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authorNeil Horman <nhorman@tuxdriver.com>2009-04-02 16:58:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:05:04 -0700
commit04d491ab2a53008a1aa98ac09561768c7f3adda3 (patch)
treeab8fff6fb8674c8061b733ce64d6d6fba9d68ff3
parent23c36c1aec895fd52d7dd8cd3ce4bbce43c969fd (diff)
downloadlinux-04d491ab2a53008a1aa98ac09561768c7f3adda3.tar.bz2
kexec: add dmesg log symbols to /proc/vmcoreinfo lists
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. [akpm@linux-foundation.org: several fixes and cleanups] [akpm@linux-foundation.org: fix unused log_buf_kexec_setup()] [akpm@linux-foundation.org: build fix] Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Cc: Simon Horman <horms@verge.net.au> Acked-by: Vivek Goyal <vgoyal@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Simon Horman <horms@verge.net.au> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/kernel.h4
-rw-r--r--kernel/kexec.c1
-rw-r--r--kernel/printk.c19
3 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e720b0da7751..556d781e69fe 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -242,6 +242,7 @@ extern struct ratelimit_state printk_ratelimit_state;
extern int printk_ratelimit(void);
extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
unsigned int interval_msec);
+void log_buf_kexec_setup(void);
#else
static inline int vprintk(const char *s, va_list args)
__attribute__ ((format (printf, 1, 0)));
@@ -253,6 +254,9 @@ static inline int printk_ratelimit(void) { return 0; }
static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
unsigned int interval_msec) \
{ return false; }
+static inline void log_buf_kexec_setup(void)
+{
+}
#endif
extern int printk_needs_cpu(int cpu);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 93eed85fe017..589832aac41f 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1409,6 +1409,7 @@ static int __init crash_save_vmcoreinfo_init(void)
VMCOREINFO_OFFSET(list_head, prev);
VMCOREINFO_OFFSET(vm_struct, addr);
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+ log_buf_kexec_setup();
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
VMCOREINFO_NUMBER(NR_FREE_PAGES);
VMCOREINFO_NUMBER(PG_lru);
diff --git a/kernel/printk.c b/kernel/printk.c
index e3602d0755b0..a5f61a9acedb 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -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);