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| author | Joe Perches <joe@perches.com> | 2012-07-30 14:40:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:14 -0700 |
| commit | 04d2c8c83d0e3ac5f78aeede51babb3236200112 (patch) | |
| tree | c32b6197f9487cc18f00e85bdfb935a7a6a92477 /include/linux/printk.h | |
| parent | b778b3f25baf46dd88f16d51f1682828be0aa2ad (diff) | |
| download | linux-04d2c8c83d0e3ac5f78aeede51babb3236200112.tar.gz linux-04d2c8c83d0e3ac5f78aeede51babb3236200112.tar.bz2 linux-04d2c8c83d0e3ac5f78aeede51babb3236200112.zip | |
printk: convert the format for KERN_<LEVEL> to a 2 byte pattern
Instead of "<.>", use an ASCII SOH for the KERN_<LEVEL> prefix initiator.
This saves 1 byte per printk, thousands of bytes in a normal kernel.
No output changes are produced as vprintk_emit converts these uses to
"<.>".
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/printk.h')
| -rw-r--r-- | include/linux/printk.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h index fea2de37b645..93a231f9835c 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -9,7 +9,7 @@ extern const char linux_proc_banner[]; static inline int printk_get_level(const char *buffer) { - if (buffer[0] == '<' && buffer[1] && buffer[2] == '>') { + if (buffer[0] == KERN_SOH_ASCII && buffer[1]) { switch (buffer[1]) { case '0' ... '7': case 'd': /* KERN_DEFAULT */ @@ -27,7 +27,7 @@ static inline const char *printk_skip_level(const char *buffer) case '0' ... '7': case 'd': /* KERN_DEFAULT */ case 'c': /* KERN_CONT */ - return buffer + 3; + return buffer + 2; } } return buffer; |