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| author | Tejun Heo <tj@kernel.org> | 2014-06-28 08:10:12 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-06-28 08:10:12 -0400 |
| commit | d630dc4c9adb41e5bd1e06df2dbeaf622469ddd5 (patch) | |
| tree | 4dc8afb3469f6bb27f3737b48d398ea4fa10e3e6 /lib | |
| parent | 55c6c814ae0aa896781d3c51e4608de542624f64 (diff) | |
| download | op-kernel-dev-d630dc4c9adb41e5bd1e06df2dbeaf622469ddd5.zip op-kernel-dev-d630dc4c9adb41e5bd1e06df2dbeaf622469ddd5.tar.gz | |
percpu-refcount: one bit is enough for REF_STATUS
percpu-refcount currently reserves two lowest bits of its percpu
pointer to indicate its state; however, only one bit is used for
PCPU_REF_DEAD.
Simplify it by removing PCPU_STATUS_BITS/MASK and testing
PCPU_REF_DEAD directly. This also allows the compiler to choose a
more efficient instruction depending on the architecture.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/percpu-refcount.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index 963b703..17bce2b 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -96,7 +96,7 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu) /* Mask out PCPU_REF_DEAD */ pcpu_count = (unsigned __percpu *) - (((unsigned long) pcpu_count) & ~PCPU_STATUS_MASK); + (((unsigned long) pcpu_count) & ~PCPU_REF_DEAD); for_each_possible_cpu(cpu) count += *per_cpu_ptr(pcpu_count, cpu); |
