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2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b 
 kernel/include/linux/kfifo.h
....@@ -1,22 +1,8 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  * A generic kernel FIFO implementation
34  *
45  * Copyright (C) 2013 Stefani Seibold <stefani@seibold.net>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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- *
206  */
217 
228 #ifndef _LINUX_KFIFO_H
....@@ -258,6 +244,37 @@
258244 ({ \
259245 	typeof((fifo) + 1) __tmpq = (fifo); \
260246 	__tmpq->kfifo.in == __tmpq->kfifo.out; \
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+})
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+
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+/**
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+ * kfifo_is_empty_spinlocked - returns true if the fifo is empty using
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+ * a spinlock for locking
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+ * @fifo: address of the fifo to be used
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+ * @lock: spinlock to be used for locking
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+ */
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+#define kfifo_is_empty_spinlocked(fifo, lock) \
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+({ \
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+	unsigned long __flags; \
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+	bool __ret; \
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+	spin_lock_irqsave(lock, __flags); \
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+	__ret = kfifo_is_empty(fifo); \
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+	spin_unlock_irqrestore(lock, __flags); \
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+	__ret; \
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+})
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+
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+/**
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+ * kfifo_is_empty_spinlocked_noirqsave  - returns true if the fifo is empty
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+ * using a spinlock for locking, doesn't disable interrupts
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+ * @fifo: address of the fifo to be used
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+ * @lock: spinlock to be used for locking
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+ */
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+#define kfifo_is_empty_spinlocked_noirqsave(fifo, lock) \
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+({ \
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+	bool __ret; \
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+	spin_lock(lock); \
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+	__ret = kfifo_is_empty(fifo); \
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+	spin_unlock(lock); \
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+	__ret; \
261278 })
262279 
263280 /**
....@@ -531,6 +548,26 @@
531548 	__ret; \
532549 })
533550 
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+/**
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+ * kfifo_in_spinlocked_noirqsave - put data into fifo using a spinlock for
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+ * locking, don't disable interrupts
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+ * @fifo: address of the fifo to be used
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+ * @buf: the data to be added
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+ * @n: number of elements to be added
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+ * @lock: pointer to the spinlock to use for locking
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+ *
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+ * This is a variant of kfifo_in_spinlocked() but uses spin_lock/unlock()
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+ * for locking and doesn't disable interrupts.
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+ */
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+#define kfifo_in_spinlocked_noirqsave(fifo, buf, n, lock) \
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+({ \
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+	unsigned int __ret; \
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+	spin_lock(lock); \
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+	__ret = kfifo_in(fifo, buf, n); \
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+	spin_unlock(lock); \
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+	__ret; \
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+})
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+
534571 /* alias for kfifo_in_spinlocked, will be removed in a future release */
535572 #define kfifo_in_locked(fifo, buf, n, lock) \
536573 		kfifo_in_spinlocked(fifo, buf, n, lock)
....@@ -583,6 +620,28 @@
583620 }) \
584621 )
585622 
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+/**
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+ * kfifo_out_spinlocked_noirqsave - get data from the fifo using a spinlock
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+ * for locking, don't disable interrupts
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+ * @fifo: address of the fifo to be used
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+ * @buf: pointer to the storage buffer
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+ * @n: max. number of elements to get
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+ * @lock: pointer to the spinlock to use for locking
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+ *
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+ * This is a variant of kfifo_out_spinlocked() which uses spin_lock/unlock()
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+ * for locking and doesn't disable interrupts.
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+ */
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+#define kfifo_out_spinlocked_noirqsave(fifo, buf, n, lock) \
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+__kfifo_uint_must_check_helper( \
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+({ \
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+	unsigned int __ret; \
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+	spin_lock(lock); \
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+	__ret = kfifo_out(fifo, buf, n); \
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+	spin_unlock(lock); \
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+	__ret; \
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+}) \
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+)
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+
586645 /* alias for kfifo_out_spinlocked, will be removed in a future release */
587646 #define kfifo_out_locked(fifo, buf, n, lock) \
588647 		kfifo_out_spinlocked(fifo, buf, n, lock)
....@@ -629,7 +688,7 @@
629688  * writer, you don't need extra locking to use these macro.
630689  */
631690 #define	kfifo_to_user(fifo, to, len, copied) \
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-__kfifo_uint_must_check_helper( \
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+__kfifo_int_must_check_helper( \
633692 ({ \
634693 	typeof((fifo) + 1) __tmp = (fifo); \
635694 	void __user *__to = (to); \