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

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Message-ID: <20131009122705.GG3081@twins.programming.kicks-ass.net>
Date:	Wed, 9 Oct 2013 14:27:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Wed, Oct 09, 2013 at 08:19:11PM +0800, Fengguang Wu wrote:
> > > Fengguang, I do not think this will help, but just in case. Could you
> > > show the result of
> > > 
> > >         $ kernel/task_work.s
> 
> Update: I recompiled the kernel with gcc 4.4.7 and find it booting fine!

> # 208 "/c/wfg/tip/arch/x86/include/asm/bitops.h" 1
> 	bts $1, 8(%eax); setc %dl	#,, c

That compiler doesn't appear to have asm goto support, so we fall back
to the code we already knew worked :-)
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