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sched: Add get_current_state()

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Remove yet another few p->state accesses.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210611082838.347475156@infradead.org
This commit is contained in:
Peter Zijlstra 2021-06-11 10:28:14 +02:00
parent 3ba9f93b12
commit d6c23bb3a2
4 changed files with 7 additions and 5 deletions
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2
block/blk-mq.c
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@ -3910,7 +3910,7 @@ int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
hctx->poll_considered++;
state = current->state;
state = get_current_state();
do {
int ret;

2
include/linux/sched.h
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@ -213,6 +213,8 @@ struct task_group;
#endif
#define get_current_state() READ_ONCE(current->state)
/* Task command name length: */
#define TASK_COMM_LEN 16

2
kernel/freezer.c
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@ -58,7 +58,7 @@ bool __refrigerator(bool check_kthr_stop)
/* Hmm, should we be allowed to suspend when there are realtime
processes around? */
bool was_frozen = false;
long save = current->state;
unsigned int save = get_current_state();
pr_debug("%s entered refrigerator\n", current->comm);

6
kernel/sched/core.c
View File

@ -9098,15 +9098,15 @@ static inline int preempt_count_equals(int preempt_offset)
void __might_sleep(const char *file, int line, int preempt_offset)
{
unsigned int state = get_current_state();
/*
* Blocking primitives will set (and therefore destroy) current->state,
* since we will exit with TASK_RUNNING make sure we enter with it,
* otherwise we will destroy state.
*/
WARN_ONCE(current->state != TASK_RUNNING && current->task_state_change,
WARN_ONCE(state != TASK_RUNNING && current->task_state_change,
"do not call blocking ops when !TASK_RUNNING; "
"state=%lx set at [<%p>] %pS\n",
current->state,
"state=%x set at [<%p>] %pS\n", state,
(void *)current->task_state_change,
(void *)current->task_state_change);