linux-kernel - RE: [PATCH 0/3] HWPOISON: improve memory error handling for multithread process

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F328268B7@ORSMSX114.amr.corp.intel.com>
Date:	Mon, 2 Jun 2014 23:37:58 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	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-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: RE: [PATCH 0/3] HWPOISON: improve memory error handling for
 multithread process

> I'm not sure that "[PATCH 3/3] mm/memory-failure.c: support dedicated
> thread to handle SIGBUS(BUS_MCEERR_AO)" is a -stable thing?  That's a
> feature addition more than a bugfix?

No - the old behavior was crazy - someone with a multithreaded process might
well expect that if they call prctl(PF_MCE_EARLY) in just one thread, then that
thread would see the SIGBUS  with si_code = BUS_MCEERR_A0 - even if that
thread wasn't the main thread for the process.

Perhaps the description for the commit should better reflect that?

-Tony



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