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powerpc: Avoid an unnecessary test and branch in longjmp()

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Doing the test at exit of the function avoids an unnecessary
test and branch inside longjmp().

Semantics are unchanged.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-04-17 19:08:16 +02:00 committed by Michael Ellerman
parent 96f391cf40
commit 24c78586cc
1 changed files with 4 additions and 5 deletions
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9
arch/powerpc/kernel/misc.S
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@ -85,10 +85,7 @@ _GLOBAL(setjmp)
blr
_GLOBAL(longjmp)
PPC_LCMPI r4,0
bne 1f
li r4,1
1: PPC_LL r13,4*SZL(r3)
PPC_LL r13,4*SZL(r3)
PPC_LL r14,5*SZL(r3)
PPC_LL r15,6*SZL(r3)
PPC_LL r16,7*SZL(r3)
@ -113,7 +110,9 @@ _GLOBAL(longjmp)
PPC_LL r1,SZL(r3)
PPC_LL r2,2*SZL(r3)
mtlr r0
mr r3,r4
mr. r3, r4
bnelr
li r3, 1
blr
_GLOBAL(current_stack_pointer)