linux-kernel - Re: [RESEND PATCH] selftests/pidfd: align stack to fix SP alignment exception

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Message-ID: <aH5NiFDmnLwh7J_w@willie-the-truck>
Date: Mon, 21 Jul 2025 15:24:08 +0100
From: Will Deacon <will@...nel.org>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: Shuai Xue <xueshuai@...ux.alibaba.com>, brauner@...nel.org,
	shuah@...nel.org, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, baolin.wang@...ux.alibaba.com,
	tianruidong@...ux.alibaba.com, catalin.marinas@....com,
	mark.rutland@....com
Subject: Re: [RESEND PATCH] selftests/pidfd: align stack to fix SP alignment
 exception

On Fri, Jul 18, 2025 at 03:10:32PM -0600, Shuah Khan wrote:
> Can you take a look at this and let me know if this change looks
> good to you both.
> 
> I can take this through my tree after your reviews.

I never got to the point of fully understanding how the test was
supposed to work, but it is true that arm64 requires a 16-byte aligned
stack pointer and this patch appears to achieve that.

Will