3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <[email protected]>

[ Upstream commit 87151b8689d890dfb495081f7be9b9e257f7a2df ]

Marc Merlin reported many order-1 allocations failures in TX path on its
wireless setup, that dont make any sense with MTU=1500 network, and non
SG capable hardware.

Turns out part of the problem comes from pskb_expand_head() not using
ksize() to get exact head size given by kmalloc(). Doing the same thing
than __alloc_skb() allows more tailroom in skb and can prevent future
reallocations.

As a bonus, struct skb_shared_info becomes cache line aligned.

Reported-by: Marc MERLIN <[email protected]>
Tested-by: Marc MERLIN <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
---
 net/core/skbuff.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 29cb392..2ec200de 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -903,9 +903,11 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int 
ntail,
                goto adjust_others;
        }
 
-       data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
+       data = kmalloc(size + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
+                      gfp_mask);
        if (!data)
                goto nodata;
+       size = SKB_WITH_OVERHEAD(ksize(data));
 
        /* Copy only real data... and, alas, header. This should be
         * optimized for the cases when header is void.
-- 
1.7.10



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