Eric Dumazet 6ffe75eb53 net: avoid two atomic operations in fast clones ... Commit ce1a4ea3f1 ("net: avoid one atomic operation in skb_clone()") took the wrong way to save one atomic operation. It is actually possible to avoid two atomic operations, if we do not change skb->fclone values, and only rely on clone_ref content to signal if the clone is available or not. skb_clone() can simply use the fast clone if clone_ref is 1. kfree_skbmem() can avoid the atomic_dec_and_test() if clone_ref is 1. Note that because we usually free the clone before the original skb, this particular attempt is only done for the original skb to have better branch prediction. SKB_FCLONE_FREE is removed. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Chris Mason <clm@fb.com> Cc: Sabrina Dubroca <sd@queasysnail.net> Cc: Vijay Subramanian <subramanian.vijay@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-12-09 13:40:20 -05:00
..
acpi	ACPI and power management updates for 3.18-rc2	2014-10-24 11:29:31 -07:00
asm-generic	Revert "fast_hash: avoid indirect function calls"	2014-11-14 16:36:25 -05:00
clocksource
crypto	crypto: LLVMLinux: Add macro to remove use of VLAIS in crypto code	2014-10-14 10:51:22 +02:00
drm	drm/radeon: remove invalid pci id	2014-10-28 10:44:36 -04:00
dt-bindings	The fixes for the clock framework are all regressions in drivers, plus a	2014-11-25 17:52:56 -08:00
keys
kvm	arm/arm64: KVM: Fix BE accesses to GICv2 EISR and ELRSR regs	2014-10-16 10:57:41 +02:00
linux	net: avoid two atomic operations in fast clones	2014-12-09 13:40:20 -05:00
math-emu
media
memory
misc
net	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next	2014-12-08 21:30:21 -05:00
pcmcia
ras
rdma
rxrpc
scsi	scsi: set REQ_QUEUE for the blk-mq case	2014-10-28 09:53:43 +01:00
soc/tegra
sound	ALSA: pcm: Add big-endian DSD sample formats and fix XMOS DSD sample format	2014-11-21 15:13:28 +01:00
target
trace	Merge branch 'urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/urgent	2014-10-30 07:37:37 +01:00
uapi	tc_act: export uapi header file	2014-12-09 13:34:10 -05:00
video	fbdev changes for 3.18	2014-10-18 18:03:02 -07:00
xen
Kbuild