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context_tracking: remove duplicate enabled check

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All calls to context_tracking_enter and context_tracking_exit
are already checking context_tracking_is_enabled, except the
context_tracking_user_enter and context_tracking_user_exit
functions left in for the benefit of assembly calls.

Pull the check up to those functions, by making them simple
wrappers around the user_enter and user_exit inline functions.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Tested-by: Rik van Riel <riel@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-10-28 02:39:55 +01:00
parent 8cfe986696
commit f70cd6b07e
2 changed files with 4 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/context_tracking.h
View file

@ -18,13 +18,13 @@ extern void context_tracking_user_exit(void);
static inline void user_enter(void) static inline void user_enter(void)
{ {
if (context_tracking_is_enabled()) if (context_tracking_is_enabled())
context_tracking_user_enter(); context_tracking_enter(CONTEXT_USER);
} }
static inline void user_exit(void) static inline void user_exit(void)
{ {
if (context_tracking_is_enabled()) if (context_tracking_is_enabled())
context_tracking_user_exit(); context_tracking_exit(CONTEXT_USER);
} }
static inline enum ctx_state exception_enter(void) static inline enum ctx_state exception_enter(void)

16
kernel/context_tracking.c
View file

@ -62,15 +62,6 @@ void context_tracking_enter(enum ctx_state state)
{ {
unsigned long flags; unsigned long flags;
/*
* 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 inline static
* key check.
*/
if (!context_tracking_is_enabled())
return;
/* /*
* Some contexts may involve an exception occuring in an irq, * Some contexts may involve an exception occuring in an irq,
* leading to that nesting: * leading to that nesting:
@ -128,7 +119,7 @@ EXPORT_SYMBOL_GPL(context_tracking_enter);
void context_tracking_user_enter(void) void context_tracking_user_enter(void)
{ {
context_tracking_enter(CONTEXT_USER); user_enter();
} }
NOKPROBE_SYMBOL(context_tracking_user_enter); NOKPROBE_SYMBOL(context_tracking_user_enter);
@ -148,9 +139,6 @@ void context_tracking_exit(enum ctx_state state)
{ {
unsigned long flags; unsigned long flags;
if (!context_tracking_is_enabled())
return;
if (in_interrupt()) if (in_interrupt())
return; return;
@ -181,7 +169,7 @@ EXPORT_SYMBOL_GPL(context_tracking_exit);
void context_tracking_user_exit(void) void context_tracking_user_exit(void)
{ {
context_tracking_exit(CONTEXT_USER); user_exit();
} }
NOKPROBE_SYMBOL(context_tracking_user_exit); NOKPROBE_SYMBOL(context_tracking_user_exit);