[1/3] powerpc: Avoid load hit store in __giveup_fpu() and __giveup_altivec()

[Michael Ellerman]

On Sun, 2016-29-05 at 12:03:50 UTC, Anton Blanchard wrote:
> From: Anton Blanchard <anton at samba.org>
> 
> In both __giveup_fpu() and __giveup_altivec() we make two modifications
> to tsk->thread.regs->msr. gcc decides to do a read/modify/write of
> each change, so we end up with a load hit store:
> 
>         ld      r9,264(r10)
>         rldicl  r9,r9,50,1
>         rotldi  r9,r9,14
>         std     r9,264(r10)
> ...
>         ld      r9,264(r10)
>         rldicl  r9,r9,40,1
>         rotldi  r9,r9,24
>         std     r9,264(r10)
> 
> Fix this by using a temporary.
> 
> Signed-off-by: Anton Blanchard <anton at samba.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8eb9803723a14fd12675641b95

cheers