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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-09-25 23:32:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:48:59 -0700 |
| commit | e3920fb42c8ddfe63befb54d95c0e13eabacea9b (patch) | |
| tree | 08371a71e58e6e9d3ec62dfa6a22b3b5e6ff0fd5 /include/linux/cpu.h | |
| parent | e8eff5ac294e12531c4195e0c15a222d3c9015e5 (diff) | |
| download | lwn-e3920fb42c8ddfe63befb54d95c0e13eabacea9b.tar.gz lwn-e3920fb42c8ddfe63befb54d95c0e13eabacea9b.zip | |
[PATCH] Disable CPU hotplug during suspend
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>
Diffstat (limited to 'include/linux/cpu.h')
| -rw-r--r-- | include/linux/cpu.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 8fb344a9abd8..3fef7d67aedc 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -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_ */ |