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authorPetr Mladek <pmladek@suse.cz>2014-06-04 16:11:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:54:16 -0700
commit85c87043023b7e5535f975bbee12a4f5399df520 (patch)
treedd1ad8eb2e43fa09bb06cfff67bd13a6016dc5a0
parentf40e4b9f70d48eb08f443642283fdd9d05b27c6d (diff)
downloadlinux-85c87043023b7e5535f975bbee12a4f5399df520.tar.bz2
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.c16
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))