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authorTejun Heo <tj@kernel.org>2014-06-28 08:10:12 -0400
committerTejun Heo <tj@kernel.org>2014-06-28 08:10:12 -0400
commitd630dc4c9adb41e5bd1e06df2dbeaf622469ddd5 (patch)
tree4dc8afb3469f6bb27f3737b48d398ea4fa10e3e6 /include/linux/percpu-refcount.h
parent55c6c814ae0aa896781d3c51e4608de542624f64 (diff)
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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 'include/linux/percpu-refcount.h')
-rw-r--r--include/linux/percpu-refcount.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 5d8920e..bfdeb0d4 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -88,12 +88,10 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
return percpu_ref_kill_and_confirm(ref, NULL);
}
-#define PCPU_STATUS_BITS 2
-#define PCPU_STATUS_MASK ((1 << PCPU_STATUS_BITS) - 1)
#define PCPU_REF_PTR 0
#define PCPU_REF_DEAD 1
-#define REF_STATUS(count) (((unsigned long) count) & PCPU_STATUS_MASK)
+#define REF_STATUS(count) (((unsigned long) count) & PCPU_REF_DEAD)
/**
* percpu_ref_get - increment a percpu refcount
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