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task_work: Introduce task_work_pending

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Wrap the test of task->task_works in a helper function to make
it clear what is being tested.

All of the other readers of task->task_work use READ_ONCE and this is
even necessary on current as other processes can update
task->task_work.  So for consistency I have added READ_ONCE into
task_work_pending.

Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20220309162454.123006-7-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2022-02-09 08:52:41 -06:00
parent 8ca07e17c9
commit 7f62d40d9c
5 changed files with 13 additions and 8 deletions
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5
include/linux/task_work.h
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@ -19,6 +19,11 @@ enum task_work_notify_mode {
TWA_SIGNAL,
};
static inline bool task_work_pending(struct task_struct *task)
{
return READ_ONCE(task->task_works);
}
int task_work_add(struct task_struct *task, struct callback_head *twork,
enum task_work_notify_mode mode);