linux-kernel - [PATCH 1/7] Document that bio_alloc with __GFP

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Date:	Wed, 15 Apr 2009 10:35:04 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] Document that bio_alloc with __GFP_WAIT cannot fail

Document that bio_alloc with __GFP_WAIT cannot fail.

Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>

---

diff --git a/fs/bio.c b/fs/bio.c
index e0c9e54..5b5dfdd 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -348,6 +348,10 @@ err:
 	return NULL;
 }
 
+/*
+ * This will not fail as long as __GFP_WAIT is specified
+ * in the gfp_mask, as mempool backing is used.
+ */
 struct bio *bio_alloc(gfp_t gfp_mask, int nr_iovecs)
 {
 	struct bio *bio = bio_alloc_bioset(gfp_mask, nr_iovecs, fs_bio_set);

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