lkml.org 
[lkml]   [2015]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/5] atomics: add acquire/release/relaxed variants of some atomic operations
On Tue, Jul 14, 2015 at 12:31:47PM +0100, Will Deacon wrote:
> #ifndef atomic_add
> #define atomic_add(args...) (void)atomic_add_return_relaxed(args);
>
> It would mean a new architecture only has to define a barrier instruction
> and a handful of relaxed atomics for a bare-minimum atomic.h avoiding
> spinlocks.

Look at include/asm-generic/atomic.h, all you need is a cmpxchg().

We could easily change that to be cmpxchg_relaxed() and a few barriers.




\
 
 \ /
  Last update: 2015-07-14 14:01    [W:0.258 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site