linux-kernel - Re: Oops in a driver while using SLUB as a SLAB allocator

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Message-ID: <Pine.LNX.4.64.0706261107520.18010@schroedinger.engr.sgi.com>
Date:	Tue, 26 Jun 2007 11:09:46 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Russell King <rmk+lkml@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nicolas Ferre <nicolas.ferre@....atmel.com>,
	ARM Linux Mailing List 
	<linux-arm-kernel@...ts.arm.linux.org.uk>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Marc Pignat <marc.pignat@...s.ch>,
	Andrew Victor <andrew@...people.com>,
	Pierre Ossman <drzeus@...eus.cx>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Oops in a driver while using SLUB as a SLAB allocator

On Mon, 25 Jun 2007, Hugh Dickins wrote:

> Please reread mails of the last 20 hours.  Your "ARM fix" may or may not
> be a good thing, I don't know.  But it had nothing to do with this oops,
> which (we believe) came from a kmalloc in drivers/mmc/core/sd.c.  There
> are likely to be many other drivers which pass down kmalloc'ed buffers
> to routines which handle both kmalloc'ed buffers and page buffers.
> Though very few of those needing to flush_dcache_page.

If that is so then those functions may want to check PageSlab before 
calling flush_dcache_page.

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