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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Ellerman <mpe@ellerman.id.au>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Paul Mackerras <paulus@samba.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread
Date: Fri, 27 Aug 2021 23:15:55 +1000	[thread overview]
Message-ID: <163007015584.52768.11072289865515594442.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <91b1d242525307ceceec7ef6e832bfbacdd4501b.1629436472.git.christophe.leroy@csgroup.eu>

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

      parent reply	other threads:[~2021-08-27 13:22 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20  5:16 Christophe Leroy
2021-08-20 12:15 ` Michael Ellerman
2021-08-20 17:18   ` Segher Boessenkool
2021-08-20 18:12     ` Segher Boessenkool
2021-08-27 13:15 ` Michael Ellerman [this message]

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