linux-kernel - Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault

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Date:   Mon, 22 Aug 2016 16:48:00 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Jakub Jelinek <jakub@...hat.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault

On Mon, Aug 22, 2016 at 4:12 PM, H. Peter Anvin <hpa@...or.com> wrote:
>
> How about the gcc native __builtin_setjmp stuff which is supposedly better?

How new is it? The whole point was that we'd not have to worry and
wait for gcc features..

glibc doesn't use it, which worries me a bit. Has it ever gotten any
use/testing?

But yes, the compiler could do better. If we can rely on it, and it
doesn't do stupid things (like have signal state etc crap - glibc
seems to just alias "setjmp" to "sigsetjmp" with a "didn't save
signals" flag)

             Linus