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

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Date:	Fri, 22 Jun 2007 05:46:42 +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>,
	Matthew Wilcox <matthew@....cx>
Subject: Re: Oops in a driver while using SLUB as a SLAB allocator

On Thu, 21 Jun 2007, Christoph Lameter wrote:
> On Thu, 21 Jun 2007, Hugh Dickins wrote:
> 
> > Seems a little odd that it's gone throughout 2.6.22-rc unnoticed
> > until now - nobody else trying SLUB on ARM or PA-RISC yet perhaps.
> 
> The impact is only on a subset of ARM machines.
> 
> PA_RISC? It looks like they run their own flushing function for byte 
> ranges called flush_kernel_dache_range. That does not use the page struct.

PA-RISC does have a function of that name, and I'm guessing that
you came across it in looking at the PA-RISC dma_map_single.

But PA-RISC also has a function called flush_dcache_page, which uses
page_mapping and expects a struct address_space * from it.  If that
can ever be get applied to a SLOB page (which is not so clear as in
the ARM case, but cannot easily be ruled out completely), we're
in trouble without a PageSlab test within page_mapping.

Hugh
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