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kexec: add dmesg log symbols to /proc/vmcoreinfo lists

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It would be nice to be able to extract the dmesg log from a vmcore file
without needing to keep the debug symbols for the running kernel handy all
the time.  We have a facility to do this in /proc/vmcore.  This patch adds
the log_buf and log_end symbols to the vmcoreinfo area so that tools (like
makedumpfile) can easily extract the dmesg logs from a vmcore image.

[[email protected]: several fixes and cleanups]
[[email protected]: fix unused log_buf_kexec_setup()]
[[email protected]: build fix]
Signed-off-by: Neil Horman <[email protected]>
Cc: Simon Horman <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Cc: Neil Horman <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Neil Horman 2009-04-02 16:58:57 -07:00 • committed by Linus Torvalds
commit 04d491ab2a
3 changed files with 24 additions and 0 deletions
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19
kernel/printk.c
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@ -32,6 +32,7 @@
#include <linux/security.h>
#include <linux/bootmem.h>
#include <linux/syscalls.h>
#include <linux/kexec.h>
#include <asm/uaccess.h>
@ -135,6 +136,24 @@ static char *log_buf = __log_buf;
static int log_buf_len = __LOG_BUF_LEN;
static unsigned logged_chars; /* Number of chars produced since last read+clear operation */
#ifdef CONFIG_KEXEC
/*
* This appends the listed symbols to /proc/vmcoreinfo
*
* /proc/vmcoreinfo is used by various utiilties, like crash and makedumpfile to
* obtain access to symbols that are otherwise very difficult to locate. These
* symbols are specifically used so that utilities can access and extract the
* dmesg log from a vmcore file after a crash.
*/
void log_buf_kexec_setup(void)
{
VMCOREINFO_SYMBOL(log_buf);
VMCOREINFO_SYMBOL(log_end);
VMCOREINFO_SYMBOL(log_buf_len);
VMCOREINFO_SYMBOL(logged_chars);
}
#endif
static int __init log_buf_len_setup(char *str)
{
unsigned size = memparse(str, &str);