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

[Nicholas Piggin]

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 <npig...@gmail.com>
---
 arch/powerpc/kernel/entry_64.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 223c4f008e63..f59a17471d4d 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -400,12 +400,12 @@ _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
 
-- 
2.23.0