linux-kernel - [Patch v2] skbuff: Hide GFP_ATOMIC page allocation failures for dropped packets

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Message-Id: <1369599557-22677-1-git-send-email-atomlin@redhat.com>
Date:	Sun, 26 May 2013 21:19:17 +0100
From:	atomlin@...hat.com
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, edumazet@...gle.com, pshelar@...ira.com,
	mst@...hat.com, alexander.h.duyck@...el.com, riel@...hat.com,
	aquini@...hat.com, sergei.shtylyov@...entembedded.com,
	linux-kernel@...r.kernel.org, Aaron Tomlin <atomlin@...hat.com>
Subject: [Patch v2] skbuff: Hide GFP_ATOMIC page allocation failures for dropped packets

From: Aaron Tomlin <atomlin@...hat.com>

Since v1:
 - Removed unnecessary parentheses

---8<---

Failed GFP_ATOMIC allocations by the network stack result in dropped
packets, which will be received on a subsequent retransmit, and an
unnecessary, noisy warning with a kernel backtrace.

These warnings are harmless, but they still cause users to panic and
file bug reports over dropped packets. It would be better to hide the
failed allocation warnings and backtraces, and let retransmits handle
dropped packets quietly.

Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
---
 net/core/skbuff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 02139d6..84aa870 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -236,7 +236,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 		? skbuff_fclone_cache : skbuff_head_cache;
 
 	if (sk_memalloc_socks() && (flags & SKB_ALLOC_RX))
-		gfp_mask |= (__GFP_MEMALLOC|__GFP_NOWARN);
+		gfp_mask |= __GFP_MEMALLOC | __GFP_NOWARN;
 
 	/* Get the HEAD */
 	skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);
-- 
1.8.1.4

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