linux-kernel - Re: [PATCH] selftests: vDSO: align stack for O2-optimized memcpy

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Message-ID: <ZvbqNZz547IGq7vy@zx2c4.com>
Date: Fri, 27 Sep 2024 19:24:05 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: christophe.leroy@...roup.eu, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org, skhan@...uxfoundation.org
Cc: kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH] selftests: vDSO: align stack for O2-optimized memcpy

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@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202409241558.98e13f6f-oliver.sang@intel.com
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.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