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241 lines
5.7 KiB
241 lines
5.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _KERNEL_EVENTS_INTERNAL_H |
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#define _KERNEL_EVENTS_INTERNAL_H |
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#include <linux/hardirq.h> |
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#include <linux/uaccess.h> |
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#include <linux/refcount.h> |
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/* Buffer handling */ |
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#define RING_BUFFER_WRITABLE 0x01 |
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struct perf_buffer { |
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refcount_t refcount; |
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struct rcu_head rcu_head; |
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#ifdef CONFIG_PERF_USE_VMALLOC |
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struct work_struct work; |
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int page_order; /* allocation order */ |
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#endif |
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int nr_pages; /* nr of data pages */ |
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int overwrite; /* can overwrite itself */ |
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int paused; /* can write into ring buffer */ |
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atomic_t poll; /* POLL_ for wakeups */ |
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local_t head; /* write position */ |
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unsigned int nest; /* nested writers */ |
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local_t events; /* event limit */ |
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local_t wakeup; /* wakeup stamp */ |
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local_t lost; /* nr records lost */ |
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long watermark; /* wakeup watermark */ |
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long aux_watermark; |
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/* poll crap */ |
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spinlock_t event_lock; |
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struct list_head event_list; |
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atomic_t mmap_count; |
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unsigned long mmap_locked; |
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struct user_struct *mmap_user; |
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/* AUX area */ |
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long aux_head; |
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unsigned int aux_nest; |
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long aux_wakeup; /* last aux_watermark boundary crossed by aux_head */ |
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unsigned long aux_pgoff; |
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int aux_nr_pages; |
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int aux_overwrite; |
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atomic_t aux_mmap_count; |
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unsigned long aux_mmap_locked; |
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void (*free_aux)(void *); |
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refcount_t aux_refcount; |
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int aux_in_sampling; |
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void **aux_pages; |
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void *aux_priv; |
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struct perf_event_mmap_page *user_page; |
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void *data_pages[]; |
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}; |
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extern void rb_free(struct perf_buffer *rb); |
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static inline void rb_free_rcu(struct rcu_head *rcu_head) |
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{ |
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struct perf_buffer *rb; |
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rb = container_of(rcu_head, struct perf_buffer, rcu_head); |
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rb_free(rb); |
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} |
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static inline void rb_toggle_paused(struct perf_buffer *rb, bool pause) |
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{ |
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if (!pause && rb->nr_pages) |
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rb->paused = 0; |
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else |
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rb->paused = 1; |
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} |
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extern struct perf_buffer * |
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rb_alloc(int nr_pages, long watermark, int cpu, int flags); |
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extern void perf_event_wakeup(struct perf_event *event); |
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extern int rb_alloc_aux(struct perf_buffer *rb, struct perf_event *event, |
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pgoff_t pgoff, int nr_pages, long watermark, int flags); |
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extern void rb_free_aux(struct perf_buffer *rb); |
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extern struct perf_buffer *ring_buffer_get(struct perf_event *event); |
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extern void ring_buffer_put(struct perf_buffer *rb); |
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static inline bool rb_has_aux(struct perf_buffer *rb) |
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{ |
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return !!rb->aux_nr_pages; |
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} |
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void perf_event_aux_event(struct perf_event *event, unsigned long head, |
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unsigned long size, u64 flags); |
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extern struct page * |
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perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff); |
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#ifdef CONFIG_PERF_USE_VMALLOC |
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/* |
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* Back perf_mmap() with vmalloc memory. |
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* |
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* Required for architectures that have d-cache aliasing issues. |
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*/ |
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static inline int page_order(struct perf_buffer *rb) |
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{ |
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return rb->page_order; |
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} |
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#else |
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static inline int page_order(struct perf_buffer *rb) |
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{ |
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return 0; |
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} |
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#endif |
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static inline unsigned long perf_data_size(struct perf_buffer *rb) |
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{ |
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return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); |
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} |
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static inline unsigned long perf_aux_size(struct perf_buffer *rb) |
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{ |
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return rb->aux_nr_pages << PAGE_SHIFT; |
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} |
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#define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...) \ |
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{ \ |
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unsigned long size, written; \ |
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\ |
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do { \ |
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size = min(handle->size, len); \ |
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written = memcpy_func(__VA_ARGS__); \ |
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written = size - written; \ |
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\ |
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len -= written; \ |
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handle->addr += written; \ |
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if (advance_buf) \ |
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buf += written; \ |
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handle->size -= written; \ |
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if (!handle->size) { \ |
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struct perf_buffer *rb = handle->rb; \ |
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\ |
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handle->page++; \ |
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handle->page &= rb->nr_pages - 1; \ |
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handle->addr = rb->data_pages[handle->page]; \ |
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handle->size = PAGE_SIZE << page_order(rb); \ |
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} \ |
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} while (len && written == size); \ |
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\ |
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return len; \ |
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} |
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#define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
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static inline unsigned long \ |
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func_name(struct perf_output_handle *handle, \ |
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const void *buf, unsigned long len) \ |
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__DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size) |
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static inline unsigned long |
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__output_custom(struct perf_output_handle *handle, perf_copy_f copy_func, |
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const void *buf, unsigned long len) |
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{ |
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unsigned long orig_len = len; |
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__DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf, |
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orig_len - len, size) |
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} |
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static inline unsigned long |
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memcpy_common(void *dst, const void *src, unsigned long n) |
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{ |
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memcpy(dst, src, n); |
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return 0; |
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} |
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DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
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static inline unsigned long |
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memcpy_skip(void *dst, const void *src, unsigned long n) |
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{ |
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return 0; |
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} |
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DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
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#ifndef arch_perf_out_copy_user |
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#define arch_perf_out_copy_user arch_perf_out_copy_user |
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static inline unsigned long |
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arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) |
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{ |
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unsigned long ret; |
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pagefault_disable(); |
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ret = __copy_from_user_inatomic(dst, src, n); |
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pagefault_enable(); |
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return ret; |
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} |
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#endif |
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DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) |
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static inline int get_recursion_context(int *recursion) |
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{ |
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unsigned char rctx = interrupt_context_level(); |
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if (recursion[rctx]) |
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return -1; |
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recursion[rctx]++; |
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barrier(); |
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return rctx; |
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} |
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static inline void put_recursion_context(int *recursion, int rctx) |
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{ |
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barrier(); |
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recursion[rctx]--; |
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} |
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#ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
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static inline bool arch_perf_have_user_stack_dump(void) |
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{ |
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return true; |
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} |
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#define perf_user_stack_pointer(regs) user_stack_pointer(regs) |
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#else |
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static inline bool arch_perf_have_user_stack_dump(void) |
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{ |
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return false; |
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} |
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#define perf_user_stack_pointer(regs) 0 |
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#endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ |
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#endif /* _KERNEL_EVENTS_INTERNAL_H */
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