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Subject[PATCH v2 4/4] printk: miscellaneous cleanups
Date
This patch contains 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>
---
kernel/printk/printk.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 6f75e8a..909029e 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -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)
@@ -1794,7 +1795,7 @@ 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;
@@ -1895,7 +1896,8 @@ 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"))
@@ -1904,7 +1906,7 @@ 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;
@@ -1943,7 +1945,6 @@ 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;
@@ -2611,14 +2612,13 @@ 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);

--
1.9.1


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