While kmsg_bytes can be set for pstore via mount, if a crash occurs
before the mount only partial console log will be stored as kmsg_bytes
defaults to a potentially different hardcoded value in the kernel
(PSTORE_DEFAULT_KMSG_BYTES). This makes it impossible to analyze valuable
post-mortem data especially on the embedded development or in the process
of bringing up new boards. Change this value to be a Kconfig option
with the default of old PSTORE_DEFAULT_KMSG_BYTES
Signed-off-by: Vasile-Laurentiu Stanimir <vasile-laurentiu.stanimir@windriver.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
If you don't have a platform persistent store driver,
say N.
+config PSTORE_DEFAULT_KMSG_BYTES
+ int "Default kernel log storage space" if EXPERT
+ depends on PSTORE
+ default "10240"
+ help
+ Defines default size of pstore kernel log storage.
+ Can be enlarged if needed, not recommended to shrink it.
+
config PSTORE_DEFLATE_COMPRESS
tristate "DEFLATE (ZLIB) compression"
default y
*/
static int pstore_show_options(struct seq_file *m, struct dentry *root)
{
- if (kmsg_bytes != PSTORE_DEFAULT_KMSG_BYTES)
+ if (kmsg_bytes != CONFIG_PSTORE_DEFAULT_KMSG_BYTES)
seq_printf(m, ",kmsg_bytes=%lu", kmsg_bytes);
return 0;
}
#include <linux/time.h>
#include <linux/pstore.h>
-#define PSTORE_DEFAULT_KMSG_BYTES 10240
extern unsigned long kmsg_bytes;
#ifdef CONFIG_PSTORE_FTRACE
static size_t big_oops_buf_sz;
/* How much of the console log to snapshot */
-unsigned long kmsg_bytes = PSTORE_DEFAULT_KMSG_BYTES;
+unsigned long kmsg_bytes = CONFIG_PSTORE_DEFAULT_KMSG_BYTES;
void pstore_set_kmsg_bytes(int bytes)
{