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context_tracking: Wrap static key check into more intuitive function name

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

4
include/linux/context_tracking_state.h
View file

@ -22,6 +22,10 @@ struct context_tracking {
extern struct static_key context_tracking_enabled; extern struct static_key context_tracking_enabled;
DECLARE_PER_CPU(struct context_tracking, context_tracking); 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) static inline bool context_tracking_in_user(void)
{ {
return __this_cpu_read(context_tracking.state) == IN_USER; 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) static inline bool tick_nohz_full_enabled(void)
{ {
if (!static_key_false(&context_tracking_enabled)) if (!context_tracking_is_enabled())
return false; return false;
return tick_nohz_full_running; 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 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
static inline bool vtime_accounting_enabled(void) static inline bool vtime_accounting_enabled(void)
{ {
if (static_key_false(&context_tracking_enabled)) { if (context_tracking_is_enabled()) {
if (context_tracking_active()) if (context_tracking_active())
return true; 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 * 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 * 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 * go further. Repeat the check here until they support the inline static
* check. * key check.
*/ */
if (!static_key_false(&context_tracking_enabled)) if (!context_tracking_is_enabled())
return; return;
/* /*
@ -160,7 +160,7 @@ void context_tracking_user_exit(void)
{ {
unsigned long flags; unsigned long flags;
if (!static_key_false(&context_tracking_enabled)) if (!context_tracking_is_enabled())
return; return;
if (in_interrupt()) if (in_interrupt())