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

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Message-ID: <20170111080925.GA5341@gondor.apana.org.au>
Date:   Wed, 11 Jan 2017 16:09:25 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86-64: Maintain 16-byte stack alignment

On Wed, Jan 11, 2017 at 08:06:54AM +0000, Ard Biesheuvel wrote:
>
> Couldn't we update the __aligned(x) macro to emit 32 if arch == x86
> and x == 16? All other cases should work just fine afaict

Not everyone uses that macro.  You'd also need to add some checks
to stop people from using the gcc __attribute__ directly.

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