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

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Message-ID: <20170112150650.GA16000@gondor.apana.org.au>
Date:   Thu, 12 Jan 2017 23:06:50 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: x86-64: Maintain 16-byte stack alignment

On Thu, Jan 12, 2017 at 09:03:18AM -0600, Josh Poimboeuf wrote:
> 
> For the entry code, could we just replace all calls with CALL_ALIGNED?
> That might be less intrusive than trying to adjust all the pt_regs
> accesses.
> 
> Then to ensure that nobody ever uses 'call' directly:
> 
>   '#define call please-use-CALL-ALIGNED-instead-of-call'
> 
> I think that would be possible if CALL_ALIGNED were a ".macro".

The trouble with that is that you have got things like TRACE_IRQS_OFF
which are also used outside of the entry code.

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