Author: hselasky
Date: Mon Apr 20 16:21:37 2020
New Revision: 360127
URL: https://svnweb.freebsd.org/changeset/base/360127
Log:
Implement the atomic fetch add unless functions for the LinuxKPI.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/asm/atomic-long.h
head/sys/compat/linuxkpi/common/include/asm/atomic.h
head/sys/compat/linuxkpi/common/include/asm/atomic64.h
Modified: head/sys/compat/linuxkpi/common/include/asm/atomic-long.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/asm/atomic-long.h Mon Apr 20
16:17:16 2020 (r360126)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic-long.h Mon Apr 20
16:21:37 2020 (r360127)
@@ -111,6 +111,20 @@ atomic_long_add_unless(atomic_long_t *v, long a, long
}
static inline long
+atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
+{
+ long c = atomic_long_read(v);
+
+ for (;;) {
+ if (unlikely(c == u))
+ break;
+ if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
+ break;
+ }
+ return (c);
+}
+
+static inline long
atomic_long_dec_and_test(atomic_long_t *v)
{
long i = atomic_long_add(-1, v);
Modified: head/sys/compat/linuxkpi/common/include/asm/atomic.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/asm/atomic.h Mon Apr 20
16:17:16 2020 (r360126)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic.h Mon Apr 20
16:21:37 2020 (r360127)
@@ -119,6 +119,20 @@ atomic_add_unless(atomic_t *v, int a, int u)
return (c != u);
}
+static inline int
+atomic_fetch_add_unless(atomic_t *v, int a, int u)
+{
+ int c = atomic_read(v);
+
+ for (;;) {
+ if (unlikely(c == u))
+ break;
+ if (likely(atomic_fcmpset_int(&v->counter, &c, c + a)))
+ break;
+ }
+ return (c);
+}
+
static inline void
atomic_clear_mask(unsigned int mask, atomic_t *v)
{
Modified: head/sys/compat/linuxkpi/common/include/asm/atomic64.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/asm/atomic64.h Mon Apr 20
16:17:16 2020 (r360126)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic64.h Mon Apr 20
16:21:37 2020 (r360127)
@@ -104,6 +104,20 @@ atomic64_add_unless(atomic64_t *v, int64_t a, int64_t
}
static inline int64_t
+atomic64_fetch_add_unless(atomic64_t *v, int64_t a, int64_t u)
+{
+ int64_t c = atomic64_read(v);
+
+ for (;;) {
+ if (unlikely(c == u))
+ break;
+ if (likely(atomic_fcmpset_64(&v->counter, &c, c + a)))
+ break;
+ }
+ return (c);
+}
+
+static inline int64_t
atomic64_xchg(atomic64_t *v, int64_t i)
{
#if !((defined(__mips__) && !(defined(__mips_n32) || defined(__mips_n64))) || \
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