Re: x86-64: Maintain 16-byte stack alignment

Path	csiph.com!aioe.org!bofh.it!news.nic.it!robomod
From	Herbert Xu <herbert@gondor.apana.org.au>
Newsgroups	linux.kernel
Subject	Re: x86-64: Maintain 16-byte stack alignment
Date	Thu, 12 Jan 2017 07:20:02 +0100
Message-ID	<sYGTU-wt-1@gated-at.bofh.it> (permalink)
References	<sY5KF-2vR-21@gated-at.bofh.it> <sY8yR-4e0-15@gated-at.bofh.it>
X-Original-To	Ard Biesheuvel <ard.biesheuvel@linaro.org>
MIME-Version	1.0
Content-Type	text/plain; charset=us-ascii
Content-Disposition	inline
User-Agent	Mutt/1.5.23 (2014-03-12)
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	16
Organization	linux.* mail to news gateway
X-Original-Cc	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux Crypto Mailing List <linux-crypto@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Andy Lutomirski <luto@kernel.org>
X-Original-Date	Thu, 12 Jan 2017 14:12:11 +0800
X-Original-Message-ID	<20170112061211.GA10247@gondor.apana.org.au>
X-Original-References	<20170110143340.GA3787@gondor.apana.org.au> <CAKv+Gu8xVrfR=J5b2pGK7R5Tv-M3xZhL_dnTvvM7nTZLLtC-EQ@mail.gmail.com>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1557133

Show key headers only | View raw

On Tue, Jan 10, 2017 at 05:30:48PM +0000, Ard Biesheuvel wrote:
>
> Apologies for introducing this breakage. It seemed like an obvious and
> simple cleanup, so I didn't even bother to mention it in the commit
> log, but if the kernel does not guarantee 16 byte alignment, I guess
> we should revert to the old method. If SSE instructions are the only
> ones that require this alignment, then I suppose not having a ABI
> conforming stack pointer should not be an issue in general.

BTW Ard, what is the stack alignment on ARM64?

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Thread

x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-10 15:40 +0100
  Re: x86-64: Maintain 16-byte stack alignment Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-01-10 18:40 +0100
    Re: x86-64: Maintain 16-byte stack alignment Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-01-10 20:20 +0100
      Re: x86-64: Maintain 16-byte stack alignment Andy Lutomirski <luto@amacapital.net> - 2017-01-10 20:30 +0100
        Re: x86-64: Maintain 16-byte stack alignment Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-01-10 21:10 +0100
          Re: x86-64: Maintain 16-byte stack alignment Andy Lutomirski <luto@amacapital.net> - 2017-01-11 00:30 +0100
            Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-11 04:30 +0100
        Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-11 04:30 +0100
    Re: x86-64: Maintain 16-byte stack alignment Andy Lutomirski <luto@amacapital.net> - 2017-01-10 20:50 +0100
      Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-11 04:20 +0100
    Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-11 04:20 +0100
    Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-12 07:20 +0100
      Re: x86-64: Maintain 16-byte stack alignment Herbert Xu <herbert@gondor.apana.org.au> - 2017-01-12 09:10 +0100
      Re: x86-64: Maintain 16-byte stack alignment Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-01-12 09:10 +0100

csiph-web