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SubjectRe: [PATCH] x86: Make variable_test_bit reference all of *addr
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Memory clobbers are universal producers, not consumers.

Andi Kleen <andi@firstfloor.org> wrote:

>"hpanvin@gmail.com" <hpa@zytor.com> writes:
>
>
>> This is concerning... the kernel relies heavily on asm volatile being
>a universal memory consumer. If that is suddenly broken, we are f***
>in many, many, MANY places in the kernel all of a sudden!
>
>I don't think that's true. We generally add "memory" clobbers for this
>purpose. asm volatile just means "don't move"
>
>Just this one doesn't have it for unknown reasons (someone
>overoptimizing?)
>
>-Andi
>
>--
>ak@linux.intel.com -- Speaking for myself only

--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.


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