path: root/arch/sparc/kernel/smp_64.c
diff options
authorTejun Heo <>2009-08-14 15:00:51 +0900
committerTejun Heo <>2009-08-14 15:00:51 +0900
commitfb435d5233f8b6f9b93c11d6304d8e98fed03234 (patch)
tree76a210c3895b9db5dc7e1f185ee0a60744fef99a /arch/sparc/kernel/smp_64.c
parentfd1e8a1fe2b54df6c185b4fa65f181f50b9c4d4e (diff)
percpu: add pcpu_unit_offsets[]
Currently units are mapped sequentially into address space. This patch adds pcpu_unit_offsets[] which allows units to be mapped to arbitrary offsets from the chunk base address. This is necessary to allow sparse embedding which might would need to allocate address ranges and memory areas which aren't aligned to unit size but allocation atom size (page or large page size). This also simplifies things a bit by removing the need to calculate offset from unit number. With this change, there's no need for the arch code to know pcpu_unit_size. Update pcpu_setup_first_chunk() and first chunk allocators to return regular 0 or -errno return code instead of unit size or -errno. Signed-off-by: Tejun Heo <> Cc: David S. Miller <>
Diffstat (limited to 'arch/sparc/kernel/smp_64.c')
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index a42a4a744d14..b03fd362c629 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1478,9 +1478,10 @@ void __init setup_per_cpu_areas(void)
static struct vm_struct vm;
struct pcpu_alloc_info *ai;
unsigned long delta, cpu;
- size_t size_sum, pcpu_unit_size;
+ size_t size_sum;
size_t ptrs_size;
void **ptrs;
+ int rc;
ai = pcpu_alloc_alloc_info(1, nr_cpu_ids);
@@ -1526,14 +1527,15 @@ void __init setup_per_cpu_areas(void)
pcpu_map_range(start, end, virt_to_page(ptrs[cpu]));
- pcpu_unit_size = pcpu_setup_first_chunk(ai, vm.addr);
+ rc = pcpu_setup_first_chunk(ai, vm.addr);
+ if (rc)
+ panic("failed to setup percpu first chunk (%d)", rc);
free_bootmem(__pa(ptrs), ptrs_size);
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
- for_each_possible_cpu(cpu) {
- __per_cpu_offset(cpu) = delta + cpu * pcpu_unit_size;
- }
+ for_each_possible_cpu(cpu)
+ __per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
/* Setup %g5 for the boot cpu. */
__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());