Author: hselasky
Date: Wed Jun 6 13:59:51 2018
New Revision: 334712
URL: https://svnweb.freebsd.org/changeset/base/334712
Log:
Implement the atomic_dec_if_positive() function in the LinuxKPI.
Submitted by: Johannes Lundberg <johal...@gmail.com>
MFC after: 1 week
Sponsored by: Mellanox Technologies
Sponsored by: Limelight Networks
Modified:
head/sys/compat/linuxkpi/common/include/asm/atomic.h
Modified: head/sys/compat/linuxkpi/common/include/asm/atomic.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/asm/atomic.h Wed Jun 6
13:37:31 2018 (r334711)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic.h Wed Jun 6
13:59:51 2018 (r334712)
@@ -235,6 +235,22 @@ atomic_cmpxchg(atomic_t *v, int old, int new)
__ret.val; \
})
+static inline int
+atomic_dec_if_positive(atomic_t *v)
+{
+ int retval;
+ int curr;
+
+ do {
+ curr = atomic_read(v);
+ retval = curr - 1;
+ if (unlikely(retval < 0))
+ break;
+ } while (!likely(atomic_cmpset_int(&v->counter, curr, retval)));
+
+ return (retval);
+}
+
#define LINUX_ATOMIC_OP(op, c_op) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
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