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authorPaul Mackerras <paulus@samba.org>2005-09-10 21:13:13 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-10 10:15:11 -0700
commit31139971b3dc9fbb2e8a8572fb81e6e8470f363a (patch)
tree644fc6833fe6e18d00dbc8b6b281f77e7b923d35 /include/asm-ppc/smp.h
parentbb0bb3b6596cdb08adb0b72453cc67d48e139c2c (diff)
downloadop-kernel-dev-31139971b3dc9fbb2e8a8572fb81e6e8470f363a.zip
op-kernel-dev-31139971b3dc9fbb2e8a8572fb81e6e8470f363a.tar.gz
[PATCH] ppc32: support hotplug cpu on powermacs
This allows cpus to be off-lined on 32-bit SMP powermacs. When a cpu is off-lined, it is put into sleep mode with interrupts disabled. It can be on-lined again by asserting its soft-reset pin, which is connected to a GPIO pin. With this I can off-line the second cpu in my dual G4 powermac, which means that I can then suspend the machine (the suspend/resume code refuses to suspend if more than one cpu is online, and making it cope with multiple cpus is surprisingly messy). Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ppc/smp.h')
-rw-r--r--include/asm-ppc/smp.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-ppc/smp.h b/include/asm-ppc/smp.h
index 17530c2..829481c 100644
--- a/include/asm-ppc/smp.h
+++ b/include/asm-ppc/smp.h
@@ -41,6 +41,10 @@ extern void smp_send_xmon_break(int cpu);
struct pt_regs;
extern void smp_message_recv(int, struct pt_regs *);
+extern int __cpu_disable(void);
+extern void __cpu_die(unsigned int cpu);
+extern void cpu_die(void) __attribute__((noreturn));
+
#define NO_PROC_ID 0xFF /* No processor magic marker */
#define PROC_CHANGE_PENALTY 20
@@ -64,6 +68,8 @@ extern struct klock_info_struct klock_info;
#else /* !(CONFIG_SMP) */
+static inline void cpu_die(void) { }
+
#endif /* !(CONFIG_SMP) */
#endif /* !(_PPC_SMP_H) */
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