Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread
From: Michael Ellerman <hidden>
Date: 2021-08-27 13:22:45
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On Fri, 20 Aug 2021 05:16:05 +0000 (UTC), Christophe Leroy wrote:
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.
[...]
Applied to powerpc/next.
[1/1] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread
https://git.kernel.org/powerpc/c/113ec9ccc8049c3772f0eab46b62c5d6654c09f7
cheers