diff options
| author | Marco Elver <elver@google.com> | 2019-12-12 01:07:09 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-01-07 07:47:23 -0800 |
| commit | e33f9a169747880a008dd5e7b934fc592e91cd63 (patch) | |
| tree | b5c00fc4c864945c6531a93d1802d79308e5ea24 | |
| parent | 7161177481d521e725a7bc6c9308ac2968fee038 (diff) | |
kcsan: Add __no_kcsan function attribute
Since the use of -fsanitize=thread is an implementation detail of KCSAN,
the name __no_sanitize_thread could be misleading if used widely.
Instead, we introduce the __no_kcsan attribute which is shorter and more
accurate in the context of KCSAN.
This matches the attribute name __no_kcsan_or_inline. The use of
__kcsan_or_inline itself is still required for __always_inline functions
to retain compatibility with older compilers.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
| -rw-r--r-- | include/linux/compiler-gcc.h | 3 | ||||
| -rw-r--r-- | include/linux/compiler.h | 7 |
2 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 0eb2a1cc411d..cf294faec2f8 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -146,8 +146,7 @@ #endif #if defined(__SANITIZE_THREAD__) && __has_attribute(__no_sanitize_thread__) -#define __no_sanitize_thread \ - __attribute__((__noinline__)) __attribute__((no_sanitize_thread)) +#define __no_sanitize_thread __attribute__((no_sanitize_thread)) #else #define __no_sanitize_thread #endif diff --git a/include/linux/compiler.h b/include/linux/compiler.h index ad8c76144a3c..8c0beb10c1dd 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -207,12 +207,15 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, # define __no_kasan_or_inline __always_inline #endif +#define __no_kcsan __no_sanitize_thread #ifdef __SANITIZE_THREAD__ /* * Rely on __SANITIZE_THREAD__ instead of CONFIG_KCSAN, to avoid not inlining in - * compilation units where instrumentation is disabled. + * compilation units where instrumentation is disabled. The attribute 'noinline' + * is required for older compilers, where implicit inlining of very small + * functions renders __no_sanitize_thread ineffective. */ -# define __no_kcsan_or_inline __no_sanitize_thread notrace __maybe_unused +# define __no_kcsan_or_inline __no_kcsan noinline notrace __maybe_unused # define __no_sanitize_or_inline __no_kcsan_or_inline #else # define __no_kcsan_or_inline __always_inline |