From 1513b39a8c8e21e3f8fbebab9fb4c41040ccf695 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Mon, 27 Oct 2014 18:14:39 +0000 Subject: kernel: start working on 3.18 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This commit: 1) Copies 3.14 patches 2) Drops mainlined stuff 3) Modifies some patches to apply Signed-off-by: Rafał Miłecki SVN-Revision: 43093 --- .../656-skb_reduce_truesize-helper.patch | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 target/linux/generic/patches-3.18/656-skb_reduce_truesize-helper.patch (limited to 'target/linux/generic/patches-3.18/656-skb_reduce_truesize-helper.patch') diff --git a/target/linux/generic/patches-3.18/656-skb_reduce_truesize-helper.patch b/target/linux/generic/patches-3.18/656-skb_reduce_truesize-helper.patch new file mode 100644 index 0000000000..6471a853cc --- /dev/null +++ b/target/linux/generic/patches-3.18/656-skb_reduce_truesize-helper.patch @@ -0,0 +1,41 @@ +From 4593a806e31119c5bd3faa00c7210ad862d515af Mon Sep 17 00:00:00 2001 +From: Dave Taht +Date: Mon, 31 Dec 2012 10:02:21 -0800 +Subject: [PATCH 3/7] skb_reduce_truesize: helper function for shrinking skbs + whenever needed + +On embedded devices in particular, large queues of small packets from the rx +path with a large truesize can exist. Reducing their size can reduce +memory pressure. skb_reduce_truesize is a helper function for doing this, +when needed. +--- + include/linux/skbuff.h | 18 ++++++++++++++++++ + 1 file changed, 18 insertions(+) + +--- a/include/linux/skbuff.h ++++ b/include/linux/skbuff.h +@@ -2059,6 +2059,24 @@ static inline void pskb_trim_unique(stru + BUG_ON(err); + } + ++/* ++ * Caller wants to reduce memory needs before queueing skb ++ * The (expensive) copy should not be be done in fast path. ++ */ ++static inline struct sk_buff *skb_reduce_truesize(struct sk_buff *skb) ++{ ++ if (skb->truesize > 2 * SKB_TRUESIZE(skb->len)) { ++ struct sk_buff *nskb; ++ nskb = skb_copy_expand(skb, skb_headroom(skb), 0, ++ GFP_ATOMIC | __GFP_NOWARN); ++ if (nskb) { ++ __kfree_skb(skb); ++ skb = nskb; ++ } ++ } ++ return skb; ++} ++ + /** + * skb_orphan - orphan a buffer + * @skb: buffer to orphan -- cgit v1.2.3