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FROMLIST: freezer: Add frozen_or_skipped() helper function

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Occasionally it is necessary to see if a task is either frozen or
sleeping in the PF_FREEZER_SKIP state. In preparation for adding
additional users of this check, introduce a frozen_or_skipped() helper
function and convert the hung task detector over to using it.

Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/linux-arch/20210525151432.16875-16-will@kernel.org/
Bug: 186372082
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I138ffe2fae5a2da96df6f30d50d3a8a0dc61724c
This commit is contained in:
Will Deacon 2021-05-25 16:14:25 +01:00 committed by Will Deacon
parent 7b04b63e1c
commit 3128f5e30c
2 changed files with 8 additions and 2 deletions
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6
include/linux/freezer.h
View File

@ -27,6 +27,11 @@ static inline bool frozen(struct task_struct *p)
return p->flags & PF_FROZEN;
}
static inline bool frozen_or_skipped(struct task_struct *p)
{
return p->flags & (PF_FROZEN | PF_FREEZER_SKIP);
}
extern bool freezing_slow_path(struct task_struct *p);
/*
@ -270,6 +275,7 @@ static inline int freezable_schedule_hrtimeout_range(ktime_t *expires,
#else /* !CONFIG_FREEZER */
static inline bool frozen(struct task_struct *p) { return false; }
static inline bool frozen_or_skipped(struct task_struct *p) { return false; }
static inline bool freezing(struct task_struct *p) { return false; }
static inline void __thaw_task(struct task_struct *t) {}

4
kernel/hung_task.c
View File

@ -94,8 +94,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
* Ensure the task is not frozen.
* Also, skip vfork and any other user process that freezer should skip.
*/
if (unlikely(t->flags & (PF_FROZEN | PF_FREEZER_SKIP)))
return;
if (unlikely(frozen_or_skipped(t)))
return;
/*
* When a freshly created task is scheduled once, changes its state to