| commit | 113ec9ccc8049c3772f0eab46b62c5d6654c09f7 | [log] [tgz] |
|---|---|---|
| author | Christophe Leroy <[email protected]> | Fri Aug 20 05:16:05 2021 +0000 |
| committer | Michael Ellerman <[email protected]> | Wed Aug 25 13:35:47 2021 +1000 |
| tree | 90ac467577fe6ad15926c57c97d3579be5c0da41 | |
| parent | cc47ad409ba9cc950e9c492c8ba653dabd392148 [diff] |
powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread
Copied from commit 89bbe4c798bc ("powerpc/64: indirect function call
use bctrl rather than blrl in ret_from_kernel_thread")
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: Christophe Leroy <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/91b1d242525307ceceec7ef6e832bfbacdd4501b.1629436472.git.christophe.leroy@csgroup.eu
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 0273a13..61fdd53 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S
@@ -161,10 +161,10 @@ ret_from_kernel_thread: REST_NVGPRS(r1) bl schedule_tail - mtlr r14 + mtctr r14 mr r3,r15 PPC440EP_ERR42 - blrl + bctrl li r3,0 b ret_from_syscall