linux-kernel - Re: [PATCH 1/3] memory-failure: Send right signal code to correct thread

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Message-Id: <20140602154431.2d77c066546354b9bd81e60b@linux-foundation.org>
Date:	Mon, 2 Jun 2014 15:44:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Tony Luck <tony.luck@...el.com>, Andi Kleen <andi@...stfloor.org>,
	Kamil Iskra <iskra@....anl.gov>, Borislav Petkov <bp@...e.de>,
	Chen Gong <gong.chen@...ux.jf.intel.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] memory-failure: Send right signal code to correct
 thread

On Fri, 30 May 2014 02:51:08 -0400 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> From: Tony Luck <tony.luck@...el.com>
> 
> When a thread in a multi-threaded application hits a machine
> check because of an uncorrectable error in memory - we want to
> send the SIGBUS with si.si_code = BUS_MCEERR_AR to that thread.
> Currently we fail to do that if the active thread is not the
> primary thread in the process. collect_procs() just finds primary
> threads and this test:
> 	if ((flags & MF_ACTION_REQUIRED) && t == current) {
> will see that the thread we found isn't the current thread
> and so send a si.si_code = BUS_MCEERR_AO to the primary
> (and nothing to the active thread at this time).
> 
> We can fix this by checking whether "current" shares the same
> mm with the process that collect_procs() said owned the page.
> If so, we send the SIGBUS to current (with code BUS_MCEERR_AR).
> 
> Reported-by: Otto Bruggeman <otto.g.bruggeman@...el.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> Cc: Andi Kleen <andi@...stfloor.org>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Chen Gong <gong.chen@...ux.jf.intel.com>
> Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

You were on the patch delivery path, so it should have included your
signed-off-by.  Documentation/SubmittingPatches section 12 has the
details.

I have made that change to my copies of patches 1 and 2.
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