tree a1d7946374dc6db660ffbf76a1ae862c629566d1
parent 2520f14ca85e38f575eed6acc6e586df246abea6
author Guillaume Chazarain <guichaz@yahoo.fr> 1136710961 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1136780032 -0800

[PATCH] printk return value: fix it

What's the true meaning of the printk return value?  Should it include the
priority prefix length of 3?  and what about the timing information?  In
both cases it was broken:

strace -e write echo 1 > /dev/kmsg
=> write(1, "1\n", 2)                      = 5
strace -e write echo "<1>1" > /dev/kmsg
=> write(1, "<1>1\n", 5)                   = 8

The returned length was "length of input string + 3", I made it "length
of string output to the log buffer".

Note that I couldn't find any printk caller in the kernel interested by its
return value besides kmsg_write.

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Acked-By: Tim Bird <tim.bird@am.sony.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>