From: Puranjay Mohan Date: Thu, 10 Jul 2025 17:54:33 +0000 (+0000) Subject: selftests/bpf: fix implementation of smp_mb() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0769857a07b4451a1dc1c3ad1f1c86a6f4ce136a;p=thirdparty%2Fkernel%2Fstable.git selftests/bpf: fix implementation of smp_mb() As BPF doesn't include any barrier instructions, smp_mb() is implemented by doing a dummy value returning atomic operation. Such an operation acts a full barrier as enforced by LKMM and also by the work in progress BPF memory model. If the returned value is not used, clang[1] can optimize the value returning atomic instruction in to a normal atomic instruction which provides no ordering guarantees. Mark the variable as volatile so the above optimization is never performed and smp_mb() works as expected. [1] https://godbolt.org/z/qzze7bG6z Fixes: 88d706ba7cc5 ("selftests/bpf: Introduce arena spin lock") Signed-off-by: Puranjay Mohan Link: https://lore.kernel.org/r/20250710175434.18829-2-puranjay@kernel.org Signed-off-by: Alexei Starovoitov --- diff --git a/tools/testing/selftests/bpf/bpf_atomic.h b/tools/testing/selftests/bpf/bpf_atomic.h index a9674e544322..c550e5711967 100644 --- a/tools/testing/selftests/bpf/bpf_atomic.h +++ b/tools/testing/selftests/bpf/bpf_atomic.h @@ -61,7 +61,7 @@ extern bool CONFIG_X86_64 __kconfig __weak; #define smp_mb() \ ({ \ - unsigned long __val; \ + volatile unsigned long __val; \ __sync_fetch_and_add(&__val, 0); \ })