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| author | jamal <hadi@cyberus.ca> | 2010-02-16 05:01:22 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-17 07:20:24 +0300 |
| commit | 6836b9bdd98e3b500cd49512484df68f46e14659 (patch) | |
| tree | 39eb8e910213e71ab707ad5d3e0b1606fa844f54 /net/xfrm | |
| parent | e06d41d09f314a1664ad60e46934b0ac131c6fa2 (diff) | |
| download | linux-6836b9bdd98e3b500cd49512484df68f46e14659.tar.xz | |
xfrm: avoid spinlock in get_acqseq() used by xfrm user
Eric's version fixed it for pfkey. This one is for xfrm user.
I thought about amortizing those two get_acqseq()s but it seems
reasonable to have two of these sequence spaces for the two different
interfaces.
cheers,
jamal
commit d5168d5addbc999c94aacda8f28a4a173756a72b
Author: Jamal Hadi Salim <hadi@cyberus.ca>
Date: Tue Feb 16 06:51:22 2010 -0500
xfrm: avoid spinlock in get_acqseq() used by xfrm user
This is in the same spirit as commit 28aecb9d7728dc26bf03ce7925fe622023a83a2a
by Eric Dumazet.
Use atomic_inc_return() in get_acqseq() to avoid taking a spinlock
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_state.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index f50ee9badf47..96f2088e7448 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1462,12 +1462,12 @@ EXPORT_SYMBOL(xfrm_find_acq_byseq); u32 xfrm_get_acqseq(void) { u32 res; - static u32 acqseq; - static DEFINE_SPINLOCK(acqseq_lock); + static atomic_t acqseq; + + do { + res = atomic_inc_return(&acqseq); + } while (!res); - spin_lock_bh(&acqseq_lock); - res = (++acqseq ? : ++acqseq); - spin_unlock_bh(&acqseq_lock); return res; } EXPORT_SYMBOL(xfrm_get_acqseq); |