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

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Message-ID: <20131008185154.GA8258@redhat.com>
Date:	Tue, 8 Oct 2013 20:51:54 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Richard Henderson <rth@...ddle.net>,
	Jakub Jelinek <jakub@...hat.com>,
	Peter Zijlstra <peterz@...radead.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 10/08, Linus Torvalds wrote:
>
> (not yet merged), see:
>
>     http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=0c44c2d0f459cd7e275242b72f500137c4fa834d

I do not really understand inline assembly constraints, but I'll ask
anyway.

	+#define __GEN_RMWcc(fullop, var, cc, ...) \
	+do { \
	+ asm volatile goto (fullop "; j" cc " %l[cc_label]" \
	+ : : "m" (var), ## __VA_ARGS__ \
	      ^^^^^^^^^

don't we need

	"+m" (var)

here?

Oleg.

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