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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/eventfd.h
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@@ -14,6 +14,7 @@
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 #include <linux/err.h>
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 #include <linux/percpu-defs.h>
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 #include <linux/percpu.h>
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+#include <linux/sched.h>
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 /*
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  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
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@@ -39,14 +40,13 @@
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 struct eventfd_ctx *eventfd_ctx_fdget(int fd);
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 struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
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 __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
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+__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, unsigned mask);
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 int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
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 				  __u64 *cnt);
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-DECLARE_PER_CPU(int, eventfd_wake_count);
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-
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-static inline bool eventfd_signal_count(void)
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+static inline bool eventfd_signal_allowed(void)
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 {
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-	return this_cpu_read(eventfd_wake_count);
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+	return !current->in_eventfd_signal;
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 }
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 #else /* CONFIG_EVENTFD */
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@@ -66,6 +66,12 @@
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 	return -ENOSYS;
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 }
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+static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n,
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+				      unsigned mask)
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+{
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+	return -ENOSYS;
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+}
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+
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 static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
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 {
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@@ -77,9 +83,9 @@
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 	return -ENOSYS;
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 }
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-static inline bool eventfd_signal_count(void)
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+static inline bool eventfd_signal_allowed(void)
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 {
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-	return false;
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+	return true;
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 }
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 #endif