On 07/17/2015 05:40 AM, Will Deacon wrote:
Hi Waiman,
On Fri, Jul 17, 2015 at 01:07:28AM +0100, Waiman Long wrote:
On 07/16/2015 11:32 AM, Will Deacon wrote:
+#ifndef atomic64_add_return_relaxed
+#define atomic64_add_return_relaxed atomic64_add_return
+#define atomic64_add_return_acquire atomic64_add_return
+#define atomic64_add_return_release atomic64_add_return
+
+#else /* atomic64_add_return_relaxed */
+
+#ifndef atomic64_add_return_acquire
+#define atomic64_add_return_acquire(...) \
+ __atomic_op_acquire(long long, atomic64_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_add_return_release
+#define atomic64_add_return_release(...) \
+ __atomic_op_release(long long, atomic64_add_return, __VA_ARGS__)
+#endif
+
+#ifndef atomic64_add_return
+#define atomic64_add_return(...) \
+ __atomic_op_fence(long long, atomic64_add_return, __VA_ARGS__)
+#endif
+#endif /* atomic64_add_return_relaxed */
+
I have a minor nit. The atomic_add_return block is repeated with
"s/atomic_add_return/.../". Perhaps some more comments to delineate the
blocks more visibly will make this patch easier to read.
Yeah, I agree that it's pretty hard going, but I don't have any great
suggestions to solve that. I could add an extra blank line + comment
before the start of each section, if you like? Example snippet below.
Will
--->8
[...]
#endif /* atomic_sub_return_relaxed */
/* atomic_xchg_relaxed */
#ifndef atomic_xchg_relaxed
#define atomic_xchg_relaxed atomic_xchg
#define atomic_xchg_acquire atomic_xchg
#define atomic_xchg_release atomic_xchg
#else /* atomic_xchg_relaxed */
#ifndef atomic_xchg_acquire
#define atomic_xchg_acquire(...) \
__atomic_op_acquire(int, atomic_xchg, __VA_ARGS__)
#endif
#ifndef atomic_xchg_release
#define atomic_xchg_release(...) \
__atomic_op_release(int, atomic_xchg, __VA_ARGS__)
#endif
#ifndef atomic_xchg
#define atomic_xchg(...) \
__atomic_op_fence(int, atomic_xchg, __VA_ARGS__)
#endif
#endif /* atomic_xchg_relaxed */
/* atomic_cmpxchg_relaxed */
[...]
Something like
/* BEGIN atomc_xchg_relax */
...
/* END atomic_xchg_relax */
may help.
Alternatively, I sometimes add a line separator like
/*===================[ atomic_xchg_relax ]====================*/
Cheers,
Longman
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