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printk: Remove print_prefix() calls with NULL buffer.

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We can save lines/size by removing print_prefix() with buf == NULL.
This patch makes no functional change.

Link: http://lkml.kernel.org/r/1544521745-11925-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Tetsuo Handa 2018-12-11 18:49:05 +09:00 committed by Petr Mladek
parent e80c1a9d5f
commit 07c17732bd
1 changed files with 14 additions and 25 deletions
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39
kernel/printk/printk.c
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@ -1228,13 +1228,15 @@ static inline void boot_delay_msec(int level)
static bool printk_time = IS_ENABLED(CONFIG_PRINTK_TIME);
module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);
static size_t print_syslog(unsigned int level, char *buf)
{
return sprintf(buf, "<%u>", level);
}
static size_t print_time(u64 ts, char *buf)
{
unsigned long rem_nsec = do_div(ts, 1000000000);
if (!buf)
return snprintf(NULL, 0, "[%5lu.000000] ", (unsigned long)ts);
return sprintf(buf, "[%5lu.%06lu] ",
(unsigned long)ts, rem_nsec / 1000);
}
@ -1243,24 +1245,11 @@ static size_t print_prefix(const struct printk_log *msg, bool syslog,
bool time, char *buf)
{
size_t len = 0;
unsigned int prefix = (msg->facility << 3) | msg->level;
if (syslog) {
if (buf) {
len += sprintf(buf, "<%u>", prefix);
} else {
len += 3;
if (prefix > 999)
len += 3;
else if (prefix > 99)
len += 2;
else if (prefix > 9)
len++;
}
}
if (syslog)
len = print_syslog((msg->facility << 3) | msg->level, buf);
if (time)
len += print_time(msg->ts_nsec, buf ? buf + len : NULL);
len += print_time(msg->ts_nsec, buf + len);
return len;
}
@ -1270,6 +1259,8 @@ static size_t msg_print_text(const struct printk_log *msg, bool syslog,
const char *text = log_text(msg);
size_t text_size = msg->text_len;
size_t len = 0;
char prefix[PREFIX_MAX];
const size_t prefix_len = print_prefix(msg, syslog, time, prefix);
do {
const char *next = memchr(text, '\n', text_size);
@ -1284,19 +1275,17 @@ static size_t msg_print_text(const struct printk_log *msg, bool syslog,
}
if (buf) {
if (print_prefix(msg, syslog, time, NULL) +
text_len + 1 >= size - len)
if (prefix_len + text_len + 1 >= size - len)
break;
len += print_prefix(msg, syslog, time, buf + len);
memcpy(buf + len, prefix, prefix_len);
len += prefix_len;
memcpy(buf + len, text, text_len);
len += text_len;
buf[len++] = '\n';
} else {
/* SYSLOG_ACTION_* buffer size only calculation */
len += print_prefix(msg, syslog, time, NULL);
len += text_len;
len++;
len += prefix_len + text_len + 1;
}
text = next;