linux-kernel - Re: [PATCH rc8-mm1] hotfix libata-scsi corruption

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Message-Id: <1201046335.14436.92.camel@cinder.waste.org>
Date:	Tue, 22 Jan 2008 17:58:54 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH rc8-mm1] hotfix libata-scsi corruption


On Tue, 2008-01-22 at 22:59 +0000, Hugh Dickins wrote:
> On Tue, 22 Jan 2008, James Bottomley wrote:
> > 
> > libsas looks to be OK because it specifically kmallocs a 512 byte buffer
> > which should (for off slab data) be 512 byte aligned.
> 
> I don't remember the various SLAB and SLOB and SLUB rules offhand:
> I'm not sure it's safe to rely on such alignment on all of them ....

It doesn't work that way with SLOB kmalloc (nor did it in pre-slabified
kmalloc). One shouldn't be surprised if a SLAB/SLUB debugging feature
breaks that alignment either.

-- 
Mathematics is the supreme nostalgia of our time.

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