LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	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, 20 Aug 2021 12:18:45 -0500	[thread overview]
Message-ID: <20210820171845.GS1583@gate.crashing.org> (raw)
In-Reply-To: <871r6oe2i8.fsf@mpe.ellerman.id.au>

On Fri, Aug 20, 2021 at 10:15:11PM +1000, Michael Ellerman wrote:
> Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> > 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.
> 
> Do we know if any 32-bit CPUs have a link stack predictor or similar?

74xx do.


Segher

  reply	other threads:[~2021-08-20 17:24 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 [this message]
2021-08-20 18:12     ` Segher Boessenkool
2021-08-27 13:15 ` Michael Ellerman

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210820171845.GS1583@gate.crashing.org \
    --to=segher@kernel.crashing.org \
    --cc=benh@kernel.crashing.org \
    --cc=christophe.leroy@csgroup.eu \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=paulus@samba.org \
    --subject='Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).