linux-kernel - Re: [PATCH] mm: add gfp_mask parameter to vm_map

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Date:	Thu, 14 Jun 2012 12:15:47 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Dave Chinner <dchinner@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	xfs@....sgi.com
Subject: Re: [PATCH] mm: add gfp_mask parameter to vm_map_ram()

On Thu, Jun 14, 2012 at 09:49:02AM +0800, Fengguang Wu wrote:
> On Thu, Jun 14, 2012 at 11:20:26AM +1000, Dave Chinner wrote:
> > 
> > Bug in vm_map_ram - it does an unconditional GFP_KERNEL allocation
> > here, and we are in a GFP_NOFS context. We can't pass a gfp_mask to
> > vm_map_ram(), so until vm_map_ram() grows that we can't fix it...
> 
> This trivial patch should fix it.
> 
> The only behavior change is the XFS part:
> 
> @@ -406,7 +406,7 @@ _xfs_buf_map_pages(
>  
>                 do {
>                         bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
> -                                               -1, PAGE_KERNEL);
> +                                               -1, GFP_NOFS, PAGE_KERNEL);

This function isn't always called in GFP_NOFS context - readahead
uses different memory allocation semantics (no retry, no warn), so
there are flags that tell it what to do. i.e.

-						-1, PAGE_KERNEL);
+						-1, xb_to_gfp(flags), PAGE_KERNEL);

Otherwise looks fine to me...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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