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printk: add generic functions to find KERN_<LEVEL> headers

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The current form of a KERN_<LEVEL> is "<.>".

Add printk_get_level and printk_skip_level functions to handle these
formats.

These functions centralize tests of KERN_<LEVEL> so a future modification
can change the KERN_<LEVEL> style and shorten the number of bytes consumed
by these headers.

[akpm@linux-foundation.org: fix build error and warning]
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2012-07-30 14:40:09 -07:00 committed by Linus Torvalds
parent cdf5344136
commit acc8fa41ad
2 changed files with 35 additions and 5 deletions
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26
include/linux/printk.h
View File

@ -24,6 +24,32 @@ extern const char linux_proc_banner[];
*/
#define KERN_CONT "<c>"
static inline int printk_get_level(const char *buffer)
{
if (buffer[0] == '<' && buffer[1] && buffer[2] == '>') {
switch (buffer[1]) {
case '0' ... '7':
case 'd': /* KERN_DEFAULT */
case 'c': /* KERN_CONT */
return buffer[1];
}
}
return 0;
}
static inline const char *printk_skip_level(const char *buffer)
{
if (printk_get_level(buffer)) {
switch (buffer[1]) {
case '0' ... '7':
case 'd': /* KERN_DEFAULT */
case 'c': /* KERN_CONT */
return buffer + 3;
}
}
return buffer;
}
extern int console_printk[];
#define console_loglevel (console_printk[0])

14
kernel/printk.c
View File

@ -1487,6 +1487,7 @@ asmlinkage int vprintk_emit(int facility, int level,
size_t text_len;
enum log_flags lflags = 0;
unsigned long flags;
int kern_level;
int this_cpu;
int printed_len = 0;
@ -1543,17 +1544,20 @@ asmlinkage int vprintk_emit(int facility, int level,
}
/* strip syslog prefix and extract log level or control flags */
if (text[0] == '<' && text[1] && text[2] == '>') {
switch (text[1]) {
kern_level = printk_get_level(text);
if (kern_level) {
const char *end_of_header = printk_skip_level(text);
switch (kern_level) {
case '0' ... '7':
if (level == -1)
level = text[1] - '0';
level = kern_level - '0';
case 'd': /* KERN_DEFAULT */
lflags |= LOG_PREFIX;
case 'c': /* KERN_CONT */
text += 3;
text_len -= 3;
break;
}
text_len -= end_of_header - text;
text = (char *)end_of_header;
}
if (level == -1)