From: ebiederm@xmission.com (Eric W. Biederman)
To: Andrew Morton <akpm@osdl.org>
Cc: Linus Torvalds <torvalds@osdl.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 4/23] Add emergency_restart()
Date: Tue, 26 Jul 2005 11:29:55 -0600 [thread overview]
Message-ID: <m164uxear0.fsf_-_@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <m1ack9eaux.fsf_-_@ebiederm.dsl.xmission.com> (Eric W. Biederman's message of "Tue, 26 Jul 2005 11:27:34 -0600")
When the kernel is working well and we want to restart cleanly
kernel_restart is the function to use. But in many instances
the kernel wants to reboot when thing are expected to be working
very badly such as from panic or a software watchdog handler.
This patch adds the function emergency_restart() so that
callers can be clear what semantics they expect when calling
restart. emergency_restart() is expected to be callable
from interrupt context and possibly reliable in even more
trying circumstances.
This is an initial generic implementation for all architectures.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
include/asm-alpha/emergency-restart.h | 6 ++++++
include/asm-arm/emergency-restart.h | 6 ++++++
include/asm-arm26/emergency-restart.h | 6 ++++++
include/asm-cris/emergency-restart.h | 6 ++++++
include/asm-frv/emergency-restart.h | 6 ++++++
include/asm-generic/emergency-restart.h | 9 +++++++++
include/asm-h8300/emergency-restart.h | 6 ++++++
include/asm-i386/emergency-restart.h | 6 ++++++
include/asm-ia64/emergency-restart.h | 6 ++++++
include/asm-m32r/emergency-restart.h | 6 ++++++
include/asm-m68k/emergency-restart.h | 6 ++++++
include/asm-m68knommu/emergency-restart.h | 6 ++++++
include/asm-mips/emergency-restart.h | 6 ++++++
include/asm-parisc/emergency-restart.h | 6 ++++++
include/asm-ppc/emergency-restart.h | 6 ++++++
include/asm-ppc64/emergency-restart.h | 6 ++++++
include/asm-s390/emergency-restart.h | 6 ++++++
include/asm-sh/emergency-restart.h | 6 ++++++
include/asm-sh64/emergency-restart.h | 6 ++++++
include/asm-sparc/emergency-restart.h | 6 ++++++
include/asm-sparc64/emergency-restart.h | 6 ++++++
include/asm-um/emergency-restart.h | 6 ++++++
include/asm-v850/emergency-restart.h | 6 ++++++
include/asm-x86_64/emergency-restart.h | 6 ++++++
include/asm-xtensa/emergency-restart.h | 6 ++++++
include/linux/reboot.h | 7 +++++++
kernel/sys.c | 6 ++++++
27 files changed, 166 insertions(+), 0 deletions(-)
create mode 100644 include/asm-alpha/emergency-restart.h
create mode 100644 include/asm-arm/emergency-restart.h
create mode 100644 include/asm-arm26/emergency-restart.h
create mode 100644 include/asm-cris/emergency-restart.h
create mode 100644 include/asm-frv/emergency-restart.h
create mode 100644 include/asm-generic/emergency-restart.h
create mode 100644 include/asm-h8300/emergency-restart.h
create mode 100644 include/asm-i386/emergency-restart.h
create mode 100644 include/asm-ia64/emergency-restart.h
create mode 100644 include/asm-m32r/emergency-restart.h
create mode 100644 include/asm-m68k/emergency-restart.h
create mode 100644 include/asm-m68knommu/emergency-restart.h
create mode 100644 include/asm-mips/emergency-restart.h
create mode 100644 include/asm-parisc/emergency-restart.h
create mode 100644 include/asm-ppc/emergency-restart.h
create mode 100644 include/asm-ppc64/emergency-restart.h
create mode 100644 include/asm-s390/emergency-restart.h
create mode 100644 include/asm-sh/emergency-restart.h
create mode 100644 include/asm-sh64/emergency-restart.h
create mode 100644 include/asm-sparc/emergency-restart.h
create mode 100644 include/asm-sparc64/emergency-restart.h
create mode 100644 include/asm-um/emergency-restart.h
create mode 100644 include/asm-v850/emergency-restart.h
create mode 100644 include/asm-x86_64/emergency-restart.h
create mode 100644 include/asm-xtensa/emergency-restart.h
3d8ea7bd8df5d92589d8e02f45b979073c855848
diff --git a/include/asm-alpha/emergency-restart.h b/include/asm-alpha/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-alpha/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-arm/emergency-restart.h b/include/asm-arm/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-arm/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-arm26/emergency-restart.h b/include/asm-arm26/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-arm26/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-cris/emergency-restart.h b/include/asm-cris/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-cris/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-frv/emergency-restart.h b/include/asm-frv/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-frv/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-generic/emergency-restart.h b/include/asm-generic/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-generic/emergency-restart.h
@@ -0,0 +1,9 @@
+#ifndef _ASM_GENERIC_EMERGENCY_RESTART_H
+#define _ASM_GENERIC_EMERGENCY_RESTART_H
+
+static inline void machine_emergency_restart(void)
+{
+ machine_restart(NULL);
+}
+
+#endif /* _ASM_GENERIC_EMERGENCY_RESTART_H */
diff --git a/include/asm-h8300/emergency-restart.h b/include/asm-h8300/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-h8300/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-i386/emergency-restart.h b/include/asm-i386/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-i386/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-ia64/emergency-restart.h b/include/asm-ia64/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-ia64/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-m32r/emergency-restart.h b/include/asm-m32r/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-m32r/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-m68k/emergency-restart.h b/include/asm-m68k/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-m68k/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-m68knommu/emergency-restart.h b/include/asm-m68knommu/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-m68knommu/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-mips/emergency-restart.h b/include/asm-mips/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-mips/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-parisc/emergency-restart.h b/include/asm-parisc/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-parisc/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-ppc/emergency-restart.h b/include/asm-ppc/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-ppc/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-ppc64/emergency-restart.h b/include/asm-ppc64/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-ppc64/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-s390/emergency-restart.h b/include/asm-s390/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-s390/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-sh/emergency-restart.h b/include/asm-sh/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-sh/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-sh64/emergency-restart.h b/include/asm-sh64/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-sh64/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-sparc/emergency-restart.h b/include/asm-sparc/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-sparc/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-sparc64/emergency-restart.h b/include/asm-sparc64/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-sparc64/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-um/emergency-restart.h b/include/asm-um/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-um/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-v850/emergency-restart.h b/include/asm-v850/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-v850/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-x86_64/emergency-restart.h b/include/asm-x86_64/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-x86_64/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/asm-xtensa/emergency-restart.h b/include/asm-xtensa/emergency-restart.h
new file mode 100644
--- /dev/null
+++ b/include/asm-xtensa/emergency-restart.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_EMERGENCY_RESTART_H
+#define _ASM_EMERGENCY_RESTART_H
+
+#include <asm-generic/emergency-restart.h>
+
+#endif /* _ASM_EMERGENCY_RESTART_H */
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -64,6 +64,13 @@ extern void kernel_halt(void);
extern void kernel_power_off(void);
extern void kernel_kexec(void);
+/*
+ * Emergency restart, callable from an interrupt handler.
+ */
+
+extern void emergency_restart(void);
+#include <asm/emergency-restart.h>
+
#endif
#endif /* _LINUX_REBOOT_H */
diff --git a/kernel/sys.c b/kernel/sys.c
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -361,6 +361,12 @@ out_unlock:
return retval;
}
+void emergency_restart(void)
+{
+ machine_emergency_restart();
+}
+EXPORT_SYMBOL_GPL(emergency_restart);
+
void kernel_restart(char *cmd)
{
notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
next prev parent reply other threads:[~2005-07-26 17:31 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-26 17:19 [PATCH 0/23] reboot-fixes Eric W. Biederman
2005-07-26 17:21 ` [PATCH 1/23] Add missing device_suspsend(PMSG_FREEZE) calls Eric W. Biederman
2005-07-26 17:24 ` [PATCH 2/23] Refactor sys_reboot into reusable parts Eric W. Biederman
2005-07-26 17:27 ` [PATCH 3/23] Make ctrl_alt_del call kernel_restart to get a proper reboot Eric W. Biederman
2005-07-26 17:29 ` Eric W. Biederman [this message]
2005-07-26 17:32 ` [PATCH 5/23] Fix the arguments to machine_restart on cris Eric W. Biederman
2005-07-26 17:36 ` [PATCH 6/23] Don't export machine_restart, machine_halt, or machine_power_off Eric W. Biederman
2005-07-26 17:41 ` [PATCH 7/23] i386: Implement machine_emergency_reboot Eric W. Biederman
2005-07-26 17:44 ` [PATCH 8/23] x86_64: Fix reboot_force Eric W. Biederman
2005-07-26 17:45 ` [PATCH 9/23] x86_64: Implemenent machine_emergency_restart Eric W. Biederman
2005-07-26 17:47 ` [PATCH 10/23] Use kernel_power_off in sysrq-o Eric W. Biederman
2005-07-26 17:49 ` [PATCH 11/23] Call emergency_reboot from panic Eric W. Biederman
2005-07-26 17:51 ` [PATCH 12/23] Update sysrq-B to use emergency_restart() Eric W. Biederman
2005-07-26 17:53 ` [PATCH 13/23] Fix watchdog drivers to call emergency_reboot() Eric W. Biederman
2005-07-26 17:55 ` [PATCH 14/23] In hangcheck-timer.c call emergency_restart() Eric W. Biederman
2005-07-26 17:59 ` [PATCH 15/23] 68328serial: sysrq should use emergency_reboot Eric W. Biederman
2005-07-26 18:01 ` [PATCH 16/23] swpsuspend: Have suspend to disk use factors of sys_reboot Eric W. Biederman
2005-07-26 18:03 ` [PATCH 17/23] pcwd.c: Call kernel_power_off not machine_power_off Eric W. Biederman
2005-07-26 18:07 ` [PATCH 18/23] machine_shutdown: Typo fix to actually allow specifying which cpu to reboot on Eric W. Biederman
2005-07-26 18:08 ` [PATCH 19/23] i386 machine_power_off cleanup Eric W. Biederman
2005-07-26 18:10 ` [PATCH 20/23] APM: Remove redundant call to set_cpus_allowed Eric W. Biederman
2005-07-26 18:14 ` [PATCH 21/23] x86_64 sync machine_power_off with i386 Eric W. Biederman
2005-07-26 18:16 ` [PATCH 22/23] acpi_power_off: Don't switch to the boot cpu Eric W. Biederman
2005-07-26 18:17 ` [PATCH 23/23] acpi: Don't call acpi_sleep_prepare from acpi_power_off Eric W. Biederman
2005-07-26 20:57 ` [PATCH 16/23] swpsuspend: Have suspend to disk use factors of sys_reboot Andrew Morton
2005-07-26 21:02 ` Pavel Machek
2005-07-26 23:55 ` [PATCH 6/23] Don't export machine_restart, machine_halt, or machine_power_off Marc Ballarin
2005-07-27 0:20 ` Eric W. Biederman
2005-07-27 0:26 ` Andrew Morton
2005-07-27 0:31 ` Linus Torvalds
2005-07-26 17:54 ` [PATCH 1/23] Add missing device_suspsend(PMSG_FREEZE) calls Nigel Cunningham
2005-07-28 1:12 ` Eric W. Biederman
2005-07-28 2:21 ` [linux-pm] " david-b
2005-07-28 2:44 ` Shaohua Li
2005-07-26 20:08 ` [PATCH 0/23] reboot-fixes Pavel Machek
2005-07-27 9:59 ` Andrew Morton
2005-07-27 15:32 ` Eric W. Biederman
2005-07-27 15:56 ` Eric W. Biederman
2005-07-27 17:41 ` Andrew Morton
2005-07-27 18:15 ` Eric W. Biederman
2005-07-27 18:17 ` Eric W. Biederman
2005-07-27 18:29 ` Andrew Morton
2005-07-27 18:43 ` Eric W. Biederman
2005-07-27 22:47 ` Pavel Machek
2005-07-27 22:51 ` Andrew Morton
2005-07-27 22:54 ` Pavel Machek
2005-08-04 3:24 ` Nigel Cunningham
2005-08-04 21:45 ` Pavel Machek
2005-08-04 22:16 ` Nigel Cunningham
[not found] ` <m1ackah4r3.fsf@ebiederm.dsl.xmission.com>
[not found] ` <20050725161548.274d3d67.akpm@osdl.org>
[not found] ` <dnpst4v5px.fsf@magla.zg.iskon.hr>
[not found] ` <m1oe8o9stl.fsf@ebiederm.dsl.xmission.com>
[not found] ` <dny87s6oe9.fsf@magla.zg.iskon.hr>
[not found] ` <m1r7dk82a4.fsf@ebiederm.dsl.xmission.com>
[not found] ` <42E8439E.9030103@ribosome.natur.cuni.cz>
[not found] ` <20050727193911.2cb4df88.akpm@osdl.org>
[not found] ` <42F121CD.5070903@ribosome.natur.cuni.cz>
[not found] ` <20050803200514.3ddb8195.akpm@osdl.org>
[not found] ` <20050805140837.GA5556@localhost>
[not found] ` <42F52AC5.1060109@ribosome.natur.cuni.cz>
[not found] ` <m1hde2xy74.fsf@ebiederm.dsl.xmission.com>
2005-08-07 12:48 ` FYI: device_suspend(...) in kernel_power_off() Eric W. Biederman
2005-08-07 19:02 ` Pavel Machek
2005-08-07 19:46 ` Eric W. Biederman
2005-08-07 21:11 ` Pavel Machek
2005-08-09 17:25 ` Eric W. Biederman
2005-08-09 21:29 ` Nigel Cunningham
2005-08-10 13:08 ` Pavel Machek
2005-07-27 22:51 ` [PATCH 0/23] reboot-fixes Linus Torvalds
2005-07-27 22:53 ` Pavel Machek
2005-07-27 23:20 ` Eric W. Biederman
2005-07-28 7:43 ` Pavel Machek
2005-07-28 14:54 ` Eric W. Biederman
2005-07-29 3:11 ` Eric W. Biederman
2005-07-27 23:07 ` Eric W. Biederman
2005-07-28 7:42 ` Pavel Machek
2005-07-29 3:12 ` Eric W. Biederman
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