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[PATCH] Disable CPU hotplug during suspend

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The current suspend code has to be run on one CPU, so we use the CPU
hotplug to take the non-boot CPUs offline on SMP machines.  However, we
should also make sure that these CPUs will not be enabled by someone else
after we have disabled them.

The functions disable_nonboot_cpus() and enable_nonboot_cpus() are moved to
kernel/cpu.c, because they now refer to some stuff in there that should
better be static.  Also it's better if disable_nonboot_cpus() returns an
error instead of panicking if something goes wrong, and
enable_nonboot_cpus() has no reason to panic(), because the CPUs may have
been enabled by the userland before it tries to take them online.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki 2006-09-25 23:32:48 -07:00 • committed by Linus Torvalds
parent e8eff5ac29
commit e3920fb42c
8 changed files with 146 additions and 105 deletions
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8
include/linux/cpu.h
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@ -89,4 +89,12 @@ int cpu_down(unsigned int cpu);
static inline int cpu_is_offline(int cpu) { return 0; }
#endif
#ifdef CONFIG_SUSPEND_SMP
extern int disable_nonboot_cpus(void);
extern void enable_nonboot_cpus(void);
#else
static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
#endif
#endif /* _LINUX_CPU_H_ */