| Message ID | 20240924115001.916112-1-Jason@zx2c4.com |
|---|---|
| State | New |
| Headers | show |
| Series | selftests: vDSO: align stack for O2-optimized memcpy | expand |
Hi Shuah, On Tue, Sep 24, 2024 at 01:47:23PM +0200, Jason A. Donenfeld wrote: > When switching on -O2, gcc generates SSE2 instructions that assume a > 16-byte aligned stack, which the standalone test's start point wasn't > aligning. Fix this with the usual alignnent sequence. > > Fixes: ecb8bd70d51 ("selftests: vDSO: build tests with O2 optimization") > Reported-by: kernel test robot <oliver.sang@intel.com> > Closes: https://lore.kernel.org/oe-lkp/202409241558.98e13f6f-oliver.sang@intel.com > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Just FYI, I'm expecting that this is a patch you take through your tree for 6.12, and hopefully before rc1, as automated testing is failing. Jason
On 9/27/24 11:24, Jason A. Donenfeld wrote: > Hi Shuah, > > On Tue, Sep 24, 2024 at 01:47:23PM +0200, Jason A. Donenfeld wrote: >> When switching on -O2, gcc generates SSE2 instructions that assume a >> 16-byte aligned stack, which the standalone test's start point wasn't >> aligning. Fix this with the usual alignnent sequence. I fixed this spelling when I apply. checkpatch is good at catching these by the way. >> >> Fixes: ecb8bd70d51 ("selftests: vDSO: build tests with O2 optimization") >> Reported-by: kernel test robot <oliver.sang@intel.com> >> Closes: https://lore.kernel.org/oe-lkp/202409241558.98e13f6f-oliver.sang@intel.com >> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> > > Just FYI, I'm expecting that this is a patch you take through your tree > for 6.12, and hopefully before rc1, as automated testing is failing. > > Jason Okay. Thanks for letting me know. I will try to send this up for rc1 if at all possible. Applied to linux-kselftest next thanks, -- Shuah
diff --git a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c index 27f6fdf11969..644915862af8 100644 --- a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c +++ b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c @@ -131,6 +131,8 @@ asm ( "_start:\n\t" #ifdef __x86_64__ "mov %rsp,%rdi\n\t" + "and $-16,%rsp\n\t" + "sub $8,%rsp\n\t" "jmp c_main" #else "push %esp\n\t"
When switching on -O2, gcc generates SSE2 instructions that assume a 16-byte aligned stack, which the standalone test's start point wasn't aligning. Fix this with the usual alignnent sequence. Fixes: ecb8bd70d51 ("selftests: vDSO: build tests with O2 optimization") Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202409241558.98e13f6f-oliver.sang@intel.com Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- tools/testing/selftests/vDSO/vdso_standalone_test_x86.c | 2 ++ 1 file changed, 2 insertions(+)