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powerpc/64: indirect function call use bctrl rather than blrl in ret_from_kernel_thread

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blrl is not recommended to use as an indirect function call, as it may
corrupt the link stack predictor.

This is not a performance critical path but this should be fixed for
consistency.

Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
This commit is contained in:
Nicholas Piggin authored and Michael Ellerman committed 2020-06-22 10:37:55 +10:00
1 parent 48778464bb
commit 89bbe4c798
1 file changed
+2 -2
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arch/powerpc/kernel/entry_64.S
+2 -2
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@@ -233,12 +233,12 @@ _GLOBAL(ret_from_fork)
_GLOBAL(ret_from_kernel_thread)
bl schedule_tail
REST_NVGPRS(r1)
mtlr r14
mtctr r14
mr r3,r15
#ifdef PPC64_ELF_ABI_v2
mr r12,r14
#endif
blrl
bctrl
li r3,0
b .Lsyscall_exit