From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/include/linux/kfifo.h | 91 +++++++++++++++++++++++++++++++++++++--------
1 files changed, 75 insertions(+), 16 deletions(-)
diff --git a/kernel/include/linux/kfifo.h b/kernel/include/linux/kfifo.h
index 89fc8dc..0b35a41 100644
--- a/kernel/include/linux/kfifo.h
+++ b/kernel/include/linux/kfifo.h
@@ -1,22 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* A generic kernel FIFO implementation
*
* Copyright (C) 2013 Stefani Seibold <stefani@seibold.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
*/
#ifndef _LINUX_KFIFO_H
@@ -258,6 +244,37 @@
({ \
typeof((fifo) + 1) __tmpq = (fifo); \
__tmpq->kfifo.in == __tmpq->kfifo.out; \
+})
+
+/**
+ * kfifo_is_empty_spinlocked - returns true if the fifo is empty using
+ * a spinlock for locking
+ * @fifo: address of the fifo to be used
+ * @lock: spinlock to be used for locking
+ */
+#define kfifo_is_empty_spinlocked(fifo, lock) \
+({ \
+ unsigned long __flags; \
+ bool __ret; \
+ spin_lock_irqsave(lock, __flags); \
+ __ret = kfifo_is_empty(fifo); \
+ spin_unlock_irqrestore(lock, __flags); \
+ __ret; \
+})
+
+/**
+ * kfifo_is_empty_spinlocked_noirqsave - returns true if the fifo is empty
+ * using a spinlock for locking, doesn't disable interrupts
+ * @fifo: address of the fifo to be used
+ * @lock: spinlock to be used for locking
+ */
+#define kfifo_is_empty_spinlocked_noirqsave(fifo, lock) \
+({ \
+ bool __ret; \
+ spin_lock(lock); \
+ __ret = kfifo_is_empty(fifo); \
+ spin_unlock(lock); \
+ __ret; \
})
/**
@@ -531,6 +548,26 @@
__ret; \
})
+/**
+ * kfifo_in_spinlocked_noirqsave - put data into fifo using a spinlock for
+ * locking, don't disable interrupts
+ * @fifo: address of the fifo to be used
+ * @buf: the data to be added
+ * @n: number of elements to be added
+ * @lock: pointer to the spinlock to use for locking
+ *
+ * This is a variant of kfifo_in_spinlocked() but uses spin_lock/unlock()
+ * for locking and doesn't disable interrupts.
+ */
+#define kfifo_in_spinlocked_noirqsave(fifo, buf, n, lock) \
+({ \
+ unsigned int __ret; \
+ spin_lock(lock); \
+ __ret = kfifo_in(fifo, buf, n); \
+ spin_unlock(lock); \
+ __ret; \
+})
+
/* alias for kfifo_in_spinlocked, will be removed in a future release */
#define kfifo_in_locked(fifo, buf, n, lock) \
kfifo_in_spinlocked(fifo, buf, n, lock)
@@ -583,6 +620,28 @@
}) \
)
+/**
+ * kfifo_out_spinlocked_noirqsave - get data from the fifo using a spinlock
+ * for locking, don't disable interrupts
+ * @fifo: address of the fifo to be used
+ * @buf: pointer to the storage buffer
+ * @n: max. number of elements to get
+ * @lock: pointer to the spinlock to use for locking
+ *
+ * This is a variant of kfifo_out_spinlocked() which uses spin_lock/unlock()
+ * for locking and doesn't disable interrupts.
+ */
+#define kfifo_out_spinlocked_noirqsave(fifo, buf, n, lock) \
+__kfifo_uint_must_check_helper( \
+({ \
+ unsigned int __ret; \
+ spin_lock(lock); \
+ __ret = kfifo_out(fifo, buf, n); \
+ spin_unlock(lock); \
+ __ret; \
+}) \
+)
+
/* alias for kfifo_out_spinlocked, will be removed in a future release */
#define kfifo_out_locked(fifo, buf, n, lock) \
kfifo_out_spinlocked(fifo, buf, n, lock)
@@ -629,7 +688,7 @@
* writer, you don't need extra locking to use these macro.
*/
#define kfifo_to_user(fifo, to, len, copied) \
-__kfifo_uint_must_check_helper( \
+__kfifo_int_must_check_helper( \
({ \
typeof((fifo) + 1) __tmp = (fifo); \
void __user *__to = (to); \
--
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