Commit 24c78586 authored Apr 17, 2018 by Christophe Leroy Committed by Michael Ellerman May 18, 2018

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



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>

parent 96f391cf

arch/powerpc/kernel/misc.S

+4 −5

Original line number	Diff line number	Diff line
		@@ -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)