diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2002-07-26 01:28:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@penguin.transmeta.com> | 2002-07-26 01:28:07 -0700 |
| commit | c5e062079a7090891ea5cd1b23a7eab52b156b2a (patch) | |
| tree | b3ed0870f22e6375a39dada4d8d37ea2a94fcfa9 /include/linux/smp.h | |
| parent | e1eec525be1b708894650a4573d6d7f61e96c4fa (diff) | |
[PATCH] Hot-plug CPU Boot Changes
This patch alters the boot sequence to "plug in" each CPU, one at a
time. You need the patch for each architecture, as well. The
interface used to be "smp_boot_cpus()", "smp_commence()", and each
arch implemented the "maxcpus" boot arg itself. With this patch,
it is:
smp_prepare_cpus(maxcpus): probe for cpus and set up cpu_possible(cpu).
__cpu_up(cpu): called *after* initcalls, for each cpu where
cpu_possible(cpu) is true.
smp_cpus_done(maxcpus): called after every cpu has been brought up
Diffstat (limited to 'include/linux/smp.h')
| -rw-r--r-- | include/linux/smp.h | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h index d6857a229d5d..454fdcdf14d2 100644 --- a/include/linux/smp.h +++ b/include/linux/smp.h @@ -32,19 +32,19 @@ extern void FASTCALL(smp_send_reschedule(int cpu)); /* - * Boot processor call to load the other CPU's + * Prepare machine for booting other CPUs. */ -extern void smp_boot_cpus(void); +extern void smp_prepare_cpus(unsigned int max_cpus); /* - * Processor call in. Must hold processors until .. + * Bring a CPU up */ -extern void smp_callin(void); +extern int __cpu_up(unsigned int cpunum); /* - * Multiprocessors may now schedule + * Final polishing of CPUs */ -extern void smp_commence(void); +extern void smp_cpus_done(unsigned int max_cpus); /* * Call a function on all other processors @@ -71,6 +71,13 @@ extern volatile int smp_msg_id; #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ +struct notifier_block; + +/* Need to know about CPUs going up/down? */ +extern int register_cpu_notifier(struct notifier_block *nb); +extern void unregister_cpu_notifier(struct notifier_block *nb); + +int cpu_up(unsigned int cpu); #else /* !SMP */ /* @@ -93,6 +100,10 @@ static inline void smp_send_reschedule_all(void) { } #define per_cpu(var, cpu) var #define this_cpu(var) var +/* Need to know about CPUs going up/down? */ +#define register_cpu_notifier(nb) 0 +#define unregister_cpu_notifier(nb) do { } while(0) + #endif /* !SMP */ #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) |