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jump_labels: Allow array initialisers

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The static key API is currently designed around single variable
definitions. There are cases where an array of static keys is desirable,
so extend the API to allow this rather than using the internal static
key implementation directly.

Cc: Jason Baron <jbaron@akamai.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Suggested-by: Dave P Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Catalin Marinas 2016-09-05 18:25:47 +01:00 committed by Will Deacon
parent dae8c235d9
commit ef0da55a84
2 changed files with 21 additions and 0 deletions
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9
Documentation/static-keys.txt
View File

@ -15,6 +15,8 @@ The updated API replacements are:
DEFINE_STATIC_KEY_TRUE(key);
DEFINE_STATIC_KEY_FALSE(key);
DEFINE_STATIC_KEY_ARRAY_TRUE(keys, count);
DEFINE_STATIC_KEY_ARRAY_FALSE(keys, count);
static_branch_likely()
static_branch_unlikely()
@ -140,6 +142,13 @@ static_branch_inc(), will change the branch back to true. Likewise, if the
key is initialized false, a 'static_branch_inc()', will change the branch to
true. And then a 'static_branch_dec()', will again make the branch false.
Where an array of keys is required, it can be defined as:
DEFINE_STATIC_KEY_ARRAY_TRUE(keys, count);
or:
DEFINE_STATIC_KEY_ARRAY_FALSE(keys, count);
4) Architecture level code patching interface, 'jump labels'

12
include/linux/jump_label.h
View File

@ -21,6 +21,8 @@
*
* DEFINE_STATIC_KEY_TRUE(key);
* DEFINE_STATIC_KEY_FALSE(key);
* DEFINE_STATIC_KEY_ARRAY_TRUE(keys, count);
* DEFINE_STATIC_KEY_ARRAY_FALSE(keys, count);
* static_branch_likely()
* static_branch_unlikely()
*
@ -270,6 +272,16 @@ struct static_key_false {
#define DEFINE_STATIC_KEY_FALSE(name) \
struct static_key_false name = STATIC_KEY_FALSE_INIT
#define DEFINE_STATIC_KEY_ARRAY_TRUE(name, count) \
struct static_key_true name[count] = { \
[0 ... (count) - 1] = STATIC_KEY_TRUE_INIT, \
}
#define DEFINE_STATIC_KEY_ARRAY_FALSE(name, count) \
struct static_key_false name[count] = { \
[0 ... (count) - 1] = STATIC_KEY_FALSE_INIT, \
}
extern bool ____wrong_branch_error(void);
#define static_key_enabled(x) \