linux-kernel - Re: [x86] BUG: unable to handle kernel paging request at 00740060

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Date:	Thu, 10 Oct 2013 10:04:57 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Thu, Oct 10, 2013 at 08:51:04AM +0200, Jakub Jelinek wrote:
> @@ -8,6 +8,7 @@ foo (int a, int b)
>    asm volatile goto ("bts $1, %0; jc %l[lab]" : : "m" (b) : "memory" : lab);
>    return 0;
>  lab:
> +  asm ("");
>    return 0;
>  }

Or alternatively put the asm (""); right after asm goto,
  asm volatile goto ("bts $1, %0; jc %l[lab]" : : "m" (b) : "memory" : lab);
  asm ("");
  return ...;
lab;
  return ...;
What generates better code remains to be tested.  In any case, please
conditionalize the hacks on non-fixed compilers once the fix is released.

	Jakub
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