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[PATCH] Add emergency_restart()
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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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Eric W. Biederman authored and Linus Torvalds committed Jul 26, 2005
1 parent abcd9e5 commit 7c90347
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Showing 27 changed files with 166 additions and 0 deletions.
6 changes: 6 additions & 0 deletions include/asm-alpha/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-arm/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-arm26/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-cris/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-frv/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
9 changes: 9 additions & 0 deletions include/asm-generic/emergency-restart.h
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#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 */
6 changes: 6 additions & 0 deletions include/asm-h8300/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-i386/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-ia64/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-m32r/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-m68k/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-m68knommu/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-mips/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-parisc/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-ppc/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-ppc64/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-s390/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-sh/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-sh64/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-sparc/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-sparc64/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-um/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-v850/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-x86_64/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
6 changes: 6 additions & 0 deletions include/asm-xtensa/emergency-restart.h
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#ifndef _ASM_EMERGENCY_RESTART_H
#define _ASM_EMERGENCY_RESTART_H

#include <asm-generic/emergency-restart.h>

#endif /* _ASM_EMERGENCY_RESTART_H */
7 changes: 7 additions & 0 deletions include/linux/reboot.h
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Expand Up @@ -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 */
6 changes: 6 additions & 0 deletions kernel/sys.c
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Expand Up @@ -361,6 +361,12 @@ asmlinkage long sys_getpriority(int which, int who)
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);
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