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| author | David S. Miller <davem@davemloft.net> | 2013-10-02 01:06:14 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-02 01:06:14 +0400 |
| commit | 4fbef95af4e62d4aada6c1728e04d3b1c828abe0 (patch) | |
| tree | 19cb25e39583119c98dee7114aada6a3b57d18a9 /lib/lockref.c | |
| parent | 5229432f15e6f1b1e34e519e51d07917dee8790e (diff) | |
| parent | c31eeaced22ce8bd61268a3c595d542bb38c0a4f (diff) | |
| download | linux-4fbef95af4e62d4aada6c1728e04d3b1c828abe0.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
drivers/net/ethernet/emulex/benet/be.h
drivers/net/usb/qmi_wwan.c
drivers/net/wireless/brcm80211/brcmfmac/dhd_bus.h
include/net/netfilter/nf_conntrack_synproxy.h
include/net/secure_seq.h
The conflicts are of two varieties:
1) Conflicts with Joe Perches's 'extern' removal from header file
function declarations. Usually it's an argument signature change
or a function being added/removed. The resolutions are trivial.
2) Some overlapping changes in qmi_wwan.c and be.h, one commit adds
a new value, another changes an existing value. That sort of
thing.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/lockref.c')
| -rw-r--r-- | lib/lockref.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/lib/lockref.c b/lib/lockref.c index e2cd2c0a8821..6f9d434c1521 100644 --- a/lib/lockref.c +++ b/lib/lockref.c @@ -4,6 +4,22 @@ #ifdef CONFIG_CMPXCHG_LOCKREF /* + * Allow weakly-ordered memory architectures to provide barrier-less + * cmpxchg semantics for lockref updates. + */ +#ifndef cmpxchg64_relaxed +# define cmpxchg64_relaxed cmpxchg64 +#endif + +/* + * Allow architectures to override the default cpu_relax() within CMPXCHG_LOOP. + * This is useful for architectures with an expensive cpu_relax(). + */ +#ifndef arch_mutex_cpu_relax +# define arch_mutex_cpu_relax() cpu_relax() +#endif + +/* * Note that the "cmpxchg()" reloads the "old" value for the * failure case. */ @@ -14,12 +30,13 @@ while (likely(arch_spin_value_unlocked(old.lock.rlock.raw_lock))) { \ struct lockref new = old, prev = old; \ CODE \ - old.lock_count = cmpxchg(&lockref->lock_count, \ - old.lock_count, new.lock_count); \ + old.lock_count = cmpxchg64_relaxed(&lockref->lock_count, \ + old.lock_count, \ + new.lock_count); \ if (likely(old.lock_count == prev.lock_count)) { \ SUCCESS; \ } \ - cpu_relax(); \ + arch_mutex_cpu_relax(); \ } \ } while (0) |