diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/linux/trace_seq.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/trace_seq.h')
-rw-r--r-- | kernel/include/linux/trace_seq.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/kernel/include/linux/trace_seq.h b/kernel/include/linux/trace_seq.h new file mode 100644 index 000000000..cfaf5a1d4 --- /dev/null +++ b/kernel/include/linux/trace_seq.h @@ -0,0 +1,138 @@ +#ifndef _LINUX_TRACE_SEQ_H +#define _LINUX_TRACE_SEQ_H + +#include <linux/seq_buf.h> + +#include <asm/page.h> + +/* + * Trace sequences are used to allow a function to call several other functions + * to create a string of data to use (up to a max of PAGE_SIZE). + */ + +struct trace_seq { + unsigned char buffer[PAGE_SIZE]; + struct seq_buf seq; + int full; +}; + +static inline void +trace_seq_init(struct trace_seq *s) +{ + seq_buf_init(&s->seq, s->buffer, PAGE_SIZE); + s->full = 0; +} + +/** + * trace_seq_used - amount of actual data written to buffer + * @s: trace sequence descriptor + * + * Returns the amount of data written to the buffer. + * + * IMPORTANT! + * + * Use this instead of @s->seq.len if you need to pass the amount + * of data from the buffer to another buffer (userspace, or what not). + * The @s->seq.len on overflow is bigger than the buffer size and + * using it can cause access to undefined memory. + */ +static inline int trace_seq_used(struct trace_seq *s) +{ + return seq_buf_used(&s->seq); +} + +/** + * trace_seq_buffer_ptr - return pointer to next location in buffer + * @s: trace sequence descriptor + * + * Returns the pointer to the buffer where the next write to + * the buffer will happen. This is useful to save the location + * that is about to be written to and then return the result + * of that write. + */ +static inline unsigned char * +trace_seq_buffer_ptr(struct trace_seq *s) +{ + return s->buffer + seq_buf_used(&s->seq); +} + +/** + * trace_seq_has_overflowed - return true if the trace_seq took too much + * @s: trace sequence descriptor + * + * Returns true if too much data was added to the trace_seq and it is + * now full and will not take anymore. + */ +static inline bool trace_seq_has_overflowed(struct trace_seq *s) +{ + return s->full || seq_buf_has_overflowed(&s->seq); +} + +/* + * Currently only defined when tracing is enabled. + */ +#ifdef CONFIG_TRACING +extern __printf(2, 3) +void trace_seq_printf(struct trace_seq *s, const char *fmt, ...); +extern __printf(2, 0) +void trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args); +extern void +trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary); +extern int trace_print_seq(struct seq_file *m, struct trace_seq *s); +extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, + int cnt); +extern void trace_seq_puts(struct trace_seq *s, const char *str); +extern void trace_seq_putc(struct trace_seq *s, unsigned char c); +extern void trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len); +extern void trace_seq_putmem_hex(struct trace_seq *s, const void *mem, + unsigned int len); +extern int trace_seq_path(struct trace_seq *s, const struct path *path); + +extern void trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, + int nmaskbits); + +#else /* CONFIG_TRACING */ +static inline void trace_seq_printf(struct trace_seq *s, const char *fmt, ...) +{ +} +static inline void +trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) +{ +} + +static inline void +trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, + int nmaskbits) +{ +} + +static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) +{ + return 0; +} +static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, + int cnt) +{ + return 0; +} +static inline void trace_seq_puts(struct trace_seq *s, const char *str) +{ +} +static inline void trace_seq_putc(struct trace_seq *s, unsigned char c) +{ +} +static inline void +trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len) +{ +} +static inline void trace_seq_putmem_hex(struct trace_seq *s, const void *mem, + unsigned int len) +{ +} +static inline int trace_seq_path(struct trace_seq *s, const struct path *path) +{ + return 0; +} +#endif /* CONFIG_TRACING */ + +#endif /* _LINUX_TRACE_SEQ_H */ |