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Date: Wed, 17 Jun 2009 12:52:15 +0900
From: Tejun Heo <tj@...nel.org>
To: linux-kernel@...r.kernel.org, x86@...nel.org,
linux-arch@...r.kernel.org, mingo@...e.hu, JBeulich@...ell.com,
andi@...stfloor.org, hpa@...or.com, tglx@...utronix.de
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/7] x86: prepare setup_pcpu_lpage() for pageattr fix
Make the following changes in preparation of coming pageattr updates.
* Define and use array of struct pcpul_ent instead of array of
pointers. The only difference is ->cpu field which is set but
unused yet.
* Rename variables according to the above change.
* Rename local variable vm to pcpul_vm and move it out of the
function.
[ Impact: no functional difference ]
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jan Beulich <JBeulich@...ell.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
arch/x86/kernel/setup_percpu.c | 58 ++++++++++++++++++++++-----------------
1 files changed, 33 insertions(+), 25 deletions(-)
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 8794c0c..7d38941 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -137,8 +137,14 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
* better than only using 4k mappings while still being NUMA friendly.
*/
#ifdef CONFIG_NEED_MULTIPLE_NODES
+struct pcpul_ent {
+ unsigned int cpu;
+ void *ptr;
+};
+
static size_t pcpul_size __initdata;
-static void **pcpul_ptrs __initdata;
+static struct pcpul_ent *pcpul_map __initdata;
+static struct vm_struct pcpul_vm;
static struct page * __init pcpul_get_page(unsigned int cpu, int pageno)
{
@@ -147,13 +153,12 @@ static struct page * __init pcpul_get_page(unsigned int cpu, int pageno)
if (off >= pcpul_size)
return NULL;
- return virt_to_page(pcpul_ptrs[cpu] + off);
+ return virt_to_page(pcpul_map[cpu].ptr + off);
}
static ssize_t __init setup_pcpu_lpage(size_t static_size)
{
- static struct vm_struct vm;
- size_t ptrs_size, dyn_size;
+ size_t map_size, dyn_size;
unsigned int cpu;
ssize_t ret;
@@ -180,12 +185,14 @@ static ssize_t __init setup_pcpu_lpage(size_t static_size)
dyn_size = pcpul_size - static_size - PERCPU_FIRST_CHUNK_RESERVE;
/* allocate pointer array and alloc large pages */
- ptrs_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpul_ptrs[0]));
- pcpul_ptrs = alloc_bootmem(ptrs_size);
+ map_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpul_map[0]));
+ pcpul_map = alloc_bootmem(map_size);
for_each_possible_cpu(cpu) {
- pcpul_ptrs[cpu] = pcpu_alloc_bootmem(cpu, PMD_SIZE, PMD_SIZE);
- if (!pcpul_ptrs[cpu])
+ pcpul_map[cpu].cpu = cpu;
+ pcpul_map[cpu].ptr = pcpu_alloc_bootmem(cpu, PMD_SIZE,
+ PMD_SIZE);
+ if (!pcpul_map[cpu].ptr)
goto enomem;
/*
@@ -196,42 +203,43 @@ static ssize_t __init setup_pcpu_lpage(size_t static_size)
* not well-specified to have a PAT-incompatible area
* (unmapped RAM, device memory, etc.) in that hole.
*/
- free_bootmem(__pa(pcpul_ptrs[cpu] + pcpul_size),
+ free_bootmem(__pa(pcpul_map[cpu].ptr + pcpul_size),
PMD_SIZE - pcpul_size);
- memcpy(pcpul_ptrs[cpu], __per_cpu_load, static_size);
+ memcpy(pcpul_map[cpu].ptr, __per_cpu_load, static_size);
}
/* allocate address and map */
- vm.flags = VM_ALLOC;
- vm.size = num_possible_cpus() * PMD_SIZE;
- vm_area_register_early(&vm, PMD_SIZE);
+ pcpul_vm.flags = VM_ALLOC;
+ pcpul_vm.size = num_possible_cpus() * PMD_SIZE;
+ vm_area_register_early(&pcpul_vm, PMD_SIZE);
for_each_possible_cpu(cpu) {
- pmd_t *pmd;
+ pmd_t *pmd, pmd_v;
- pmd = populate_extra_pmd((unsigned long)vm.addr
- + cpu * PMD_SIZE);
- set_pmd(pmd, pfn_pmd(page_to_pfn(virt_to_page(pcpul_ptrs[cpu])),
- PAGE_KERNEL_LARGE));
+ pmd = populate_extra_pmd((unsigned long)pcpul_vm.addr +
+ cpu * PMD_SIZE);
+ pmd_v = pfn_pmd(page_to_pfn(virt_to_page(pcpul_map[cpu].ptr)),
+ PAGE_KERNEL_LARGE);
+ set_pmd(pmd, pmd_v);
}
/* we're ready, commit */
pr_info("PERCPU: Remapped at %p with large pages, static data "
- "%zu bytes\n", vm.addr, static_size);
+ "%zu bytes\n", pcpul_vm.addr, static_size);
ret = pcpu_setup_first_chunk(pcpul_get_page, static_size,
PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
- PMD_SIZE, vm.addr, NULL);
- goto out_free_ar;
+ PMD_SIZE, pcpul_vm.addr, NULL);
+ goto out_free_map;
enomem:
for_each_possible_cpu(cpu)
- if (pcpul_ptrs[cpu])
- free_bootmem(__pa(pcpul_ptrs[cpu]), pcpul_size);
+ if (pcpul_map[cpu].ptr)
+ free_bootmem(__pa(pcpul_map[cpu].ptr), pcpul_size);
ret = -ENOMEM;
-out_free_ar:
- free_bootmem(__pa(pcpul_ptrs), ptrs_size);
+out_free_map:
+ free_bootmem(__pa(pcpul_map), map_size);
return ret;
}
#else
--
1.6.0.2
--
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