GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-19 13:11:14 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

sched: Introduce preempt_count accessor functions

Browse source 
Replace the single preempt_count() 'function' that's an lvalue with
two proper functions:

 preempt_count() - returns the preempt_count value as rvalue
 preempt_count_set() - Allows setting the preempt-count value

Also provide preempt_count_ptr() as a convenience wrapper to implement
all modifying operations.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-orxrbycjozopqfhb4dxdkdvb@git.kernel.org
[ Fixed build failure. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2013-08-14 14:55:24 +02:00 • committed by Ingo Molnar
parent ea81174789
commit 4a2b4b2227
7 changed files with 30 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

25
include/linux/preempt.h
View file

@ -10,19 +10,32 @@
#include <linux/linkage.h>
#include <linux/list.h>
static __always_inline int preempt_count(void)
{
return current_thread_info()->preempt_count;
}
static __always_inline int *preempt_count_ptr(void)
{
return &current_thread_info()->preempt_count;
}
static __always_inline void preempt_count_set(int pc)
{
*preempt_count_ptr() = pc;
}
#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
extern void add_preempt_count(int val);
extern void sub_preempt_count(int val);
#else
# define add_preempt_count(val) do { preempt_count() += (val); } while (0)
# define sub_preempt_count(val) do { preempt_count() -= (val); } while (0)
# define add_preempt_count(val) do { *preempt_count_ptr() += (val); } while (0)
# define sub_preempt_count(val) do { *preempt_count_ptr() -= (val); } while (0)
#endif
#define inc_preempt_count() add_preempt_count(1)
#define dec_preempt_count() sub_preempt_count(1)
#define preempt_count() (current_thread_info()->preempt_count)
#ifdef CONFIG_PREEMPT
asmlinkage void preempt_schedule(void);
@ -81,9 +94,9 @@ do { \
/* For debugging and tracer internals only! */
#define add_preempt_count_notrace(val) \
do { preempt_count() += (val); } while (0)
do { *preempt_count_ptr() += (val); } while (0)
#define sub_preempt_count_notrace(val) \
do { preempt_count() -= (val); } while (0)
do { *preempt_count_ptr() -= (val); } while (0)
#define inc_preempt_count_notrace() add_preempt_count_notrace(1)
#define dec_preempt_count_notrace() sub_preempt_count_notrace(1)