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sparc64: Store per-cpu offset in trap_block[]

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Surprisingly this actually makes LOAD_PER_CPU_BASE() a little
more efficient.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2009-04-01 01:47:10 -07:00
parent 19f0fa3fb3
commit 5a5488d3bb
5 changed files with 21 additions and 44 deletions
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18
arch/sparc/kernel/smp_64.c
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@@ -1371,23 +1371,17 @@ void smp_send_stop(void)
{
}
unsigned long __per_cpu_base __read_mostly;
unsigned long __per_cpu_shift __read_mostly;
EXPORT_SYMBOL(__per_cpu_base);
EXPORT_SYMBOL(__per_cpu_shift);
void __init real_setup_per_cpu_areas(void)
{
unsigned long paddr, goal, size, i;
unsigned long base, shift, paddr, goal, size, i;
char *ptr;
/* Copy section for each CPU (we discard the original) */
goal = PERCPU_ENOUGH_ROOM;
__per_cpu_shift = PAGE_SHIFT;
shift = PAGE_SHIFT;
for (size = PAGE_SIZE; size < goal; size <<= 1UL)
__per_cpu_shift++;
shift++;
paddr = lmb_alloc(size * NR_CPUS, PAGE_SIZE);
if (!paddr) {
@@ -1396,10 +1390,12 @@ void __init real_setup_per_cpu_areas(void)
}
ptr = __va(paddr);
__per_cpu_base = ptr - __per_cpu_start;
base = ptr - __per_cpu_start;
for (i = 0; i < NR_CPUS; i++, ptr += size)
for (i = 0; i < NR_CPUS; i++, ptr += size) {
__per_cpu_offset(i) = base + (i * size);
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
}
/* Setup %g5 for the boot cpu. */
__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());