1#ifndef _ASM_TRACE_COMMON_H
2#define _ASM_TRACE_COMMON_H
3
4#ifdef CONFIG_TRACING
5DECLARE_STATIC_KEY_FALSE(trace_pagefault_key);
6#define trace_pagefault_enabled() \
7 static_branch_unlikely(&trace_pagefault_key)
8#else
9static inline bool trace_pagefault_enabled(void) { return false; }
10#endif
11
12#endif
13

source code of linux/arch/x86/include/asm/trace/common.h