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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-18 19:41:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-08-18 19:41:05 -0700
commit77f312a96dd1e01c49ccd872265e70a8346b53cc (patch)
tree7e6d1114dfaf0eb4732c97ad18819f23e4ebef09 /mm
parentdc8ed71eeb8adce08d3070f4130e12ee540baa59 (diff)
parent142d44b0dd6741a64a7bdbe029110e7c1dcf1d23 (diff)
downloadop-kernel-dev-77f312a96dd1e01c49ccd872265e70a8346b53cc.zip
op-kernel-dev-77f312a96dd1e01c49ccd872265e70a8346b53cc.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu: use the right flag for get_vm_area() percpu, sparc64: fix sparse possible cpu map handling init: set nr_cpu_ids before setup_per_cpu_areas()
Diffstat (limited to 'mm')
-rw-r--r--mm/percpu.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/mm/percpu.c b/mm/percpu.c
index b70f2ac..5fe3784 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -8,12 +8,12 @@
*
* This is percpu allocator which can handle both static and dynamic
* areas. Percpu areas are allocated in chunks in vmalloc area. Each
- * chunk is consisted of num_possible_cpus() units and the first chunk
- * is used for static percpu variables in the kernel image (special
- * boot time alloc/init handling necessary as these areas need to be
- * brought up before allocation services are running). Unit grows as
- * necessary and all units grow or shrink in unison. When a chunk is
- * filled up, another chunk is allocated. ie. in vmalloc area
+ * chunk is consisted of nr_cpu_ids units and the first chunk is used
+ * for static percpu variables in the kernel image (special boot time
+ * alloc/init handling necessary as these areas need to be brought up
+ * before allocation services are running). Unit grows as necessary
+ * and all units grow or shrink in unison. When a chunk is filled up,
+ * another chunk is allocated. ie. in vmalloc area
*
* c0 c1 c2
* ------------------- ------------------- ------------
@@ -558,7 +558,7 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme)
static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
bool flush_tlb)
{
- unsigned int last = num_possible_cpus() - 1;
+ unsigned int last = nr_cpu_ids - 1;
unsigned int cpu;
/* unmap must not be done on immutable chunk */
@@ -643,7 +643,7 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size,
*/
static int pcpu_map(struct pcpu_chunk *chunk, int page_start, int page_end)
{
- unsigned int last = num_possible_cpus() - 1;
+ unsigned int last = nr_cpu_ids - 1;
unsigned int cpu;
int err;
@@ -749,7 +749,7 @@ static struct pcpu_chunk *alloc_pcpu_chunk(void)
chunk->map[chunk->map_used++] = pcpu_unit_size;
chunk->page = chunk->page_ar;
- chunk->vm = get_vm_area(pcpu_chunk_size, GFP_KERNEL);
+ chunk->vm = get_vm_area(pcpu_chunk_size, VM_ALLOC);
if (!chunk->vm) {
free_pcpu_chunk(chunk);
return NULL;
@@ -1067,9 +1067,9 @@ size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
PFN_UP(size_sum));
pcpu_unit_size = pcpu_unit_pages << PAGE_SHIFT;
- pcpu_chunk_size = num_possible_cpus() * pcpu_unit_size;
+ pcpu_chunk_size = nr_cpu_ids * pcpu_unit_size;
pcpu_chunk_struct_size = sizeof(struct pcpu_chunk)
- + num_possible_cpus() * pcpu_unit_pages * sizeof(struct page *);
+ + nr_cpu_ids * pcpu_unit_pages * sizeof(struct page *);
if (dyn_size < 0)
dyn_size = pcpu_unit_size - static_size - reserved_size;
@@ -1248,7 +1248,7 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
} else
pcpue_unit_size = max_t(size_t, pcpue_size, PCPU_MIN_UNIT_SIZE);
- chunk_size = pcpue_unit_size * num_possible_cpus();
+ chunk_size = pcpue_unit_size * nr_cpu_ids;
pcpue_ptr = __alloc_bootmem_nopanic(chunk_size, PAGE_SIZE,
__pa(MAX_DMA_ADDRESS));
@@ -1259,12 +1259,15 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
}
/* return the leftover and copy */
- for_each_possible_cpu(cpu) {
+ for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
void *ptr = pcpue_ptr + cpu * pcpue_unit_size;
- free_bootmem(__pa(ptr + pcpue_size),
- pcpue_unit_size - pcpue_size);
- memcpy(ptr, __per_cpu_load, static_size);
+ if (cpu_possible(cpu)) {
+ free_bootmem(__pa(ptr + pcpue_size),
+ pcpue_unit_size - pcpue_size);
+ memcpy(ptr, __per_cpu_load, static_size);
+ } else
+ free_bootmem(__pa(ptr), pcpue_unit_size);
}
/* we're ready, commit */
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