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36aabfff50
For using trace_seq_*() functions in NMI context, I posted a patch to move it to the lib/ directory. This caused Andrew Morton to take a look at the code. He went through and gave a lot of comments about missing kernel doc, inconsistent types for the save variable, mix match of EXPORT_SYMBOL_GPL() and EXPORT_SYMBOL() as well as missing EXPORT_SYMBOL*()s. There were a few comments about the way variables were being compared (int vs uint). All these were good review comments and should be implemented regardless of if trace_seq.c should be moved to lib/ or not. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
#ifndef _LINUX_TRACE_SEQ_H
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#define _LINUX_TRACE_SEQ_H
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#include <linux/fs.h>
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#include <asm/page.h>
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/*
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* Trace sequences are used to allow a function to call several other functions
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* to create a string of data to use (up to a max of PAGE_SIZE).
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*/
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struct trace_seq {
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unsigned char buffer[PAGE_SIZE];
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unsigned int len;
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unsigned int readpos;
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int full;
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};
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static inline void
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trace_seq_init(struct trace_seq *s)
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{
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s->len = 0;
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s->readpos = 0;
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s->full = 0;
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}
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#define MAX_MEMHEX_BYTES 8
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/*
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* Currently only defined when tracing is enabled.
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*/
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#ifdef CONFIG_TRACING
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extern __printf(2, 3)
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int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
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extern __printf(2, 0)
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int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
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extern int
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trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
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extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
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extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
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int cnt);
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extern int trace_seq_puts(struct trace_seq *s, const char *str);
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extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
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extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len);
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extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
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unsigned int len);
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extern void *trace_seq_reserve(struct trace_seq *s, unsigned int len);
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extern int trace_seq_path(struct trace_seq *s, const struct path *path);
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extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
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int nmaskbits);
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#else /* CONFIG_TRACING */
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static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
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{
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return 0;
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}
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static inline int
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trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
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{
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return 0;
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}
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static inline int
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trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
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int nmaskbits)
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{
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return 0;
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}
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static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
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{
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return 0;
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}
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static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
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int cnt)
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{
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return 0;
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}
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static inline int trace_seq_puts(struct trace_seq *s, const char *str)
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{
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return 0;
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}
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static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
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{
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return 0;
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}
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static inline int
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trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len)
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{
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return 0;
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}
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static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
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unsigned int len)
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{
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return 0;
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}
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static inline void *trace_seq_reserve(struct trace_seq *s, unsigned int len)
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{
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return NULL;
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}
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static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
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{
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return 0;
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}
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#endif /* CONFIG_TRACING */
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#endif /* _LINUX_TRACE_SEQ_H */
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