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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/kernel/events/internal.h
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@@ -4,13 +4,14 @@
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 #include <linux/hardirq.h>
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 #include <linux/uaccess.h>
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+#include <linux/refcount.h>
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 /* Buffer handling */
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 #define RING_BUFFER_WRITABLE		0x01
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-struct ring_buffer {
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-	atomic_t			refcount;
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+struct perf_buffer {
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+	refcount_t			refcount;
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 	struct rcu_head			rcu_head;
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 #ifdef CONFIG_PERF_USE_VMALLOC
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 	struct work_struct		work;
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@@ -23,7 +24,7 @@
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 	atomic_t			poll;		/* POLL_ for wakeups */
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 	local_t				head;		/* write position    */
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-	local_t				nest;		/* nested writers    */
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+	unsigned int			nest;		/* nested writers    */
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 	local_t				events;		/* event limit       */
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 	local_t				wakeup;		/* wakeup stamp      */
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 	local_t				lost;		/* nr records lost   */
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@@ -40,7 +41,7 @@
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 	/* AUX area */
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 	long				aux_head;
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-	local_t				aux_nest;
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+	unsigned int			aux_nest;
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 	long				aux_wakeup;	/* last aux_watermark boundary crossed by aux_head */
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 	unsigned long			aux_pgoff;
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 	int				aux_nr_pages;
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@@ -48,25 +49,26 @@
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 	atomic_t			aux_mmap_count;
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 	unsigned long			aux_mmap_locked;
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 	void				(*free_aux)(void *);
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-	atomic_t			aux_refcount;
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+	refcount_t			aux_refcount;
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+	int				aux_in_sampling;
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 	void				**aux_pages;
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 	void				*aux_priv;
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 	struct perf_event_mmap_page	*user_page;
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-	void				*data_pages[0];
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+	void				*data_pages[];
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 };
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-extern void rb_free(struct ring_buffer *rb);
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+extern void rb_free(struct perf_buffer *rb);
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 static inline void rb_free_rcu(struct rcu_head *rcu_head)
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 {
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-	struct ring_buffer *rb;
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+	struct perf_buffer *rb;
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-	rb = container_of(rcu_head, struct ring_buffer, rcu_head);
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+	rb = container_of(rcu_head, struct perf_buffer, rcu_head);
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 	rb_free(rb);
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 }
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-static inline void rb_toggle_paused(struct ring_buffer *rb, bool pause)
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+static inline void rb_toggle_paused(struct perf_buffer *rb, bool pause)
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 {
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 	if (!pause && rb->nr_pages)
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 		rb->paused = 0;
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@@ -74,16 +76,16 @@
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 		rb->paused = 1;
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 }
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-extern struct ring_buffer *
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+extern struct perf_buffer *
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 rb_alloc(int nr_pages, long watermark, int cpu, int flags);
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 extern void perf_event_wakeup(struct perf_event *event);
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-extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,
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+extern int rb_alloc_aux(struct perf_buffer *rb, struct perf_event *event,
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 			pgoff_t pgoff, int nr_pages, long watermark, int flags);
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-extern void rb_free_aux(struct ring_buffer *rb);
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-extern struct ring_buffer *ring_buffer_get(struct perf_event *event);
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-extern void ring_buffer_put(struct ring_buffer *rb);
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+extern void rb_free_aux(struct perf_buffer *rb);
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+extern struct perf_buffer *ring_buffer_get(struct perf_event *event);
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+extern void ring_buffer_put(struct perf_buffer *rb);
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-static inline bool rb_has_aux(struct ring_buffer *rb)
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+static inline bool rb_has_aux(struct perf_buffer *rb)
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 {
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 	return !!rb->aux_nr_pages;
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 }
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@@ -92,7 +94,7 @@
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 			  unsigned long size, u64 flags);
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 extern struct page *
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-perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
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+perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff);
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 #ifdef CONFIG_PERF_USE_VMALLOC
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 /*
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@@ -101,25 +103,30 @@
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  * Required for architectures that have d-cache aliasing issues.
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  */
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-static inline int page_order(struct ring_buffer *rb)
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+static inline int page_order(struct perf_buffer *rb)
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 {
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 	return rb->page_order;
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 }
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 #else
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-static inline int page_order(struct ring_buffer *rb)
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+static inline int page_order(struct perf_buffer *rb)
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 {
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 	return 0;
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 }
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 #endif
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-static inline unsigned long perf_data_size(struct ring_buffer *rb)
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+static inline int data_page_nr(struct perf_buffer *rb)
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+{
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+	return rb->nr_pages << page_order(rb);
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+}
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+
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+static inline unsigned long perf_data_size(struct perf_buffer *rb)
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 {
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 	return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
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 }
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-static inline unsigned long perf_aux_size(struct ring_buffer *rb)
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+static inline unsigned long perf_aux_size(struct perf_buffer *rb)
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 {
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 	return rb->aux_nr_pages << PAGE_SHIFT;
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 }
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@@ -139,7 +146,7 @@
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 			buf += written;					\
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 		handle->size -= written;				\
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 		if (!handle->size) {					\
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-			struct ring_buffer *rb = handle->rb;		\
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+			struct perf_buffer *rb = handle->rb;	\
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 									\
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 			handle->page++;					\
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 			handle->page &= rb->nr_pages - 1;		\
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@@ -203,16 +210,12 @@
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 static inline int get_recursion_context(int *recursion)
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 {
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-	int rctx;
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+	unsigned int pc = preempt_count();
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+	unsigned char rctx = 0;
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-	if (unlikely(in_nmi()))
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-		rctx = 3;
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-	else if (in_irq())
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-		rctx = 2;
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-	else if (in_serving_softirq())
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-		rctx = 1;
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-	else
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-		rctx = 0;
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+	rctx += !!(pc & (NMI_MASK));
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+	rctx += !!(pc & (NMI_MASK | HARDIRQ_MASK));
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+	rctx += !!(pc & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET));
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 	if (recursion[rctx])
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 		return -1;