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Subject[PATCH 2/4] remove the old non generic API
Date
From: Stefani Seibold <stefani@seibold.net>

This patch simple remove the whole kfifo.c and kfifo.h files. The next
patch will replace it with the new generic kfifo API.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
---
include/linux/kfifo.h | 615 -------------------------------------------------
kernel/kfifo.c | 445 -----------------------------------
2 files changed, 0 insertions(+), 1060 deletions(-)
delete mode 100644 include/linux/kfifo.h
delete mode 100644 kernel/kfifo.c

diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
deleted file mode 100644
index e117b1a..0000000
--- a/include/linux/kfifo.h
+++ /dev/null
@@ -1,615 +0,0 @@
-/*
- * A generic kernel FIFO implementation.
- *
- * Copyright (C) 2009 Stefani Seibold <stefani@seibold.net>
- * Copyright (C) 2004 Stelian Pop <stelian@popies.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.
- *
- */
-
-/*
- * Howto porting drivers to the new generic fifo API:
- *
- * - Modify the declaration of the "struct kfifo *" object into a
- * in-place "struct kfifo" object
- * - Init the in-place object with kfifo_alloc() or kfifo_init()
- * Note: The address of the in-place "struct kfifo" object must be
- * passed as the first argument to this functions
- * - Replace the use of __kfifo_put into kfifo_in and __kfifo_get
- * into kfifo_out
- * - Replace the use of kfifo_put into kfifo_in_locked and kfifo_get
- * into kfifo_out_locked
- * Note: the spinlock pointer formerly passed to kfifo_init/kfifo_alloc
- * must be passed now to the kfifo_in_locked and kfifo_out_locked
- * as the last parameter.
- * - All formerly name __kfifo_* functions has been renamed into kfifo_*
- */
-
-#ifndef _LINUX_KFIFO_H
-#define _LINUX_KFIFO_H
-
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-
-struct kfifo {
- unsigned char *buffer; /* the buffer holding the data */
- unsigned int size; /* the size of the allocated buffer */
- unsigned int in; /* data is added at offset (in % size) */
- unsigned int out; /* data is extracted from off. (out % size) */
-};
-
-/*
- * Macros for declaration and initialization of the kfifo datatype
- */
-
-/* helper macro */
-#define __kfifo_initializer(s, b) \
- (struct kfifo) { \
- .size = s, \
- .in = 0, \
- .out = 0, \
- .buffer = b \
- }
-
-/**
- * DECLARE_KFIFO - macro to declare a kfifo and the associated buffer
- * @name: name of the declared kfifo datatype
- * @size: size of the fifo buffer. Must be a power of two.
- *
- * Note1: the macro can be used inside struct or union declaration
- * Note2: the macro creates two objects:
- * A kfifo object with the given name and a buffer for the kfifo
- * object named name##kfifo_buffer
- */
-#define DECLARE_KFIFO(name, size) \
-union { \
- struct kfifo name; \
- unsigned char name##kfifo_buffer[size + sizeof(struct kfifo)]; \
-}
-
-/**
- * INIT_KFIFO - Initialize a kfifo declared by DECLARE_KFIFO
- * @name: name of the declared kfifo datatype
- */
-#define INIT_KFIFO(name) \
- name = __kfifo_initializer(sizeof(name##kfifo_buffer) - \
- sizeof(struct kfifo), \
- name##kfifo_buffer + sizeof(struct kfifo))
-
-/**
- * DEFINE_KFIFO - macro to define and initialize a kfifo
- * @name: name of the declared kfifo datatype
- * @size: size of the fifo buffer. Must be a power of two.
- *
- * Note1: the macro can be used for global and local kfifo data type variables
- * Note2: the macro creates two objects:
- * A kfifo object with the given name and a buffer for the kfifo
- * object named name##kfifo_buffer
- */
-#define DEFINE_KFIFO(name, size) \
- unsigned char name##kfifo_buffer[size]; \
- struct kfifo name = __kfifo_initializer(size, name##kfifo_buffer)
-
-extern void kfifo_init(struct kfifo *fifo, void *buffer,
- unsigned int size);
-extern __must_check int kfifo_alloc(struct kfifo *fifo, unsigned int size,
- gfp_t gfp_mask);
-extern void kfifo_free(struct kfifo *fifo);
-extern unsigned int kfifo_in(struct kfifo *fifo,
- const void *from, unsigned int len);
-extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
- void *to, unsigned int len);
-extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
- void *to, unsigned int len, unsigned offset);
-
-/**
- * kfifo_initialized - Check if kfifo is initialized.
- * @fifo: fifo to check
- * Return %true if FIFO is initialized, otherwise %false.
- * Assumes the fifo was 0 before.
- */
-static inline bool kfifo_initialized(struct kfifo *fifo)
-{
- return fifo->buffer != NULL;
-}
-
-/**
- * kfifo_reset - removes the entire FIFO contents
- * @fifo: the fifo to be emptied.
- */
-static inline void kfifo_reset(struct kfifo *fifo)
-{
- fifo->in = fifo->out = 0;
-}
-
-/**
- * kfifo_reset_out - skip FIFO contents
- * @fifo: the fifo to be emptied.
- */
-static inline void kfifo_reset_out(struct kfifo *fifo)
-{
- smp_mb();
- fifo->out = fifo->in;
-}
-
-/**
- * kfifo_size - returns the size of the fifo in bytes
- * @fifo: the fifo to be used.
- */
-static inline __must_check unsigned int kfifo_size(struct kfifo *fifo)
-{
- return fifo->size;
-}
-
-/**
- * kfifo_len - returns the number of used bytes in the FIFO
- * @fifo: the fifo to be used.
- */
-static inline unsigned int kfifo_len(struct kfifo *fifo)
-{
- register unsigned int out;
-
- out = fifo->out;
- smp_rmb();
- return fifo->in - out;
-}
-
-/**
- * kfifo_is_empty - returns true if the fifo is empty
- * @fifo: the fifo to be used.
- */
-static inline __must_check int kfifo_is_empty(struct kfifo *fifo)
-{
- return fifo->in == fifo->out;
-}
-
-/**
- * kfifo_is_full - returns true if the fifo is full
- * @fifo: the fifo to be used.
- */
-static inline __must_check int kfifo_is_full(struct kfifo *fifo)
-{
- return kfifo_len(fifo) == kfifo_size(fifo);
-}
-
-/**
- * kfifo_avail - returns the number of bytes available in the FIFO
- * @fifo: the fifo to be used.
- */
-static inline __must_check unsigned int kfifo_avail(struct kfifo *fifo)
-{
- return kfifo_size(fifo) - kfifo_len(fifo);
-}
-
-/**
- * kfifo_in_locked - puts some data into the FIFO using a spinlock for locking
- * @fifo: the fifo to be used.
- * @from: the data to be added.
- * @n: the length of the data to be added.
- * @lock: pointer to the spinlock to use for locking.
- *
- * This function copies at most @len bytes from the @from buffer into
- * the FIFO depending on the free space, and returns the number of
- * bytes copied.
- */
-static inline unsigned int kfifo_in_locked(struct kfifo *fifo,
- const void *from, unsigned int n, spinlock_t *lock)
-{
- unsigned long flags;
- unsigned int ret;
-
- spin_lock_irqsave(lock, flags);
-
- ret = kfifo_in(fifo, from, n);
-
- spin_unlock_irqrestore(lock, flags);
-
- return ret;
-}
-
-/**
- * kfifo_out_locked - gets some data from the FIFO using a spinlock for locking
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @n: the size of the destination buffer.
- * @lock: pointer to the spinlock to use for locking.
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and returns the number of copied bytes.
- */
-static inline __must_check unsigned int kfifo_out_locked(struct kfifo *fifo,
- void *to, unsigned int n, spinlock_t *lock)
-{
- unsigned long flags;
- unsigned int ret;
-
- spin_lock_irqsave(lock, flags);
-
- ret = kfifo_out(fifo, to, n);
-
- spin_unlock_irqrestore(lock, flags);
-
- return ret;
-}
-
-extern void kfifo_skip(struct kfifo *fifo, unsigned int len);
-
-extern __must_check int kfifo_from_user(struct kfifo *fifo,
- const void __user *from, unsigned int n, unsigned *lenout);
-
-extern __must_check int kfifo_to_user(struct kfifo *fifo,
- void __user *to, unsigned int n, unsigned *lenout);
-
-/*
- * __kfifo_add_out internal helper function for updating the out offset
- */
-static inline void __kfifo_add_out(struct kfifo *fifo,
- unsigned int off)
-{
- smp_mb();
- fifo->out += off;
-}
-
-/*
- * __kfifo_add_in internal helper function for updating the in offset
- */
-static inline void __kfifo_add_in(struct kfifo *fifo,
- unsigned int off)
-{
- smp_wmb();
- fifo->in += off;
-}
-
-/*
- * __kfifo_off internal helper function for calculating the index of a
- * given offeset
- */
-static inline unsigned int __kfifo_off(struct kfifo *fifo, unsigned int off)
-{
- return off & (fifo->size - 1);
-}
-
-/*
- * __kfifo_peek_n internal helper function for determinate the length of
- * the next record in the fifo
- */
-static inline unsigned int __kfifo_peek_n(struct kfifo *fifo,
- unsigned int recsize)
-{
-#define __KFIFO_GET(fifo, off, shift) \
- ((fifo)->buffer[__kfifo_off((fifo), (fifo)->out+(off))] << (shift))
-
- unsigned int l;
-
- l = __KFIFO_GET(fifo, 0, 0);
-
- if (--recsize)
- l |= __KFIFO_GET(fifo, 1, 8);
-
- return l;
-#undef __KFIFO_GET
-}
-
-/*
- * __kfifo_poke_n internal helper function for storing the length of
- * the next record into the fifo
- */
-static inline void __kfifo_poke_n(struct kfifo *fifo,
- unsigned int recsize, unsigned int n)
-{
-#define __KFIFO_PUT(fifo, off, val, shift) \
- ( \
- (fifo)->buffer[__kfifo_off((fifo), (fifo)->in+(off))] = \
- (unsigned char)((val) >> (shift)) \
- )
-
- __KFIFO_PUT(fifo, 0, n, 0);
-
- if (--recsize)
- __KFIFO_PUT(fifo, 1, n, 8);
-#undef __KFIFO_PUT
-}
-
-/*
- * __kfifo_in_... internal functions for put date into the fifo
- * do not call it directly, use kfifo_in_rec() instead
- */
-extern unsigned int __kfifo_in_n(struct kfifo *fifo,
- const void *from, unsigned int n, unsigned int recsize);
-
-extern unsigned int __kfifo_in_generic(struct kfifo *fifo,
- const void *from, unsigned int n, unsigned int recsize);
-
-static inline unsigned int __kfifo_in_rec(struct kfifo *fifo,
- const void *from, unsigned int n, unsigned int recsize)
-{
- unsigned int ret;
-
- ret = __kfifo_in_n(fifo, from, n, recsize);
-
- if (likely(ret == 0)) {
- if (recsize)
- __kfifo_poke_n(fifo, recsize, n);
- __kfifo_add_in(fifo, n + recsize);
- }
- return ret;
-}
-
-/**
- * kfifo_in_rec - puts some record data into the FIFO
- * @fifo: the fifo to be used.
- * @from: the data to be added.
- * @n: the length of the data to be added.
- * @recsize: size of record field
- *
- * This function copies @n bytes from the @from into the FIFO and returns
- * the number of bytes which cannot be copied.
- * A returned value greater than the @n value means that the record doesn't
- * fit into the buffer.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-static inline __must_check unsigned int kfifo_in_rec(struct kfifo *fifo,
- void *from, unsigned int n, unsigned int recsize)
-{
- if (!__builtin_constant_p(recsize))
- return __kfifo_in_generic(fifo, from, n, recsize);
- return __kfifo_in_rec(fifo, from, n, recsize);
-}
-
-/*
- * __kfifo_out_... internal functions for get date from the fifo
- * do not call it directly, use kfifo_out_rec() instead
- */
-extern unsigned int __kfifo_out_n(struct kfifo *fifo,
- void *to, unsigned int reclen, unsigned int recsize);
-
-extern unsigned int __kfifo_out_generic(struct kfifo *fifo,
- void *to, unsigned int n,
- unsigned int recsize, unsigned int *total);
-
-static inline unsigned int __kfifo_out_rec(struct kfifo *fifo,
- void *to, unsigned int n, unsigned int recsize,
- unsigned int *total)
-{
- unsigned int l;
-
- if (!recsize) {
- l = n;
- if (total)
- *total = l;
- } else {
- l = __kfifo_peek_n(fifo, recsize);
- if (total)
- *total = l;
- if (n < l)
- return l;
- }
-
- return __kfifo_out_n(fifo, to, l, recsize);
-}
-
-/**
- * kfifo_out_rec - gets some record data from the FIFO
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @n: the size of the destination buffer.
- * @recsize: size of record field
- * @total: pointer where the total number of to copied bytes should stored
- *
- * This function copies at most @n bytes from the FIFO to @to and returns the
- * number of bytes which cannot be copied.
- * A returned value greater than the @n value means that the record doesn't
- * fit into the @to buffer.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-static inline __must_check unsigned int kfifo_out_rec(struct kfifo *fifo,
- void *to, unsigned int n, unsigned int recsize,
- unsigned int *total)
-
-{
- if (!__builtin_constant_p(recsize))
- return __kfifo_out_generic(fifo, to, n, recsize, total);
- return __kfifo_out_rec(fifo, to, n, recsize, total);
-}
-
-/*
- * __kfifo_from_user_... internal functions for transfer from user space into
- * the fifo. do not call it directly, use kfifo_from_user_rec() instead
- */
-extern unsigned int __kfifo_from_user_n(struct kfifo *fifo,
- const void __user *from, unsigned int n, unsigned int recsize);
-
-extern unsigned int __kfifo_from_user_generic(struct kfifo *fifo,
- const void __user *from, unsigned int n, unsigned int recsize);
-
-static inline unsigned int __kfifo_from_user_rec(struct kfifo *fifo,
- const void __user *from, unsigned int n, unsigned int recsize)
-{
- unsigned int ret;
-
- ret = __kfifo_from_user_n(fifo, from, n, recsize);
-
- if (likely(ret == 0)) {
- if (recsize)
- __kfifo_poke_n(fifo, recsize, n);
- __kfifo_add_in(fifo, n + recsize);
- }
- return ret;
-}
-
-/**
- * kfifo_from_user_rec - puts some data from user space into the FIFO
- * @fifo: the fifo to be used.
- * @from: pointer to the data to be added.
- * @n: the length of the data to be added.
- * @recsize: size of record field
- *
- * This function copies @n bytes from the @from into the
- * FIFO and returns the number of bytes which cannot be copied.
- *
- * If the returned value is equal or less the @n value, the copy_from_user()
- * functions has failed. Otherwise the record doesn't fit into the buffer.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-static inline __must_check unsigned int kfifo_from_user_rec(struct kfifo *fifo,
- const void __user *from, unsigned int n, unsigned int recsize)
-{
- if (!__builtin_constant_p(recsize))
- return __kfifo_from_user_generic(fifo, from, n, recsize);
- return __kfifo_from_user_rec(fifo, from, n, recsize);
-}
-
-/*
- * __kfifo_to_user_... internal functions for transfer fifo data into user space
- * do not call it directly, use kfifo_to_user_rec() instead
- */
-extern unsigned int __kfifo_to_user_n(struct kfifo *fifo,
- void __user *to, unsigned int n, unsigned int reclen,
- unsigned int recsize);
-
-extern unsigned int __kfifo_to_user_generic(struct kfifo *fifo,
- void __user *to, unsigned int n, unsigned int recsize,
- unsigned int *total);
-
-static inline unsigned int __kfifo_to_user_rec(struct kfifo *fifo,
- void __user *to, unsigned int n,
- unsigned int recsize, unsigned int *total)
-{
- unsigned int l;
-
- if (!recsize) {
- l = n;
- if (total)
- *total = l;
- } else {
- l = __kfifo_peek_n(fifo, recsize);
- if (total)
- *total = l;
- if (n < l)
- return l;
- }
-
- return __kfifo_to_user_n(fifo, to, n, l, recsize);
-}
-
-/**
- * kfifo_to_user_rec - gets data from the FIFO and write it to user space
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @n: the size of the destination buffer.
- * @recsize: size of record field
- * @total: pointer where the total number of to copied bytes should stored
- *
- * This function copies at most @n bytes from the FIFO to the @to.
- * In case of an error, the function returns the number of bytes which cannot
- * be copied.
- * If the returned value is equal or less the @n value, the copy_to_user()
- * functions has failed. Otherwise the record doesn't fit into the @to buffer.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-static inline __must_check unsigned int kfifo_to_user_rec(struct kfifo *fifo,
- void __user *to, unsigned int n, unsigned int recsize,
- unsigned int *total)
-{
- if (!__builtin_constant_p(recsize))
- return __kfifo_to_user_generic(fifo, to, n, recsize, total);
- return __kfifo_to_user_rec(fifo, to, n, recsize, total);
-}
-
-/*
- * __kfifo_peek_... internal functions for peek into the next fifo record
- * do not call it directly, use kfifo_peek_rec() instead
- */
-extern unsigned int __kfifo_peek_generic(struct kfifo *fifo,
- unsigned int recsize);
-
-/**
- * kfifo_peek_rec - gets the size of the next FIFO record data
- * @fifo: the fifo to be used.
- * @recsize: size of record field
- *
- * This function returns the size of the next FIFO record in number of bytes
- */
-static inline __must_check unsigned int kfifo_peek_rec(struct kfifo *fifo,
- unsigned int recsize)
-{
- if (!__builtin_constant_p(recsize))
- return __kfifo_peek_generic(fifo, recsize);
- if (!recsize)
- return kfifo_len(fifo);
- return __kfifo_peek_n(fifo, recsize);
-}
-
-/*
- * __kfifo_skip_... internal functions for skip the next fifo record
- * do not call it directly, use kfifo_skip_rec() instead
- */
-extern void __kfifo_skip_generic(struct kfifo *fifo, unsigned int recsize);
-
-static inline void __kfifo_skip_rec(struct kfifo *fifo,
- unsigned int recsize)
-{
- unsigned int l;
-
- if (recsize) {
- l = __kfifo_peek_n(fifo, recsize);
-
- if (l + recsize <= kfifo_len(fifo)) {
- __kfifo_add_out(fifo, l + recsize);
- return;
- }
- }
- kfifo_reset_out(fifo);
-}
-
-/**
- * kfifo_skip_rec - skip the next fifo out record
- * @fifo: the fifo to be used.
- * @recsize: size of record field
- *
- * This function skips the next FIFO record
- */
-static inline void kfifo_skip_rec(struct kfifo *fifo,
- unsigned int recsize)
-{
- if (!__builtin_constant_p(recsize))
- __kfifo_skip_generic(fifo, recsize);
- else
- __kfifo_skip_rec(fifo, recsize);
-}
-
-/**
- * kfifo_avail_rec - returns the number of bytes available in a record FIFO
- * @fifo: the fifo to be used.
- * @recsize: size of record field
- */
-static inline __must_check unsigned int kfifo_avail_rec(struct kfifo *fifo,
- unsigned int recsize)
-{
- unsigned int l = kfifo_size(fifo) - kfifo_len(fifo);
-
- return (l > recsize) ? l - recsize : 0;
-}
-
-#endif
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
deleted file mode 100644
index 35edbe2..0000000
--- a/kernel/kfifo.c
+++ /dev/null
@@ -1,445 +0,0 @@
-/*
- * A generic kernel FIFO implementation.
- *
- * Copyright (C) 2009 Stefani Seibold <stefani@seibold.net>
- * Copyright (C) 2004 Stelian Pop <stelian@popies.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.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/kfifo.h>
-#include <linux/log2.h>
-#include <linux/uaccess.h>
-
-static void _kfifo_init(struct kfifo *fifo, void *buffer,
- unsigned int size)
-{
- fifo->buffer = buffer;
- fifo->size = size;
-
- kfifo_reset(fifo);
-}
-
-/**
- * kfifo_init - initialize a FIFO using a preallocated buffer
- * @fifo: the fifo to assign the buffer
- * @buffer: the preallocated buffer to be used.
- * @size: the size of the internal buffer, this has to be a power of 2.
- *
- */
-void kfifo_init(struct kfifo *fifo, void *buffer, unsigned int size)
-{
- /* size must be a power of 2 */
- BUG_ON(!is_power_of_2(size));
-
- _kfifo_init(fifo, buffer, size);
-}
-EXPORT_SYMBOL(kfifo_init);
-
-/**
- * kfifo_alloc - allocates a new FIFO internal buffer
- * @fifo: the fifo to assign then new buffer
- * @size: the size of the buffer to be allocated, this have to be a power of 2.
- * @gfp_mask: get_free_pages mask, passed to kmalloc()
- *
- * This function dynamically allocates a new fifo internal buffer
- *
- * The size will be rounded-up to a power of 2.
- * The buffer will be release with kfifo_free().
- * Return 0 if no error, otherwise the an error code
- */
-int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask)
-{
- unsigned char *buffer;
-
- /*
- * round up to the next power of 2, since our 'let the indices
- * wrap' technique works only in this case.
- */
- if (!is_power_of_2(size)) {
- BUG_ON(size > 0x80000000);
- size = roundup_pow_of_two(size);
- }
-
- buffer = kmalloc(size, gfp_mask);
- if (!buffer) {
- _kfifo_init(fifo, NULL, 0);
- return -ENOMEM;
- }
-
- _kfifo_init(fifo, buffer, size);
-
- return 0;
-}
-EXPORT_SYMBOL(kfifo_alloc);
-
-/**
- * kfifo_free - frees the FIFO internal buffer
- * @fifo: the fifo to be freed.
- */
-void kfifo_free(struct kfifo *fifo)
-{
- kfree(fifo->buffer);
- _kfifo_init(fifo, NULL, 0);
-}
-EXPORT_SYMBOL(kfifo_free);
-
-/**
- * kfifo_skip - skip output data
- * @fifo: the fifo to be used.
- * @len: number of bytes to skip
- */
-void kfifo_skip(struct kfifo *fifo, unsigned int len)
-{
- if (len < kfifo_len(fifo)) {
- __kfifo_add_out(fifo, len);
- return;
- }
- kfifo_reset_out(fifo);
-}
-EXPORT_SYMBOL(kfifo_skip);
-
-static inline void __kfifo_in_data(struct kfifo *fifo,
- const void *from, unsigned int len, unsigned int off)
-{
- unsigned int l;
-
- /*
- * Ensure that we sample the fifo->out index -before- we
- * start putting bytes into the kfifo.
- */
-
- smp_mb();
-
- off = __kfifo_off(fifo, fifo->in + off);
-
- /* first put the data starting from fifo->in to buffer end */
- l = min(len, fifo->size - off);
- memcpy(fifo->buffer + off, from, l);
-
- /* then put the rest (if any) at the beginning of the buffer */
- memcpy(fifo->buffer, from + l, len - l);
-}
-
-static inline void __kfifo_out_data(struct kfifo *fifo,
- void *to, unsigned int len, unsigned int off)
-{
- unsigned int l;
-
- /*
- * Ensure that we sample the fifo->in index -before- we
- * start removing bytes from the kfifo.
- */
-
- smp_rmb();
-
- off = __kfifo_off(fifo, fifo->out + off);
-
- /* first get the data from fifo->out until the end of the buffer */
- l = min(len, fifo->size - off);
- memcpy(to, fifo->buffer + off, l);
-
- /* then get the rest (if any) from the beginning of the buffer */
- memcpy(to + l, fifo->buffer, len - l);
-}
-
-static inline int __kfifo_from_user_data(struct kfifo *fifo,
- const void __user *from, unsigned int len, unsigned int off,
- unsigned *lenout)
-{
- unsigned int l;
- int ret;
-
- /*
- * Ensure that we sample the fifo->out index -before- we
- * start putting bytes into the kfifo.
- */
-
- smp_mb();
-
- off = __kfifo_off(fifo, fifo->in + off);
-
- /* first put the data starting from fifo->in to buffer end */
- l = min(len, fifo->size - off);
- ret = copy_from_user(fifo->buffer + off, from, l);
- if (unlikely(ret)) {
- *lenout = ret;
- return -EFAULT;
- }
- *lenout = l;
-
- /* then put the rest (if any) at the beginning of the buffer */
- ret = copy_from_user(fifo->buffer, from + l, len - l);
- *lenout += ret ? ret : len - l;
- return ret ? -EFAULT : 0;
-}
-
-static inline int __kfifo_to_user_data(struct kfifo *fifo,
- void __user *to, unsigned int len, unsigned int off, unsigned *lenout)
-{
- unsigned int l;
- int ret;
-
- /*
- * Ensure that we sample the fifo->in index -before- we
- * start removing bytes from the kfifo.
- */
-
- smp_rmb();
-
- off = __kfifo_off(fifo, fifo->out + off);
-
- /* first get the data from fifo->out until the end of the buffer */
- l = min(len, fifo->size - off);
- ret = copy_to_user(to, fifo->buffer + off, l);
- *lenout = l;
- if (unlikely(ret)) {
- *lenout -= ret;
- return -EFAULT;
- }
-
- /* then get the rest (if any) from the beginning of the buffer */
- len -= l;
- ret = copy_to_user(to + l, fifo->buffer, len);
- if (unlikely(ret)) {
- *lenout += len - ret;
- return -EFAULT;
- }
- *lenout += len;
- return 0;
-}
-
-unsigned int __kfifo_in_n(struct kfifo *fifo,
- const void *from, unsigned int len, unsigned int recsize)
-{
- if (kfifo_avail(fifo) < len + recsize)
- return len + 1;
-
- __kfifo_in_data(fifo, from, len, recsize);
- return 0;
-}
-EXPORT_SYMBOL(__kfifo_in_n);
-
-/**
- * kfifo_in - puts some data into the FIFO
- * @fifo: the fifo to be used.
- * @from: the data to be added.
- * @len: the length of the data to be added.
- *
- * This function copies at most @len bytes from the @from buffer into
- * the FIFO depending on the free space, and returns the number of
- * bytes copied.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-unsigned int kfifo_in(struct kfifo *fifo, const void *from,
- unsigned int len)
-{
- len = min(kfifo_avail(fifo), len);
-
- __kfifo_in_data(fifo, from, len, 0);
- __kfifo_add_in(fifo, len);
- return len;
-}
-EXPORT_SYMBOL(kfifo_in);
-
-unsigned int __kfifo_in_generic(struct kfifo *fifo,
- const void *from, unsigned int len, unsigned int recsize)
-{
- return __kfifo_in_rec(fifo, from, len, recsize);
-}
-EXPORT_SYMBOL(__kfifo_in_generic);
-
-unsigned int __kfifo_out_n(struct kfifo *fifo,
- void *to, unsigned int len, unsigned int recsize)
-{
- if (kfifo_len(fifo) < len + recsize)
- return len;
-
- __kfifo_out_data(fifo, to, len, recsize);
- __kfifo_add_out(fifo, len + recsize);
- return 0;
-}
-EXPORT_SYMBOL(__kfifo_out_n);
-
-/**
- * kfifo_out - gets some data from the FIFO
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and returns the number of copied bytes.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-unsigned int kfifo_out(struct kfifo *fifo, void *to, unsigned int len)
-{
- len = min(kfifo_len(fifo), len);
-
- __kfifo_out_data(fifo, to, len, 0);
- __kfifo_add_out(fifo, len);
-
- return len;
-}
-EXPORT_SYMBOL(kfifo_out);
-
-/**
- * kfifo_out_peek - copy some data from the FIFO, but do not remove it
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @offset: offset into the fifo
- *
- * This function copies at most @len bytes at @offset from the FIFO
- * into the @to buffer and returns the number of copied bytes.
- * The data is not removed from the FIFO.
- */
-unsigned int kfifo_out_peek(struct kfifo *fifo, void *to, unsigned int len,
- unsigned offset)
-{
- len = min(kfifo_len(fifo), len + offset);
-
- __kfifo_out_data(fifo, to, len, offset);
- return len;
-}
-EXPORT_SYMBOL(kfifo_out_peek);
-
-unsigned int __kfifo_out_generic(struct kfifo *fifo,
- void *to, unsigned int len, unsigned int recsize,
- unsigned int *total)
-{
- return __kfifo_out_rec(fifo, to, len, recsize, total);
-}
-EXPORT_SYMBOL(__kfifo_out_generic);
-
-unsigned int __kfifo_from_user_n(struct kfifo *fifo,
- const void __user *from, unsigned int len, unsigned int recsize)
-{
- unsigned total;
-
- if (kfifo_avail(fifo) < len + recsize)
- return len + 1;
-
- __kfifo_from_user_data(fifo, from, len, recsize, &total);
- return total;
-}
-EXPORT_SYMBOL(__kfifo_from_user_n);
-
-/**
- * kfifo_from_user - puts some data from user space into the FIFO
- * @fifo: the fifo to be used.
- * @from: pointer to the data to be added.
- * @len: the length of the data to be added.
- * @total: the actual returned data length.
- *
- * This function copies at most @len bytes from the @from into the
- * FIFO depending and returns -EFAULT/0.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_from_user(struct kfifo *fifo,
- const void __user *from, unsigned int len, unsigned *total)
-{
- int ret;
- len = min(kfifo_avail(fifo), len);
- ret = __kfifo_from_user_data(fifo, from, len, 0, total);
- if (ret)
- return ret;
- __kfifo_add_in(fifo, len);
- return 0;
-}
-EXPORT_SYMBOL(kfifo_from_user);
-
-unsigned int __kfifo_from_user_generic(struct kfifo *fifo,
- const void __user *from, unsigned int len, unsigned int recsize)
-{
- return __kfifo_from_user_rec(fifo, from, len, recsize);
-}
-EXPORT_SYMBOL(__kfifo_from_user_generic);
-
-unsigned int __kfifo_to_user_n(struct kfifo *fifo,
- void __user *to, unsigned int len, unsigned int reclen,
- unsigned int recsize)
-{
- unsigned int ret, total;
-
- if (kfifo_len(fifo) < reclen + recsize)
- return len;
-
- ret = __kfifo_to_user_data(fifo, to, reclen, recsize, &total);
-
- if (likely(ret == 0))
- __kfifo_add_out(fifo, reclen + recsize);
-
- return total;
-}
-EXPORT_SYMBOL(__kfifo_to_user_n);
-
-/**
- * kfifo_to_user - gets data from the FIFO and write it to user space
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @lenout: pointer to output variable with copied data
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and 0 or -EFAULT.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_to_user(struct kfifo *fifo,
- void __user *to, unsigned int len, unsigned *lenout)
-{
- int ret;
- len = min(kfifo_len(fifo), len);
- ret = __kfifo_to_user_data(fifo, to, len, 0, lenout);
- __kfifo_add_out(fifo, *lenout);
- return ret;
-}
-EXPORT_SYMBOL(kfifo_to_user);
-
-unsigned int __kfifo_to_user_generic(struct kfifo *fifo,
- void __user *to, unsigned int len, unsigned int recsize,
- unsigned int *total)
-{
- return __kfifo_to_user_rec(fifo, to, len, recsize, total);
-}
-EXPORT_SYMBOL(__kfifo_to_user_generic);
-
-unsigned int __kfifo_peek_generic(struct kfifo *fifo, unsigned int recsize)
-{
- if (recsize == 0)
- return kfifo_avail(fifo);
-
- return __kfifo_peek_n(fifo, recsize);
-}
-EXPORT_SYMBOL(__kfifo_peek_generic);
-
-void __kfifo_skip_generic(struct kfifo *fifo, unsigned int recsize)
-{
- __kfifo_skip_rec(fifo, recsize);
-}
-EXPORT_SYMBOL(__kfifo_skip_generic);
-
--
1.7.0.4


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