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locking/static_keys: Fix up the static keys documentation 

Fix a few small mistakes in the static key documentation and
delete an unneeded sentence.

Suggested-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150914171105.511e1e21@lwn.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jonathan Corbet 2015-09-14 17:11:05 -06:00 committed by Ingo Molnar
parent a6b277857f
commit 1975dbc276
2 changed files with 6 additions and 8 deletions
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4
Documentation/static-keys.txt
View File

@ -15,8 +15,8 @@ The updated API replacements are:
DEFINE_STATIC_KEY_TRUE(key);
DEFINE_STATIC_KEY_FALSE(key);
static_key_likely()
static_key_unlikely()
static_branch_likely()
static_branch_unlikely()
0) Abstract

10
include/linux/jump_label.h
View File

@ -21,8 +21,8 @@
*
* DEFINE_STATIC_KEY_TRUE(key);
* DEFINE_STATIC_KEY_FALSE(key);
* static_key_likely()
* static_key_unlikely()
* static_branch_likely()
* static_branch_unlikely()
*
* Jump labels provide an interface to generate dynamic branches using
* self-modifying code. Assuming toolchain and architecture support, if we
@ -45,12 +45,10 @@
* statement, setting the key to true requires us to patch in a jump
* to the out-of-line of true branch.
*
* In addtion to static_branch_{enable,disable}, we can also reference count
* In addition to static_branch_{enable,disable}, we can also reference count
* the key or branch direction via static_branch_{inc,dec}. Thus,
* static_branch_inc() can be thought of as a 'make more true' and
* static_branch_dec() as a 'make more false'. The inc()/dec()
* interface is meant to be used exclusively from the inc()/dec() for a given
* key.
* static_branch_dec() as a 'make more false'.
*
* Since this relies on modifying code, the branch modifying functions
* must be considered absolute slow paths (machine wide synchronization etc.).