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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/seq_buf.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/linux/seq_buf.h')
-rw-r--r-- | kernel/include/linux/seq_buf.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/kernel/include/linux/seq_buf.h b/kernel/include/linux/seq_buf.h new file mode 100644 index 000000000..fb7eb9ccb --- /dev/null +++ b/kernel/include/linux/seq_buf.h @@ -0,0 +1,133 @@ +#ifndef _LINUX_SEQ_BUF_H +#define _LINUX_SEQ_BUF_H + +#include <linux/fs.h> + +/* + * Trace sequences are used to allow a function to call several other functions + * to create a string of data to use. + */ + +/** + * seq_buf - seq buffer structure + * @buffer: pointer to the buffer + * @size: size of the buffer + * @len: the amount of data inside the buffer + * @readpos: The next position to read in the buffer. + */ +struct seq_buf { + char *buffer; + size_t size; + size_t len; + loff_t readpos; +}; + +static inline void seq_buf_clear(struct seq_buf *s) +{ + s->len = 0; + s->readpos = 0; +} + +static inline void +seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size) +{ + s->buffer = buf; + s->size = size; + seq_buf_clear(s); +} + +/* + * seq_buf have a buffer that might overflow. When this happens + * the len and size are set to be equal. + */ +static inline bool +seq_buf_has_overflowed(struct seq_buf *s) +{ + return s->len > s->size; +} + +static inline void +seq_buf_set_overflow(struct seq_buf *s) +{ + s->len = s->size + 1; +} + +/* + * How much buffer is left on the seq_buf? + */ +static inline unsigned int +seq_buf_buffer_left(struct seq_buf *s) +{ + if (seq_buf_has_overflowed(s)) + return 0; + + return s->size - s->len; +} + +/* How much buffer was written? */ +static inline unsigned int seq_buf_used(struct seq_buf *s) +{ + return min(s->len, s->size); +} + +/** + * seq_buf_get_buf - get buffer to write arbitrary data to + * @s: the seq_buf handle + * @bufp: the beginning of the buffer is stored here + * + * Return the number of bytes available in the buffer, or zero if + * there's no space. + */ +static inline size_t seq_buf_get_buf(struct seq_buf *s, char **bufp) +{ + WARN_ON(s->len > s->size + 1); + + if (s->len < s->size) { + *bufp = s->buffer + s->len; + return s->size - s->len; + } + + *bufp = NULL; + return 0; +} + +/** + * seq_buf_commit - commit data to the buffer + * @s: the seq_buf handle + * @num: the number of bytes to commit + * + * Commit @num bytes of data written to a buffer previously acquired + * by seq_buf_get. To signal an error condition, or that the data + * didn't fit in the available space, pass a negative @num value. + */ +static inline void seq_buf_commit(struct seq_buf *s, int num) +{ + if (num < 0) { + seq_buf_set_overflow(s); + } else { + /* num must be negative on overflow */ + BUG_ON(s->len + num > s->size); + s->len += num; + } +} + +extern __printf(2, 3) +int seq_buf_printf(struct seq_buf *s, const char *fmt, ...); +extern __printf(2, 0) +int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args); +extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s); +extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, + int cnt); +extern int seq_buf_puts(struct seq_buf *s, const char *str); +extern int seq_buf_putc(struct seq_buf *s, unsigned char c); +extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len); +extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem, + unsigned int len); +extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc); + +#ifdef CONFIG_BINARY_PRINTF +extern int +seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary); +#endif + +#endif /* _LINUX_SEQ_BUF_H */ |