Petr Mladek 39b25109b4 printk: use also the last bytes in the ring buffer ... It seems that we have newer used the last byte in the ring buffer. In fact, we have newer used the last 4 bytes because of padding. First problem is in the check for free space. The exact number of free bytes is enough to store the length of data. Second problem is in the check where the ring buffer is rotated. The left side counts the first unused index. It is unused, so it might be the same as the size of the buffer. Note that the first problem has to be fixed together with the second one. Otherwise, the buffer is rotated even when there is enough space on the end of the buffer. Then the beginning of the buffer is rewritten and valid entries get corrupted. Signed-off-by: Petr Mladek <pmladek@suse.cz> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jan Kara <jack@suse.cz> Cc: Michal Hocko <mhocko@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>		2014-04-03 16:21:07 -07:00
..
braille.c	printk: Fix return of braille_register_console()	2013-08-06 13:18:12 -07:00
braille.h	printk: move braille console support into separate braille.[ch] files	2013-07-31 14:41:03 -07:00
console_cmdline.h
Makefile	printk: move braille console support into separate braille.[ch] files	2013-07-31 14:41:03 -07:00
printk.c	printk: use also the last bytes in the ring buffer	2014-04-03 16:21:07 -07:00