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| author | Petr Mladek <pmladek@suse.cz> | 2014-06-04 16:11:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:54:16 -0700 |
| commit | 85c87043023b7e5535f975bbee12a4f5399df520 (patch) | |
| tree | dd1ad8eb2e43fa09bb06cfff67bd13a6016dc5a0 | |
| parent | f40e4b9f70d48eb08f443642283fdd9d05b27c6d (diff) | |
| download | linux-exynos-85c87043023b7e5535f975bbee12a4f5399df520.tar.gz linux-exynos-85c87043023b7e5535f975bbee12a4f5399df520.tar.bz2 linux-exynos-85c87043023b7e5535f975bbee12a4f5399df520.zip | |
printk: split message size computation
We will want to recompute the message size when shrinking too long
messages. Let's put the code into separate function.
The side effect of setting "pad_len" is not nice but it is worth removing
the code duplication. Note that I will probably have one more usage for
this function when handling messages safe way in NMI context.
This patch does not change the existing behavior.
Signed-off-by: Petr Mladek <pmladek@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/printk/printk.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 8fbbab1771eb..9f088ed8404b 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -339,6 +339,18 @@ static int log_make_free_space(u32 msg_size) return -ENOMEM; } +/* compute the message size including the padding bytes */ +static u32 msg_used_size(u16 text_len, u16 dict_len, u32 *pad_len) +{ + u32 size; + + size = sizeof(struct printk_log) + text_len + dict_len; + *pad_len = (-size) & (LOG_ALIGN - 1); + size += *pad_len; + + return size; +} + /* insert record into the buffer, discard old ones, update heads */ static void log_store(int facility, int level, enum log_flags flags, u64 ts_nsec, @@ -349,9 +361,7 @@ static void log_store(int facility, int level, u32 size, pad_len; /* number of '\0' padding bytes to next message */ - size = sizeof(struct printk_log) + text_len + dict_len; - pad_len = (-size) & (LOG_ALIGN - 1); - size += pad_len; + size = msg_used_size(text_len, dict_len, &pad_len); /* if message does not fit empty log buffer, ignore it */ if (log_make_free_space(size)) |