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printk: miscellaneous cleanups 

Some small cleanups to kernel/printk/printk.c.  None of them should
cause any change in behavior.

  - When CONFIG_PRINTK is defined, parenthesize the value of LOG_LINE_MAX.
  - When CONFIG_PRINTK is *not* defined, there is an extra LOG_LINE_MAX
    definition; delete it.
  - Pull an assignment out of a conditional expression in console_setup().
  - Use isdigit() in console_setup() rather than open coding it.
  - In update_console_cmdline(), drop a NUL-termination assignment;
    the strlcpy() call that precedes it guarantees it's not needed.
  - Simplify some logic in printk_timed_ratelimit().

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Jan Kara <jack@suse.cz>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Elder 2014-08-06 16:09:08 -07:00 committed by Linus Torvalds
parent e99aa46166
commit 249771b830
1 changed files with 13 additions and 13 deletions
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26
kernel/printk/printk.c
View File

@ -45,6 +45,7 @@
#include <linux/poll.h>
#include <linux/irq_work.h>
#include <linux/utsname.h>
#include <linux/ctype.h>
#include <asm/uaccess.h>
@ -257,7 +258,7 @@ static u64 clear_seq;
static u32 clear_idx;
#define PREFIX_MAX 32
#define LOG_LINE_MAX 1024 - PREFIX_MAX
#define LOG_LINE_MAX (1024 - PREFIX_MAX)
/* record buffer */
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
@ -1835,7 +1836,7 @@ EXPORT_SYMBOL(printk);
#define LOG_LINE_MAX 0
#define PREFIX_MAX 0
#define LOG_LINE_MAX 0
static u64 syslog_seq;
static u32 syslog_idx;
static u64 console_seq;
@ -1936,7 +1937,8 @@ static int __init console_setup(char *str)
strncpy(buf, str, sizeof(buf) - 1);
}
buf[sizeof(buf) - 1] = 0;
if ((options = strchr(str, ',')) != NULL)
options = strchr(str, ',');
if (options)
*(options++) = 0;
#ifdef __sparc__
if (!strcmp(str, "ttya"))
@ -1945,7 +1947,7 @@ static int __init console_setup(char *str)
strcpy(buf, "ttyS1");
#endif
for (s = buf; *s; s++)
if ((*s >= '0' && *s <= '9') || *s == ',')
if (isdigit(*s) || *s == ',')
break;
idx = simple_strtoul(s, NULL, 10);
*s = 0;
@ -1984,7 +1986,6 @@ int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, cha
i++, c++)
if (strcmp(c->name, name) == 0 && c->index == idx) {
strlcpy(c->name, name_new, sizeof(c->name));
c->name[sizeof(c->name) - 1] = 0;
c->options = options;
c->index = idx_new;
return i;
@ -2652,14 +2653,13 @@ EXPORT_SYMBOL(__printk_ratelimit);
bool printk_timed_ratelimit(unsigned long *caller_jiffies,
unsigned int interval_msecs)
{
if (*caller_jiffies == 0
|| !time_in_range(jiffies, *caller_jiffies,
*caller_jiffies
+ msecs_to_jiffies(interval_msecs))) {
*caller_jiffies = jiffies;
return true;
}
return false;
unsigned long elapsed = jiffies - *caller_jiffies;
if (*caller_jiffies && elapsed <= msecs_to_jiffies(interval_msecs))
return false;
*caller_jiffies = jiffies;
return true;
}
EXPORT_SYMBOL(printk_timed_ratelimit);