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authorTejun Heo <tj@kernel.org>2009-02-24 11:57:21 +0900
committerTejun Heo <tj@kernel.org>2009-02-24 11:57:21 +0900
commit8d408b4be37bc49c9086531f2ebe411cf5731746 (patch)
tree559a532a04b24dd164ec2c72ab545b30a5a604ef /arch/x86/kernel/setup_percpu.c
parentd9b55eeb1d55ef2dc5a4fdbff9604c2c68cb5649 (diff)
percpu: give more latitude to arch specific first chunk initialization
Impact: more latitude for first percpu chunk allocation The first percpu chunk serves the kernel static percpu area and may or may not contain extra room for further dynamic allocation. Initialization of the first chunk needs to be done before normal memory allocation service is up, so it has its own init path - pcpu_setup_static(). It seems archs need more latitude while initializing the first chunk for example to take advantage of large page mapping. This patch makes the following changes to allow this. * Define PERCPU_DYNAMIC_RESERVE to give arch hint about how much space to reserve in the first chunk for further dynamic allocation. * Rename pcpu_setup_static() to pcpu_setup_first_chunk(). * Make pcpu_setup_first_chunk() much more flexible by fetching page pointer by callback and adding optional @unit_size, @free_size and @base_addr arguments which allow archs to selectively part of chunk initialization to their likings. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/x86/kernel/setup_percpu.c')
-rw-r--r--arch/x86/kernel/setup_percpu.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 671e6528a82..d928e888720 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -41,6 +41,16 @@ unsigned long __per_cpu_offset[NR_CPUS] __read_mostly = {
};
EXPORT_SYMBOL(__per_cpu_offset);
+static struct page **pcpu4k_pages __initdata;
+static int pcpu4k_nr_static_pages __initdata;
+
+static struct page * __init pcpu4k_get_page(unsigned int cpu, int pageno)
+{
+ if (pageno < pcpu4k_nr_static_pages)
+ return pcpu4k_pages[cpu * pcpu4k_nr_static_pages + pageno];
+ return NULL;
+}
+
static void __init pcpu4k_populate_pte(unsigned long addr)
{
populate_extra_pte(addr);
@@ -109,7 +119,10 @@ void __init setup_per_cpu_areas(void)
}
}
- pcpu_unit_size = pcpu_setup_static(pcpu4k_populate_pte, pages, size);
+ pcpu4k_pages = pages;
+ pcpu4k_nr_static_pages = nr_cpu_pages;
+ pcpu_unit_size = pcpu_setup_first_chunk(pcpu4k_get_page, size, 0, 0,
+ NULL, pcpu4k_populate_pte);
free_bootmem(__pa(pages), pages_size);