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context_tracking: Wrap static key check into more intuitive function name 

Use a function with a meaningful name to check the global context
tracking state. static_key_false() is a bit confusing for reviewers.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Frederic Weisbecker 2013-11-06 14:45:57 +01:00
parent 99c8b1ea09
commit 58135f574f
5 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/context_tracking.h
View File

@ -17,13 +17,13 @@ extern void __context_tracking_task_switch(struct task_struct *prev,
static inline void user_enter(void)
{
if (static_key_false(&context_tracking_enabled))
if (context_tracking_is_enabled())
context_tracking_user_enter();
}
static inline void user_exit(void)
{
if (static_key_false(&context_tracking_enabled))
if (context_tracking_is_enabled())
context_tracking_user_exit();
}
@ -31,7 +31,7 @@ static inline enum ctx_state exception_enter(void)
{
enum ctx_state prev_ctx;
if (!static_key_false(&context_tracking_enabled))
if (!context_tracking_is_enabled())
return 0;
prev_ctx = this_cpu_read(context_tracking.state);
@ -42,7 +42,7 @@ static inline enum ctx_state exception_enter(void)
static inline void exception_exit(enum ctx_state prev_ctx)
{
if (static_key_false(&context_tracking_enabled)) {
if (context_tracking_is_enabled()) {
if (prev_ctx == IN_USER)
context_tracking_user_enter();
}
@ -51,7 +51,7 @@ static inline void exception_exit(enum ctx_state prev_ctx)
static inline void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next)
{
if (static_key_false(&context_tracking_enabled))
if (context_tracking_is_enabled())
__context_tracking_task_switch(prev, next);
}
#else

4
include/linux/context_tracking_state.h
View File

@ -22,6 +22,10 @@ struct context_tracking {
extern struct static_key context_tracking_enabled;
DECLARE_PER_CPU(struct context_tracking, context_tracking);
static inline bool context_tracking_is_enabled(void)
{
return static_key_false(&context_tracking_enabled);
}
static inline bool context_tracking_in_user(void)
{
return __this_cpu_read(context_tracking.state) == IN_USER;

2
include/linux/tick.h
View File

@ -165,7 +165,7 @@ extern cpumask_var_t tick_nohz_full_mask;
static inline bool tick_nohz_full_enabled(void)
{
if (!static_key_false(&context_tracking_enabled))
if (!context_tracking_is_enabled())
return false;
return tick_nohz_full_running;

2
include/linux/vtime.h
View File

@ -19,7 +19,7 @@ static inline bool vtime_accounting_enabled(void) { return true; }
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
static inline bool vtime_accounting_enabled(void)
{
if (static_key_false(&context_tracking_enabled)) {
if (context_tracking_is_enabled()) {
if (context_tracking_active())
return true;
}

8
kernel/context_tracking.c
View File

@ -53,10 +53,10 @@ void context_tracking_user_enter(void)
/*
* Repeat the user_enter() check here because some archs may be calling
* this from asm and if no CPU needs context tracking, they shouldn't
* go further. Repeat the check here until they support the static key
* check.
* go further. Repeat the check here until they support the inline static
* key check.
*/
if (!static_key_false(&context_tracking_enabled))
if (!context_tracking_is_enabled())
return;
/*
@ -160,7 +160,7 @@ void context_tracking_user_exit(void)
{
unsigned long flags;
if (!static_key_false(&context_tracking_enabled))
if (!context_tracking_is_enabled())
return;
if (in_interrupt())