kexec: remove KMSG_DUMP_KEXEC

BugLink: http://bugs.launchpad.net/bugs/944772

KMSG_DUMP_KEXEC is useless because we already save kernel messages inside
/proc/vmcore, and it is unsafe to allow modules to do other stuffs in a
crash dump scenario.

[akpm@linux-foundation.org: fix powerpc build]
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Reported-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit a3dd3323058d281abd584b15ad4c5b65064d7a61)
Acked-by: Colin King <colin.king@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index a76b228..bd4861b 100644 (file)
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -636,7 +636,6 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
                /* These are almost always orderly shutdowns. */
                return;
        case KMSG_DUMP_OOPS:
-       case KMSG_DUMP_KEXEC:
                break;
        case KMSG_DUMP_PANIC:
                panicking = true;

diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 7c7f42a..feda90c 100644 (file)
--- a/drivers/char/ramoops.c
+++ b/drivers/char/ramoops.c
@@ -83,8 +83,7 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper,
        struct timeval timestamp;
 
        if (reason != KMSG_DUMP_OOPS &&
-           reason != KMSG_DUMP_PANIC &&
-           reason != KMSG_DUMP_KEXEC)
+           reason != KMSG_DUMP_PANIC)
                return;
 
        /* Only dump oopses if dump_oops is set */

diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index f3cdce9..b7883e5 100644 (file)
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -311,8 +311,7 @@ static void mtdoops_do_dump(struct kmsg_dumper *dumper,
        char *dst;
 
        if (reason != KMSG_DUMP_OOPS &&
-           reason != KMSG_DUMP_PANIC &&
-           reason != KMSG_DUMP_KEXEC)
+           reason != KMSG_DUMP_PANIC)
                return;
 
        /* Only dump oopses if dump_oops is set */

diff --git a/include/linux/kmsg_dump.h b/include/linux/kmsg_dump.h
index ee0c952..fee6631 100644 (file)
--- a/include/linux/kmsg_dump.h
+++ b/include/linux/kmsg_dump.h
@@ -18,7 +18,6 @@
 enum kmsg_dump_reason {
        KMSG_DUMP_OOPS,
        KMSG_DUMP_PANIC,
-       KMSG_DUMP_KEXEC,
        KMSG_DUMP_RESTART,
        KMSG_DUMP_HALT,
        KMSG_DUMP_POWEROFF,

diff --git a/kernel/kexec.c b/kernel/kexec.c
index dc7bc08..dc535d7 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -32,7 +32,6 @@
 #include <linux/console.h>
 #include <linux/vmalloc.h>
 #include <linux/swap.h>
-#include <linux/kmsg_dump.h>
 #include <linux/syscore_ops.h>
 
 #include <asm/page.h>
@@ -1094,8 +1093,6 @@ void crash_kexec(struct pt_regs *regs)
                if (kexec_crash_image) {
                        struct pt_regs fixed_regs;
 
-                       kmsg_dump(KMSG_DUMP_KEXEC);
-
                        crash_setup_regs(&fixed_regs, regs);
                        crash_save_vmcoreinfo();
                        machine_crash_shutdown(&fixed_regs);