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246 lines
6.8 KiB
246 lines
6.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_GENERIC_BUG_H |
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#define _ASM_GENERIC_BUG_H |
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#include <linux/compiler.h> |
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#include <linux/instrumentation.h> |
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#define CUT_HERE "------------[ cut here ]------------\n" |
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#ifdef CONFIG_GENERIC_BUG |
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#define BUGFLAG_WARNING (1 << 0) |
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#define BUGFLAG_ONCE (1 << 1) |
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#define BUGFLAG_DONE (1 << 2) |
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#define BUGFLAG_NO_CUT_HERE (1 << 3) /* CUT_HERE already sent */ |
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#define BUGFLAG_TAINT(taint) ((taint) << 8) |
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#define BUG_GET_TAINT(bug) ((bug)->flags >> 8) |
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#endif |
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#ifndef __ASSEMBLY__ |
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#include <linux/kernel.h> |
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#ifdef CONFIG_BUG |
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#ifdef CONFIG_GENERIC_BUG |
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struct bug_entry { |
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#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
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unsigned long bug_addr; |
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#else |
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signed int bug_addr_disp; |
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#endif |
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#ifdef CONFIG_DEBUG_BUGVERBOSE |
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#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
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const char *file; |
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#else |
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signed int file_disp; |
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#endif |
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unsigned short line; |
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#endif |
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unsigned short flags; |
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}; |
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#endif /* CONFIG_GENERIC_BUG */ |
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/* |
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* Don't use BUG() or BUG_ON() unless there's really no way out; one |
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* example might be detecting data structure corruption in the middle |
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* of an operation that can't be backed out of. If the (sub)system |
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* can somehow continue operating, perhaps with reduced functionality, |
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* it's probably not BUG-worthy. |
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* |
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* If you're tempted to BUG(), think again: is completely giving up |
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* really the *only* solution? There are usually better options, where |
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* users don't need to reboot ASAP and can mostly shut down cleanly. |
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*/ |
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#ifndef HAVE_ARCH_BUG |
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#define BUG() do { \ |
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printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ |
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barrier_before_unreachable(); \ |
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panic("BUG!"); \ |
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} while (0) |
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#endif |
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#ifndef HAVE_ARCH_BUG_ON |
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#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) |
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#endif |
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/* |
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* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report |
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* significant kernel issues that need prompt attention if they should ever |
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* appear at runtime. |
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* |
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* Do not use these macros when checking for invalid external inputs |
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* (e.g. invalid system call arguments, or invalid data coming from |
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* network/devices), and on transient conditions like ENOMEM or EAGAIN. |
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* These macros should be used for recoverable kernel issues only. |
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* For invalid external inputs, transient conditions, etc use |
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* pr_err[_once/_ratelimited]() followed by dump_stack(), if necessary. |
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* Do not include "BUG"/"WARNING" in format strings manually to make these |
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* conditions distinguishable from kernel issues. |
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* |
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* Use the versions with printk format strings to provide better diagnostics. |
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*/ |
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#ifndef __WARN_FLAGS |
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extern __printf(4, 5) |
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void warn_slowpath_fmt(const char *file, const int line, unsigned taint, |
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const char *fmt, ...); |
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#define __WARN() __WARN_printf(TAINT_WARN, NULL) |
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#define __WARN_printf(taint, arg...) do { \ |
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instrumentation_begin(); \ |
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warn_slowpath_fmt(__FILE__, __LINE__, taint, arg); \ |
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instrumentation_end(); \ |
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} while (0) |
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#else |
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extern __printf(1, 2) void __warn_printk(const char *fmt, ...); |
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#define __WARN() __WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN)) |
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#define __WARN_printf(taint, arg...) do { \ |
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instrumentation_begin(); \ |
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__warn_printk(arg); \ |
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__WARN_FLAGS(BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ |
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instrumentation_end(); \ |
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} while (0) |
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#define WARN_ON_ONCE(condition) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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if (unlikely(__ret_warn_on)) \ |
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__WARN_FLAGS(BUGFLAG_ONCE | \ |
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BUGFLAG_TAINT(TAINT_WARN)); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#endif |
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/* used internally by panic.c */ |
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struct warn_args; |
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struct pt_regs; |
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void __warn(const char *file, int line, void *caller, unsigned taint, |
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struct pt_regs *regs, struct warn_args *args); |
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#ifndef WARN_ON |
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#define WARN_ON(condition) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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if (unlikely(__ret_warn_on)) \ |
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__WARN(); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#endif |
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#ifndef WARN |
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#define WARN(condition, format...) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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if (unlikely(__ret_warn_on)) \ |
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__WARN_printf(TAINT_WARN, format); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#endif |
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#define WARN_TAINT(condition, taint, format...) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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if (unlikely(__ret_warn_on)) \ |
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__WARN_printf(taint, format); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#ifndef WARN_ON_ONCE |
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#define WARN_ON_ONCE(condition) ({ \ |
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static bool __section(".data.once") __warned; \ |
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int __ret_warn_once = !!(condition); \ |
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\ |
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if (unlikely(__ret_warn_once && !__warned)) { \ |
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__warned = true; \ |
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WARN_ON(1); \ |
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} \ |
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unlikely(__ret_warn_once); \ |
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}) |
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#endif |
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#define WARN_ONCE(condition, format...) ({ \ |
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static bool __section(".data.once") __warned; \ |
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int __ret_warn_once = !!(condition); \ |
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\ |
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if (unlikely(__ret_warn_once && !__warned)) { \ |
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__warned = true; \ |
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WARN(1, format); \ |
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} \ |
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unlikely(__ret_warn_once); \ |
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}) |
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#define WARN_TAINT_ONCE(condition, taint, format...) ({ \ |
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static bool __section(".data.once") __warned; \ |
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int __ret_warn_once = !!(condition); \ |
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\ |
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if (unlikely(__ret_warn_once && !__warned)) { \ |
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__warned = true; \ |
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WARN_TAINT(1, taint, format); \ |
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} \ |
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unlikely(__ret_warn_once); \ |
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}) |
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#else /* !CONFIG_BUG */ |
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#ifndef HAVE_ARCH_BUG |
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#define BUG() do {} while (1) |
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#endif |
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#ifndef HAVE_ARCH_BUG_ON |
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#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) |
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#endif |
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#ifndef HAVE_ARCH_WARN_ON |
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#define WARN_ON(condition) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#endif |
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#ifndef WARN |
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#define WARN(condition, format...) ({ \ |
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int __ret_warn_on = !!(condition); \ |
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no_printk(format); \ |
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unlikely(__ret_warn_on); \ |
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}) |
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#endif |
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#define WARN_ON_ONCE(condition) WARN_ON(condition) |
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#define WARN_ONCE(condition, format...) WARN(condition, format) |
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#define WARN_TAINT(condition, taint, format...) WARN(condition, format) |
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#define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) |
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#endif |
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/* |
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* WARN_ON_SMP() is for cases that the warning is either |
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* meaningless for !SMP or may even cause failures. |
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* It can also be used with values that are only defined |
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* on SMP: |
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* |
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* struct foo { |
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* [...] |
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* #ifdef CONFIG_SMP |
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* int bar; |
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* #endif |
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* }; |
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* |
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* void func(struct foo *zoot) |
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* { |
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* WARN_ON_SMP(!zoot->bar); |
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* |
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* For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), |
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* and should be a nop and return false for uniprocessor. |
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* |
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* if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set |
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* and x is true. |
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*/ |
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#ifdef CONFIG_SMP |
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# define WARN_ON_SMP(x) WARN_ON(x) |
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#else |
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/* |
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* Use of ({0;}) because WARN_ON_SMP(x) may be used either as |
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* a stand alone line statement or as a condition in an if () |
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* statement. |
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* A simple "0" would cause gcc to give a "statement has no effect" |
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* warning. |
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*/ |
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# define WARN_ON_SMP(x) ({0;}) |
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#endif |
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#endif /* __ASSEMBLY__ */ |
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#endif
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