1 |
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/** |
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* ARRAY_SIZE - get the number of elements in array @arr |
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* @arr: array to be sized |
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*/ |
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
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#define PTR_IF(cond, ptr) ((cond) ? (ptr) : NULL) |
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#define u64_to_user_ptr(x) ( \ |
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{ \ |
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typecheck(u64, (x)); \ |
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(void __user *)(uintptr_t)(x); \ |
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} \ |
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) |
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/** |
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* upper_32_bits - return bits 32-63 of a number |
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* @n: the number we're accessing |
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* |
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* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
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* the "right shift count >= width of type" warning when that quantity is |
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* 32-bits. |
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*/ |
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#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
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/** |
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* lower_32_bits - return bits 0-31 of a number |
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* @n: the number we're accessing |
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*/ |
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#define lower_32_bits(n) ((u32)((n) & 0xffffffff)) |
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/** |
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* upper_16_bits - return bits 16-31 of a number |
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* @n: the number we're accessing |
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*/ |
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#define upper_16_bits(n) ((u16)((n) >> 16)) |
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/** |
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* lower_16_bits - return bits 0-15 of a number |
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* @n: the number we're accessing |
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*/ |
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#define lower_16_bits(n) ((u16)((n) & 0xffff)) |
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struct completion; |
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struct user; |
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#ifdef CONFIG_PREEMPT_VOLUNTARY_BUILD |
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extern int __cond_resched(void); |
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# define might_resched() __cond_resched() |
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#elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL) |
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extern int __cond_resched(void); |
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DECLARE_STATIC_CALL(might_resched, __cond_resched); |
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static __always_inline void might_resched(void) |
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{ |
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static_call_mod(might_resched)(); |
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} |
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#elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY) |
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extern int dynamic_might_resched(void); |
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# define might_resched() dynamic_might_resched() |
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#else |
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# define might_resched() do { } while (0) |
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#endif /* CONFIG_PREEMPT_* */ |
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
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extern void __might_resched(const char *file, int line, unsigned int offsets); |
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extern void __might_sleep(const char *file, int line); |
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extern void __cant_sleep(const char *file, int line, int preempt_offset); |
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extern void __cant_migrate(const char *file, int line); |
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/** |
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* might_sleep - annotation for functions that can sleep |
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* |
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* this macro will print a stack trace if it is executed in an atomic |
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* context (spinlock, irq-handler, ...). Additional sections where blocking is |
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* not allowed can be annotated with non_block_start() and non_block_end() |
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* pairs. |
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* |
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* This is a useful debugging help to be able to catch problems early and not |
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* be bitten later when the calling function happens to sleep when it is not |
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* supposed to. |
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*/ |
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# define might_sleep() \ |
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do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) |
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/** |
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* cant_sleep - annotation for functions that cannot sleep |
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* |
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* this macro will print a stack trace if it is executed with preemption enabled |
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*/ |
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# define cant_sleep() \ |
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do { __cant_sleep(__FILE__, __LINE__, 0); } while (0) |
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# define sched_annotate_sleep() (current->task_state_change = 0) |
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/** |
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* cant_migrate - annotation for functions that cannot migrate |
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* |
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* Will print a stack trace if executed in code which is migratable |
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*/ |
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# define cant_migrate() \ |
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do { \ |
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if (IS_ENABLED(CONFIG_SMP)) \ |
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__cant_migrate(__FILE__, __LINE__); \ |
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} while (0) |
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/** |
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* non_block_start - annotate the start of section where sleeping is prohibited |
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* |
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* This is on behalf of the oom reaper, specifically when it is calling the mmu |
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* notifiers. The problem is that if the notifier were to block on, for example, |
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* mutex_lock() and if the process which holds that mutex were to perform a |
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* sleeping memory allocation, the oom reaper is now blocked on completion of |
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* that memory allocation. Other blocking calls like wait_event() pose similar |
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* issues. |
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*/ |
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# define non_block_start() (current->non_block_count++) |
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/** |
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* non_block_end - annotate the end of section where sleeping is prohibited |
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* |
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* Closes a section opened by non_block_start(). |
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*/ |
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# define non_block_end() WARN_ON(current->non_block_count-- == 0) |
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#else |
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static inline void __might_resched(const char *file, int line, |
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unsigned int offsets) { } |
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static inline void __might_sleep(const char *file, int line) { } |
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# define might_sleep() do { might_resched(); } while (0) |
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# define cant_sleep() do { } while (0) |
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# define cant_migrate() do { } while (0) |
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# define sched_annotate_sleep() do { } while (0) |
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# define non_block_start() do { } while (0) |
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# define non_block_end() do { } while (0) |
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#endif |
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#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
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#if defined(CONFIG_MMU) && \ |
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(defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP)) |
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#define might_fault() __might_fault(__FILE__, __LINE__) |
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void __might_fault(const char *file, int line); |
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#else |
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static inline void might_fault(void) { } |
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#endif |
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void do_exit(long error_code) __noreturn; |
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extern int num_to_str(char *buf, int size, |
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unsigned long long num, unsigned int width); |
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/* lib/printf utilities */ |
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extern __printf(2, 3) int sprintf(char *buf, const char * fmt, ...); |
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extern __printf(2, 0) int vsprintf(char *buf, const char *, va_list); |
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extern __printf(3, 4) |
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int snprintf(char *buf, size_t size, const char *fmt, ...); |
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extern __printf(3, 0) |
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args); |
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extern __printf(3, 4) |
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int scnprintf(char *buf, size_t size, const char *fmt, ...); |
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extern __printf(3, 0) |
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int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); |
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extern __printf(2, 3) __malloc |
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char *kasprintf(gfp_t gfp, const char *fmt, ...); |
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extern __printf(2, 0) __malloc |
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char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
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extern __printf(2, 0) |
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const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args); |
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extern __scanf(2, 3) |
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int sscanf(const char *, const char *, ...); |
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extern __scanf(2, 0) |
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int vsscanf(const char *, const char *, va_list); |
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extern int no_hash_pointers_enable(char *str); |
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extern int get_option(char **str, int *pint); |
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extern char *get_options(const char *str, int nints, int *ints); |
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extern unsigned long long memparse(const char *ptr, char **retptr); |
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extern bool parse_option_str(const char *str, const char *option); |
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extern char *next_arg(char *args, char **param, char **val); |
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extern int core_kernel_text(unsigned long addr); |
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extern int __kernel_text_address(unsigned long addr); |
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extern int kernel_text_address(unsigned long addr); |
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extern int func_ptr_is_kernel_text(void *ptr); |
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extern void bust_spinlocks(int yes); |
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extern int root_mountflags; |
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extern bool early_boot_irqs_disabled; |
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/* |
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* Values used for system_state. Ordering of the states must not be changed |
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* as code checks for <, <=, >, >= STATE. |
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*/ |
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extern enum system_states { |
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SYSTEM_BOOTING, |
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SYSTEM_SCHEDULING, |
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SYSTEM_FREEING_INITMEM, |
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SYSTEM_RUNNING, |
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SYSTEM_HALT, |
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SYSTEM_POWER_OFF, |
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SYSTEM_RESTART, |
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SYSTEM_SUSPEND, |
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} system_state; |
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extern const char hex_asc[]; |
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#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] |
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#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] |
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static inline char *hex_byte_pack(char *buf, u8 byte) |
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{ |
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*buf++ = hex_asc_hi(byte); |
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*buf++ = hex_asc_lo(byte); |
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return buf; |
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} |
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extern const char hex_asc_upper[]; |
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#define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)] |
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#define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4] |
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static inline char *hex_byte_pack_upper(char *buf, u8 byte) |
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{ |
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*buf++ = hex_asc_upper_hi(byte); |
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*buf++ = hex_asc_upper_lo(byte); |
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return buf; |
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} |
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extern int hex_to_bin(unsigned char ch); |
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extern int __must_check hex2bin(u8 *dst, const char *src, size_t count); |
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extern char *bin2hex(char *dst, const void *src, size_t count); |
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bool mac_pton(const char *s, u8 *mac); |
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/* |
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* General tracing related utility functions - trace_printk(), |
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* tracing_on/tracing_off and tracing_start()/tracing_stop |
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* |
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* Use tracing_on/tracing_off when you want to quickly turn on or off |
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* tracing. It simply enables or disables the recording of the trace events. |
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* This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on |
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* file, which gives a means for the kernel and userspace to interact. |
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* Place a tracing_off() in the kernel where you want tracing to end. |
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* From user space, examine the trace, and then echo 1 > tracing_on |
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* to continue tracing. |
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* |
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* tracing_stop/tracing_start has slightly more overhead. It is used |
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* by things like suspend to ram where disabling the recording of the |
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* trace is not enough, but tracing must actually stop because things |
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* like calling smp_processor_id() may crash the system. |
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* |
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* Most likely, you want to use tracing_on/tracing_off. |
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*/ |
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enum ftrace_dump_mode { |
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DUMP_NONE, |
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DUMP_ALL, |
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DUMP_ORIG, |
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}; |
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#ifdef CONFIG_TRACING |
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void tracing_on(void); |
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void tracing_off(void); |
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int tracing_is_on(void); |
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void tracing_snapshot(void); |
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void tracing_snapshot_alloc(void); |
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extern void tracing_start(void); |
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extern void tracing_stop(void); |
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static inline __printf(1, 2) |
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void ____trace_printk_check_format(const char *fmt, ...) |
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{ |
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} |
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#define __trace_printk_check_format(fmt, args...) \ |
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do { \ |
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if (0) \ |
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____trace_printk_check_format(fmt, ##args); \ |
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} while (0) |
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/** |
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* trace_printk - printf formatting in the ftrace buffer |
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* @fmt: the printf format for printing |
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* |
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* Note: __trace_printk is an internal function for trace_printk() and |
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* the @ip is passed in via the trace_printk() macro. |
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* |
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* This function allows a kernel developer to debug fast path sections |
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* that printk is not appropriate for. By scattering in various |
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* printk like tracing in the code, a developer can quickly see |
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* where problems are occurring. |
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* |
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* This is intended as a debugging tool for the developer only. |
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* Please refrain from leaving trace_printks scattered around in |
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* your code. (Extra memory is used for special buffers that are |
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* allocated when trace_printk() is used.) |
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* |
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* A little optimization trick is done here. If there's only one |
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* argument, there's no need to scan the string for printf formats. |
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* The trace_puts() will suffice. But how can we take advantage of |
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* using trace_puts() when trace_printk() has only one argument? |
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* By stringifying the args and checking the size we can tell |
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* whether or not there are args. __stringify((__VA_ARGS__)) will |
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* turn into "()\0" with a size of 3 when there are no args, anything |
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* else will be bigger. All we need to do is define a string to this, |
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* and then take its size and compare to 3. If it's bigger, use |
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* do_trace_printk() otherwise, optimize it to trace_puts(). Then just |
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* let gcc optimize the rest. |
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*/ |
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#define trace_printk(fmt, ...) \ |
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do { \ |
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char _______STR[] = __stringify((__VA_ARGS__)); \ |
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if (sizeof(_______STR) > 3) \ |
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do_trace_printk(fmt, ##__VA_ARGS__); \ |
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else \ |
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trace_puts(fmt); \ |
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} while (0) |
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#define do_trace_printk(fmt, args...) \ |
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do { \ |
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static const char *trace_printk_fmt __used \ |
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__section("__trace_printk_fmt") = \ |
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__builtin_constant_p(fmt) ? fmt : NULL; \ |
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\ |
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__trace_printk_check_format(fmt, ##args); \ |
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\ |
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if (__builtin_constant_p(fmt)) \ |
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__trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ |
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else \ |
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__trace_printk(_THIS_IP_, fmt, ##args); \ |
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} while (0) |
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extern __printf(2, 3) |
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int __trace_bprintk(unsigned long ip, const char *fmt, ...); |
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extern __printf(2, 3) |
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int __trace_printk(unsigned long ip, const char *fmt, ...); |
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/** |
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* trace_puts - write a string into the ftrace buffer |
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* @str: the string to record |
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* |
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* Note: __trace_bputs is an internal function for trace_puts and |
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* the @ip is passed in via the trace_puts macro. |
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* |
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* This is similar to trace_printk() but is made for those really fast |
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* paths that a developer wants the least amount of "Heisenbug" effects, |
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* where the processing of the print format is still too much. |
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* |
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* This function allows a kernel developer to debug fast path sections |
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* that printk is not appropriate for. By scattering in various |
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* printk like tracing in the code, a developer can quickly see |
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* where problems are occurring. |
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* |
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* This is intended as a debugging tool for the developer only. |
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* Please refrain from leaving trace_puts scattered around in |
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* your code. (Extra memory is used for special buffers that are |
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* allocated when trace_puts() is used.) |
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* |
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* Returns: 0 if nothing was written, positive # if string was. |
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* (1 when __trace_bputs is used, strlen(str) when __trace_puts is used) |
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*/ |
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#define trace_puts(str) ({ \ |
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static const char *trace_printk_fmt __used \ |
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__section("__trace_printk_fmt") = \ |
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__builtin_constant_p(str) ? str : NULL; \ |
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\ |
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if (__builtin_constant_p(str)) \ |
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__trace_bputs(_THIS_IP_, trace_printk_fmt); \ |
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else \ |
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__trace_puts(_THIS_IP_, str, strlen(str)); \ |
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}) |
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extern int __trace_bputs(unsigned long ip, const char *str); |
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extern int __trace_puts(unsigned long ip, const char *str, int size); |
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extern void trace_dump_stack(int skip); |
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/* |
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* The double __builtin_constant_p is because gcc will give us an error |
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* if we try to allocate the static variable to fmt if it is not a |
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* constant. Even with the outer if statement. |
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*/ |
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#define ftrace_vprintk(fmt, vargs) \ |
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do { \ |
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if (__builtin_constant_p(fmt)) { \ |
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static const char *trace_printk_fmt __used \ |
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__section("__trace_printk_fmt") = \ |
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__builtin_constant_p(fmt) ? fmt : NULL; \ |
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\ |
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__ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \ |
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} else \ |
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__ftrace_vprintk(_THIS_IP_, fmt, vargs); \ |
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} while (0) |
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extern __printf(2, 0) int |
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__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap); |
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extern __printf(2, 0) int |
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__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap); |
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extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode); |
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#else |
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static inline void tracing_start(void) { } |
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static inline void tracing_stop(void) { } |
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static inline void trace_dump_stack(int skip) { } |
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static inline void tracing_on(void) { } |
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static inline void tracing_off(void) { } |
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static inline int tracing_is_on(void) { return 0; } |
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static inline void tracing_snapshot(void) { } |
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static inline void tracing_snapshot_alloc(void) { } |
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static inline __printf(1, 2) |
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int trace_printk(const char *fmt, ...) |
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{ |
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return 0; |
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} |
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static __printf(1, 0) inline int |
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ftrace_vprintk(const char *fmt, va_list ap) |
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{ |
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return 0; |
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} |
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static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { } |
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#endif /* CONFIG_TRACING */ |
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/* This counts to 12. Any more, it will return 13th argument. */ |
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#define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n |
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#define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
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#define __CONCAT(a, b) a ## b |
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#define CONCATENATE(a, b) __CONCAT(a, b) |
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/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */ |
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#ifdef CONFIG_FTRACE_MCOUNT_RECORD |
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# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD |
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#endif |
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/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ |
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#define VERIFY_OCTAL_PERMISSIONS(perms) \ |
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(BUILD_BUG_ON_ZERO((perms) < 0) + \ |
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BUILD_BUG_ON_ZERO((perms) > 0777) + \ |
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/* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ |
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BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ |
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BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ |
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/* USER_WRITABLE >= GROUP_WRITABLE */ \ |
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BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ |
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/* OTHER_WRITABLE? Generally considered a bad idea. */ \ |
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BUILD_BUG_ON_ZERO((perms) & 2) + \ |
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(perms)) |
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#endif
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