On Thu, 16 Mar 2017 09:41:10 -0700 Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
> > Andi, why did you completely remove __arch_atomic_add_unless() from
> > the header? Don't we need at least a declaration there?
>
> Actually it's there in my git version:
>
> I wonder where it disappeared.
>
> -/**
> - * __atomic_add_unless - add unless the number is already a given value
> - * @v: pointer of type atomic_t
> - * @a: the amount to add to v...
> - * @u: ...unless v is equal to u.
> - *
> - * Atomically adds @a to @v, so long as @v was not already @u.
> - * Returns the old value of @v.
> - */
> -static __always_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;
> -}
> +int __atomic_add_unless(atomic_t *v, int a, int u);
That was me fixing rejects (from
asm-generic-x86-wrap-atomic-operations.patch), incompletely.
--- a/arch/x86/include/asm/atomic.h~x86-atomic-move-__atomic_add_unless-out-of-line-fix
+++ a/arch/x86/include/asm/atomic.h
@@ -235,6 +235,8 @@ ATOMIC_OPS(xor, ^)
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP
+int __arch_atomic_add_unless(atomic_t *v, int a, int u);
+
/**
* arch_atomic_inc_short - increment of a short integer
* @v: pointer to type int
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