diff options
| author | Finn Thain <fthain@linux-m68k.org> | 2026-01-13 16:22:28 +1100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-01-26 19:07:15 -0800 |
| commit | 9a229ae249e0a24276901ad6807f31b32124f5c5 (patch) | |
| tree | 167bba8592cd6f7d4122f5eba529e6b1b6fb4016 /include/linux | |
| parent | 80047d84eed25e9c92cfb9169980a0dfec110246 (diff) | |
atomic: add option for weaker alignment check
Add a new Kconfig symbol to make CONFIG_DEBUG_ATOMIC more useful on those
architectures which do not align dynamic allocations to 8-byte boundaries.
Without this, CONFIG_DEBUG_ATOMIC produces excessive WARN splats.
Link: https://lkml.kernel.org/r/6d25a12934fe9199332f4d65d17c17de450139a8.1768281748.git.fthain@linux-m68k.org
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Hao Luo <haoluo@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Sasha Levin (Microsoft) <sashal@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/instrumented.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/instrumented.h b/include/linux/instrumented.h index e34b6a557e0a..a1b4cf81adc2 100644 --- a/include/linux/instrumented.h +++ b/include/linux/instrumented.h @@ -59,7 +59,13 @@ static __always_inline void instrument_read_write(const volatile void *v, size_t static __always_inline void instrument_atomic_check_alignment(const volatile void *v, size_t size) { #ifndef __DISABLE_EXPORTS - WARN_ON_ONCE(IS_ENABLED(CONFIG_DEBUG_ATOMIC) && ((unsigned long)v & (size - 1))); + if (IS_ENABLED(CONFIG_DEBUG_ATOMIC)) { + unsigned int mask = size - 1; + + if (IS_ENABLED(CONFIG_DEBUG_ATOMIC_LARGEST_ALIGN)) + mask &= sizeof(struct { long x; } __aligned_largest) - 1; + WARN_ON_ONCE((unsigned long)v & mask); + } #endif } |