linux-kernel - [PATCH 1/1] doc: atomic-ops.txt: correct return value info about atomic_add

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Date:	Thu, 26 Jun 2014 11:00:49 -0700
From:	Pranith Kumar <bobby.prani@...il.com>
To:	trivial@...nel.org, jkosina@...e.cz,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-doc@...r.kernel.org (open list:DOCUMENTATION),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/1] doc: atomic-ops.txt: correct return value info about atomic_add_unless

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 Documentation/atomic_ops.txt | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt
index 68542fe..d3ad657 100644
--- a/Documentation/atomic_ops.txt
+++ b/Documentation/atomic_ops.txt
@@ -271,16 +271,13 @@ Finally:
 
 	int atomic_add_unless(atomic_t *v, int a, int u);
 
-If the atomic value v is not equal to u, this function adds a to v, and
-returns non zero. If v is equal to u then it returns zero. This is done as
-an atomic operation.
+If the atomic value v is not equal to u, this function adds a to v.
+It returns the old value of v. It is done as an atomic operation.
 
-atomic_add_unless requires explicit memory barriers around the operation
-unless it fails (returns 0).
+atomic_add_unless requires explicit memory barriers around the operation.
 
 atomic_inc_not_zero, equivalent to atomic_add_unless(v, 1, 0)
 
-
 If a caller requires memory barrier semantics around an atomic_t
 operation which does not return a value, a set of interfaces are
 defined which accomplish this:
-- 
1.9.1

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