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SubjectRe: PATCH] Use -mpreferred-stack-boundary=3 on x86-64 if supported
To keep gcc from paddong the stack to maintain a nonexistent alignment.

Andi Kleen <> wrote:

>> This patch uses -mpreferred-stack-boundary=3 on x86-64 if it is
>> I have been running 3.4 kernel compiled with this option for weeks.
>But why?
>All the SSE code in the kernel should adjust manually. And the other
>code doesn't need it.
>Besides the entry points do not guarantee alignment.
>For the kernel it would be probably more useful to have a attribute
>per function that forces alignment.
> -- Speaking for myself only.

Sent from my mobile phone. Please excuse brevity and lack of formatting.

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