linux-kernel - Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel

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Message-Id: <163007015584.52768.11072289865515594442.b4-ty@ellerman.id.au>
Date:   Fri, 27 Aug 2021 23:15:55 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread

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