Eric Dumazet 404e0a8b6a net: ipv4: fix RCU races on dst refcounts ... commit c6cffba4ff (ipv4: Fix input route performance regression.) added various fatal races with dst refcounts. crashes happen on tcp workloads if routes are added/deleted at the same time. The dst_free() calls from free_fib_info_rcu() are clearly racy. We need instead regular dst refcounting (dst_release()) and make sure dst_release() is aware of RCU grace periods : Add DST_RCU_FREE flag so that dst_release() respects an RCU grace period before dst destruction for cached dst Introduce a new inet_sk_rx_dst_set() helper, using atomic_inc_not_zero() to make sure we dont increase a zero refcount (On a dst currently waiting an rcu grace period before destruction) rt_cache_route() must take a reference on the new cached route, and release it if was not able to install it. With this patch, my machines survive various benchmarks. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2012-07-30 14:53:22 -07:00
..
acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-07-26 14:28:55 -07:00
asm-generic	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	2012-07-27 15:14:26 -07:00
crypto
drm	Merge branch 'drm-nouveau-fixes' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next	2012-07-26 10:35:44 +10:00
keys
linux	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	2012-07-27 15:14:26 -07:00
math-emu
media
memory
misc
mtd
net	net: ipv4: fix RCU races on dst refcounts	2012-07-30 14:53:22 -07:00
pcmcia
rdma	Merge branches 'cma', 'cxgb4', 'misc', 'mlx4-sriov', 'mlx-cleanups', 'ocrdma' and 'qib' into for-linus	2012-07-22 23:26:17 -07:00
rxrpc
scsi	Merge branch 'master' [vanilla Linus master] into libata-dev.git/upstream	2012-07-25 15:58:48 -04:00
sound	Merge branch 'topic/pm-convert' into for-next	2012-07-19 08:21:57 +02:00
target	target: Allow for target_submit_cmd() returning errors	2012-07-17 17:05:05 -07:00
trace	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-07-26 13:17:17 -07:00
video
xen	xen PVonHVM: move shared_info to MMIO before kexec	2012-07-19 15:52:05 -04:00
Kbuild