linux-kernel - Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

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Date:	Thu, 6 Mar 2008 09:14:00 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Jakub Jelinek" <jakub@...hat.com>,
	NightStrike <nightstrike@...il.com>,
	"Olivier Galibert" <galibert@...ox.com>,
	"Chris Lattner" <clattner@...le.com>,
	"Michael Matz" <matz@...e.de>,
	"Richard Guenther" <richard.guenther@...il.com>,
	"Joe Buck" <Joe.Buck@...opsys.com>, "Jan Hubicka" <hubicka@....cz>,
	"Aurelien Jarno" <aurelien@...el32.net>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

On Thu, Mar 6, 2008 at 9:06 AM, H. Peter Anvin <hpa@...or.com> wrote:
>
> H.J. Lu wrote:
>  > On Thu, Mar 6, 2008 at 8:23 AM, Jakub Jelinek <jakub@...hat.com> wrote:
>  >> On Thu, Mar 06, 2008 at 07:50:12AM -0800, H. Peter Anvin wrote:
>  >>  > H.J. Lu wrote:
>  >>  > >I agree with it. There is no  right or wrong here Let's start from
>  >>  > >scratch and figure out
>  >>  > >what is the best way to handle this, assuming we are defining a new psABI.
>  >>
>  >>  BTW, just tested icc and icc doesn't generate cld either (so it matches the
>  >>  new gcc behavior).
>  >>  char buf1[32], buf2[32];
>  >>  void bar (void);
>  >>  void foo (void)
>  >>  {
>  >>   __builtin_memset (buf1, 0, 32);
>  >>   bar ();
>  >>   __builtin_memset (buf2, 0, 32);
>  >>  }
>  >>
>  >
>  > Icc follows the psABI. If we are saying icc/gcc 4.3 need a fix, we'd
>  > better define
>  > a new psABI first.
>  >
>
>  Not a fix, an (optional) workaround for a system bug.
>

So that is the bug in the Linux kernel. Since fixing kernel is much easier
than providing a workaround in compilers, I think kernel should be fixed
and no need for icc/gcc fix.


H.J.
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