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Date:	Fri, 22 Jun 2007 06:37:03 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Christoph Lameter <clameter@....com>
cc:	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <rmk@....linux.org.uk>
Subject: Re: Oops in a driver while using SLUB as a SLAB allocator

On Thu, 21 Jun 2007, Christoph Lameter wrote:
> On Fri, 22 Jun 2007, Hugh Dickins wrote:
> 
> > However... what gives you confidence that flush_dcache_page is
> > never applied to other slab pages?
> 
> Flush dcache page is supposed to run on pages not objects of varying 
> length. It is suprising that this has not lead to earlier problems.
> Objects allocated this way may straddle a page boundary under some 
> conditions and in that case virt_to_page may not lead to a page that 
> covers the complete object that is supposed to be flushed. Hopefully the 
> "size" of the allocated object were whole pages.

No, that's the wrong way round.  Neither ARM nor PA-RISC expects
flush_dcache_page to flush any dcache when given a slab allocation:
they just expect it to pass through, not to oops.

Hugh
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