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| author | Marco Elver <elver@google.com> | 2020-01-07 17:31:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-03-21 09:40:19 +0100 |
| commit | 5c361425744d1e3b03d835dde659708683ca27d1 (patch) | |
| tree | bf0169fe9b9f4ecb2555c817c7bcf072bf777902 /kernel/kcsan/core.c | |
| parent | df10846ff2ac3b0a7b295be2de2e9215877982f3 (diff) | |
| download | linux-5c361425744d1e3b03d835dde659708683ca27d1.tar.gz linux-5c361425744d1e3b03d835dde659708683ca27d1.tar.bz2 linux-5c361425744d1e3b03d835dde659708683ca27d1.zip | |
kcsan: Prefer __always_inline for fast-path
Prefer __always_inline for fast-path functions that are called outside
of user_access_save, to avoid generating UACCESS warnings when
optimizing for size (CC_OPTIMIZE_FOR_SIZE). It will also avoid future
surprises with compiler versions that change the inlining heuristic even
when optimizing for performance.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/58708908-84a0-0a81-a836-ad97e33dbb62@infradead.org
Diffstat (limited to 'kernel/kcsan/core.c')
| -rw-r--r-- | kernel/kcsan/core.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c index 3314fc29e236..4d4ab5c5dc53 100644 --- a/kernel/kcsan/core.c +++ b/kernel/kcsan/core.c @@ -78,10 +78,10 @@ static atomic_long_t watchpoints[CONFIG_KCSAN_NUM_WATCHPOINTS + NUM_SLOTS-1]; */ static DEFINE_PER_CPU(long, kcsan_skip); -static inline atomic_long_t *find_watchpoint(unsigned long addr, - size_t size, - bool expect_write, - long *encoded_watchpoint) +static __always_inline atomic_long_t *find_watchpoint(unsigned long addr, + size_t size, + bool expect_write, + long *encoded_watchpoint) { const int slot = watchpoint_slot(addr); const unsigned long addr_masked = addr & WATCHPOINT_ADDR_MASK; @@ -146,7 +146,7 @@ insert_watchpoint(unsigned long addr, size_t size, bool is_write) * 2. the thread that set up the watchpoint already removed it; * 3. the watchpoint was removed and then re-used. */ -static inline bool +static __always_inline bool try_consume_watchpoint(atomic_long_t *watchpoint, long encoded_watchpoint) { return atomic_long_try_cmpxchg_relaxed(watchpoint, &encoded_watchpoint, CONSUMED_WATCHPOINT); @@ -160,7 +160,7 @@ static inline bool remove_watchpoint(atomic_long_t *watchpoint) return atomic_long_xchg_relaxed(watchpoint, INVALID_WATCHPOINT) != CONSUMED_WATCHPOINT; } -static inline struct kcsan_ctx *get_ctx(void) +static __always_inline struct kcsan_ctx *get_ctx(void) { /* * In interrupts, use raw_cpu_ptr to avoid unnecessary checks, that would @@ -169,7 +169,7 @@ static inline struct kcsan_ctx *get_ctx(void) return in_task() ? ¤t->kcsan_ctx : raw_cpu_ptr(&kcsan_cpu_ctx); } -static inline bool is_atomic(const volatile void *ptr) +static __always_inline bool is_atomic(const volatile void *ptr) { struct kcsan_ctx *ctx = get_ctx(); @@ -193,7 +193,7 @@ static inline bool is_atomic(const volatile void *ptr) return kcsan_is_atomic(ptr); } -static inline bool should_watch(const volatile void *ptr, int type) +static __always_inline bool should_watch(const volatile void *ptr, int type) { /* * Never set up watchpoints when memory operations are atomic. @@ -226,7 +226,7 @@ static inline void reset_kcsan_skip(void) this_cpu_write(kcsan_skip, skip_count); } -static inline bool kcsan_is_enabled(void) +static __always_inline bool kcsan_is_enabled(void) { return READ_ONCE(kcsan_enabled) && get_ctx()->disable_count == 0; } |