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sparc64: Only allocate per-cpu areas for possible cpus. 

This gets us real close to the generic implementation of
setup_per_cpu_areas() except:

1) We store the per-cpu offset into the trap_block[], whereas
   the generic code has it's own static array.

2) We have to initialize the %g5 register to hold the boot cpu's
   per-cpu area offset.

3) The OBP/MDESC cpu info scan is performed at the end.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-04-01 16:22:27 -07:00
parent 73fffc037e
commit 0c243ad81f
1 changed files with 6 additions and 16 deletions
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22
arch/sparc/kernel/smp_64.c
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@ -1373,27 +1373,17 @@ void smp_send_stop(void)
void __init setup_per_cpu_areas(void)
{
unsigned long base, shift, goal, size, i;
unsigned long size, i, nr_possible_cpus = num_possible_cpus();
char *ptr;
/* Copy section for each CPU (we discard the original) */
goal = PERCPU_ENOUGH_ROOM;
size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
ptr = alloc_bootmem_pages(size * nr_possible_cpus);
shift = PAGE_SHIFT;
for (size = PAGE_SIZE; size < goal; size <<= 1UL)
shift++;
ptr = __alloc_bootmem(size * NR_CPUS, PAGE_SIZE, 0);
if (!ptr) {
prom_printf("Cannot allocate per-cpu memory.\n");
prom_halt();
}
base = ptr - __per_cpu_start;
for (i = 0; i < NR_CPUS; i++, ptr += size) {
__per_cpu_offset(i) = base + (i * size);
for_each_possible_cpu(i) {
__per_cpu_offset(i) = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
ptr += size;
}
/* Setup %g5 for the boot cpu. */