linux-kernel - [PATCH 1/6] dax: Use vmf->gfp

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Message-Id: <1454242795-18038-2-git-send-email-matthew.r.wilcox@intel.com>
Date:	Sun, 31 Jan 2016 23:19:50 +1100
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>, linux-mm@...ck.org,
	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, willy@...ux.intel.com
Subject: [PATCH 1/6] dax: Use vmf->gfp_mask

We were assuming that it was OK to do a GFP_KERNEL allocation in page
fault context.  That appears to be largely true, but filesystems are
permitted to override that in their setting of mapping->gfp_flags, which
the VM then massages into vmf->gfp_flags.  No practical difference for
now, but there may come a day when we would have surprised a filesystem.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
---
 fs/dax.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 2f9bb89..11be8c7 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -292,7 +292,7 @@ static int dax_load_hole(struct address_space *mapping, struct page *page,
 	struct inode *inode = mapping->host;
 	if (!page)
 		page = find_or_create_page(mapping, vmf->pgoff,
-						GFP_KERNEL | __GFP_ZERO);
+						vmf->gfp_mask | __GFP_ZERO);
 	if (!page)
 		return VM_FAULT_OOM;
 	/* Recheck i_size under page lock to avoid truncate race */
-- 
2.7.0.rc3