From: "H. Peter Anvin" <hpa@zytor.com>
To: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>,
Meelis Roos <mroos@linux.ee>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: 3.13: BUG: unable to handle kernel paging request at 00000000b4343e88
Date: Wed, 05 Feb 2014 09:36:03 -0800 [thread overview]
Message-ID: <52F27683.8090404@zytor.com> (raw)
In-Reply-To: <52F26E21.8000101@linux.vnet.ibm.com>
On 02/05/2014 09:00 AM, Peter Oberparleiter wrote:
>
> Could you give this patch a try? It is a variation of the approach
> proposed in the discussion mentioned earlier and fixes the problem
> on my system.
>
I would rather suggest that we explicitly disable gcov etc. from these
kinds of small, magic primitives. Honestly, you're just trying to put a
bandaid on a gaping wound.
The real thing here is that hweight.c is not a normal C file, and we
shouldn't treat is as such. It is a constrained environment, and trying
to tack crap like gcov to it is bound to lose, simply because gcov
doesn't know the rules it has to play by.
Even with the below change, if gcov clobbers, say, %rdx we're still screwed.
-hpa
next prev parent reply other threads:[~2014-02-05 17:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-21 10:34 3.13: BUG: unable to handle kernel paging request at 00000000b4343e88 Meelis Roos
2014-01-21 22:10 ` Andrew Morton
2014-01-22 15:33 ` Meelis Roos
2014-01-24 13:47 ` Peter Oberparleiter
2014-01-24 20:54 ` Meelis Roos
2014-01-27 15:53 ` Peter Oberparleiter
2014-01-28 6:33 ` Meelis Roos
2014-01-29 15:05 ` Peter Oberparleiter
[not found] ` <alpine.SOC.1.00.1401292242390.12718@math.ut.ee>
2014-01-31 15:50 ` Peter Oberparleiter
2014-02-05 17:00 ` Peter Oberparleiter
2014-02-05 17:36 ` H. Peter Anvin [this message]
2014-02-06 14:58 ` Peter Oberparleiter
2014-02-06 15:18 ` [tip:x86/urgent] x86, hweight: Fix BUG when booting with CONFIG_GCOV_PROFILE_ALL=y tip-bot for Peter Oberparleiter
2014-02-06 6:19 ` 3.13: BUG: unable to handle kernel paging request at 00000000b4343e88 Meelis Roos
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