Le samedi 28 mai 2011 à 20:04 +0200, Ingo Molnar a écrit :

* Eric Dumazet [off-list ref] wrote:

quoted

quoted

+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+	return __atomic_add_unless(v, a, u) != u;
 }
 
 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

As I said, atomic_add_unless() has several implementations in 
various arches. You must take care of all, not only x86.

It's a bit sad to see local hacks to generic facilities committed 
upstream like that.

Again, its a stable candidate patch, on a file that had many changes in
recent kernels.

I felt this was the right thing to do, to ease stable teams work.

Its not like there is an urgent need for this atomic_add_unless_return()
thing that we have to worry right now.