修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/include/linux/posix-timers.h
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@@ -4,6 +4,7 @@
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 #include <linux/spinlock.h>
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 #include <linux/list.h>
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+#include <linux/mutex.h>
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 #include <linux/alarmtimer.h>
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 #include <linux/timerqueue.h>
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 #include <linux/task_work.h>
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@@ -63,16 +64,18 @@
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  * cpu_timer - Posix CPU timer representation for k_itimer
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  * @node:	timerqueue node to queue in the task/sig
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  * @head:	timerqueue head on which this timer is queued
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- * @task:	Pointer to target task
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+ * @pid:	Pointer to target task PID
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  * @elist:	List head for the expiry list
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  * @firing:	Timer is currently firing
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+ * @handling:	Pointer to the task which handles expiry
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  */
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 struct cpu_timer {
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-	struct timerqueue_node	node;
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-	struct timerqueue_head	*head;
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-	struct pid		*pid;
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-	struct list_head	elist;
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-	int			firing;
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+	struct timerqueue_node		node;
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+	struct timerqueue_head		*head;
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+	struct pid			*pid;
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+	struct list_head		elist;
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+	int				firing;
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+	struct task_struct __rcu	*handling;
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 };
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 static inline bool cpu_timer_enqueue(struct timerqueue_head *head,
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@@ -129,10 +132,12 @@
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 /**
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  * posix_cputimers_work - Container for task work based posix CPU timer expiry
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  * @work:	The task work to be scheduled
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+ * @mutex:	Mutex held around expiry in context of this task work
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  * @scheduled:  @work has been scheduled already, no further processing
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  */
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 struct posix_cputimers_work {
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 	struct callback_head	work;
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+	struct mutex		mutex;
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 	unsigned int		scheduled;
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 };
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