40 	__u64 count;  member
64 	if (ULLONG_MAX - ctx->count < n)  in eventfd_signal()
65 		n = ULLONG_MAX - ctx->count;  in eventfd_signal()
66 	ctx->count += n;  in eventfd_signal()
115 	u64 count;  in eventfd_poll()  local
157 	count = READ_ONCE(ctx->count);  in eventfd_poll()
159 	if (count > 0)  in eventfd_poll()
161 	if (count == ULLONG_MAX)  in eventfd_poll()
163 	if (ULLONG_MAX - 1 > count)  in eventfd_poll()
171 	*cnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;  in eventfd_ctx_do_read()
172 	ctx->count -= *cnt;  in eventfd_ctx_do_read()
204 static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,  in eventfd_read()  argument
212 	if (count < sizeof(ucnt))  in eventfd_read()
217 	if (ctx->count > 0)  in eventfd_read()
223 			if (ctx->count > 0) {  in eventfd_read()
251 static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t count,  in eventfd_write()  argument
259 	if (count < sizeof(ucnt))  in eventfd_write()
267 	if (ULLONG_MAX - ctx->count > ucnt)  in eventfd_write()
273 			if (ULLONG_MAX - ctx->count > ucnt) {  in eventfd_write()
289 		ctx->count += ucnt;  in eventfd_write()
305 		   (unsigned long long)ctx->count);  in eventfd_show_fdinfo()
391 static int do_eventfd(unsigned int count, int flags)  in do_eventfd()  argument
409 	ctx->count = count;  in do_eventfd()
421 SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)  in SYSCALL_DEFINE2()  argument
423 	return do_eventfd(count, flags);  in SYSCALL_DEFINE2()
426 SYSCALL_DEFINE1(eventfd, unsigned int, count)  in SYSCALL_DEFINE1()  argument
428 	return do_eventfd(count, 0);  in SYSCALL_DEFINE1()