linux-kernel - Re: [RFC] propagate gfp_t to page table alloc functions

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Message-ID: <4F963742.2030607@jp.fujitsu.com>
Date:	Tue, 24 Apr 2012 14:16:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC] propagate gfp_t to page table alloc functions

(2012/04/23 17:55), Minchan Kim wrote:

> As I test some code, I found a problem about deadlock by lockdep.
> The reason I saw the message is __vmalloc calls map_vm_area which calls
> pud/pmd_alloc without gfp_t. so although we call __vmalloc with
> GFP_ATOMIC or GFP_NOIO, it ends up allocating pages with GFP_KERNEL.
> The should be a BUG. This patch fixes it by passing gfp_to to low page
> table allocate functions.
> 
> Signed-off-by: Minchan Kim <minchan@...nel.org>


Hmm ? vmalloc should support GFP_ATOMIC ?

And, do we need to change all pud_,pgd_,pmd_,pte_alloc() for users pgtables ?

Thanks,
-Kame

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