summaryrefslogtreecommitdiffstats
path: root/include/asm-frv/atomic.h
diff options
context:
space:
mode:
authorMathieu Desnoyers <compudj@krystal.dyndns.org>2007-05-08 00:34:38 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:20 -0700
commit2856f5e31c1413bf6e4f1371e07e17078a5fee5e (patch)
tree587dfe584f0913813d0cf2414a9378618143db15 /include/asm-frv/atomic.h
parent79d365a306c3af53d8a732fec79b76c0b285d816 (diff)
downloadop-kernel-dev-2856f5e31c1413bf6e4f1371e07e17078a5fee5e.zip
op-kernel-dev-2856f5e31c1413bf6e4f1371e07e17078a5fee5e.tar.gz
atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency
atomic_add_unless as inline. Remove system.h atomic.h circular dependency. I agree (with Andi Kleen) this typeof is not needed and more error prone. All the original atomic.h code that uses cmpxchg (which includes the atomic_add_unless) uses defines instead of inline functions, probably to circumvent a circular dependency between system.h and atomic.h on powerpc (which my patch addresses). Therefore, it makes sense to use inline functions that will provide type checking. atomic_add_unless as inline. Remove system.h atomic.h circular dependency. Digging into the FRV architecture shows me that it is also affected by such a circular dependency. Here is the diff applying this against the rest of my atomic.h patches. It applies over the atomic.h standardization patches. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-frv/atomic.h')
-rw-r--r--include/asm-frv/atomic.h91
1 files changed, 15 insertions, 76 deletions
diff --git a/include/asm-frv/atomic.h b/include/asm-frv/atomic.h
index 066386a..d425d8d 100644
--- a/include/asm-frv/atomic.h
+++ b/include/asm-frv/atomic.h
@@ -16,6 +16,7 @@
#include <linux/types.h>
#include <asm/spr-regs.h>
+#include <asm/system.h>
#ifdef CONFIG_SMP
#error not SMP safe
@@ -258,85 +259,23 @@ extern uint32_t __xchg_32(uint32_t i, volatile void *v);
#define tas(ptr) (xchg((ptr), 1))
-/*****************************************************************************/
-/*
- * compare and conditionally exchange value with memory
- * - if (*ptr == test) then orig = *ptr; *ptr = test;
- * - if (*ptr != test) then orig = *ptr;
- */
-#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
-
-#define cmpxchg(ptr, test, new) \
-({ \
- __typeof__(ptr) __xg_ptr = (ptr); \
- __typeof__(*(ptr)) __xg_orig, __xg_tmp; \
- __typeof__(*(ptr)) __xg_test = (test); \
- __typeof__(*(ptr)) __xg_new = (new); \
- \
- switch (sizeof(__xg_orig)) { \
- case 4: \
- asm volatile( \
- "0: \n" \
- " orcc gr0,gr0,gr0,icc3 \n" \
- " ckeq icc3,cc7 \n" \
- " ld.p %M0,%1 \n" \
- " orcr cc7,cc7,cc3 \n" \
- " sub%I4cc %1,%4,%2,icc0 \n" \
- " bne icc0,#0,1f \n" \
- " cst.p %3,%M0 ,cc3,#1 \n" \
- " corcc gr29,gr29,gr0 ,cc3,#1 \n" \
- " beq icc3,#0,0b \n" \
- "1: \n" \
- : "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp) \
- : "r"(__xg_new), "NPr"(__xg_test) \
- : "memory", "cc7", "cc3", "icc3", "icc0" \
- ); \
- break; \
- \
- default: \
- __xg_orig = 0; \
- asm volatile("break"); \
- break; \
- } \
- \
- __xg_orig; \
-})
-
-#else
-
-extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
-
-#define cmpxchg(ptr, test, new) \
-({ \
- __typeof__(ptr) __xg_ptr = (ptr); \
- __typeof__(*(ptr)) __xg_orig; \
- __typeof__(*(ptr)) __xg_test = (test); \
- __typeof__(*(ptr)) __xg_new = (new); \
- \
- switch (sizeof(__xg_orig)) { \
- case 4: __xg_orig = __cmpxchg_32(__xg_ptr, __xg_test, __xg_new); break; \
- default: \
- __xg_orig = 0; \
- asm volatile("break"); \
- break; \
- } \
- \
- __xg_orig; \
-})
-
-#endif
-
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-#define atomic_add_unless(v, a, u) \
-({ \
- int c, old; \
- c = atomic_read(v); \
- while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
- c = old; \
- c != (u); \
-})
+static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+{
+ int c, old;
+ c = atomic_read(v);
+ for (;;) {
+ if (unlikely(c == (u)))
+ break;
+ old = atomic_cmpxchg((v), c, c + (a));
+ if (likely(old == c))
+ break;
+ c = old;
+ }
+ return c != (u);
+}
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
OpenPOWER on IntegriCloud