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powerpc: Move part of giveup_vsx into c

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Move the MSR modification into c. Removing it from the assembly
function will allow us to avoid costly MSR writes by batching them
up.

Check the FP and VMX bits before calling the relevant giveup_*()
function. This makes giveup_vsx() and flush_vsx_to_thread() perform
more like their sister functions, and allows us to use
flush_vsx_to_thread() in the signal code.

Move the check_if_tm_restore_required() check in.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard
2015-10-29 11:44:02 +11:00
committed by Michael Ellerman
parent 98da581e08
commit a7d623d4d0
4 changed files with 23 additions and 19 deletions
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6
arch/powerpc/kernel/vector.S
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@ -177,14 +177,8 @@ _GLOBAL(load_up_vsx)
* __giveup_vsx(tsk)
* Disable VSX for the task given as the argument.
* Does NOT save vsx registers.
* Enables the VSX for use in the kernel on return.
*/
_GLOBAL(__giveup_vsx)
mfmsr r5
oris r5,r5,MSR_VSX@h
mtmsrd r5 /* enable use of VSX now */
isync
addi r3,r3,THREAD /* want THREAD of task */
ld r5,PT_REGS(r3)
cmpdi 0,r5,0