Author: hselasky
Date: Mon May 23 16:19:51 2016
New Revision: 300517
URL: https://svnweb.freebsd.org/changeset/base/300517
Log:
Implement "atomic_long_add_unless()" in the LinuxKPI and fix the
implementation of "atomic_long_inc_not_zero()".
Found by: ngie @
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/asm/atomic-long.h
Modified: head/sys/compat/linuxkpi/common/include/asm/atomic-long.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/asm/atomic-long.h Mon May 23
16:12:11 2016 (r300516)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic-long.h Mon May 23
16:19:51 2016 (r300517)
@@ -41,7 +41,7 @@ typedef struct {
#define atomic_long_add(i, v) atomic_long_add_return((i), (v))
#define atomic_long_inc_return(v) atomic_long_add_return(1, (v))
-#define atomic_long_inc_not_zero(v) atomic_long_inc_not_zero(v)
+#define atomic_long_inc_not_zero(v) atomic_long_add_unless((v), 1,
0)
static inline long
atomic_long_add_return(long i, atomic_long_t *v)
@@ -73,6 +73,21 @@ atomic_long_dec(atomic_long_t *v)
return atomic_fetchadd_long(&v->counter, -1) - 1;
}
+static inline int
+atomic_long_add_unless(atomic_long_t *v, long a, long u)
+{
+ long c;
+
+ for (;;) {
+ c = atomic_long_read(v);
+ if (unlikely(c == u))
+ break;
+ if (likely(atomic_cmpset_long(&v->counter, c, c + a)))
+ break;
+ }
+ return (c != u);
+}
+
static inline long
atomic_long_dec_and_test(atomic_long_t *v)
{
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