lkml.org 
[lkml]   [2012]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 39/46] x86, mm: Unifying after_bootmem for 32bit and 64bit
Date
after_bootmem has different meaning in 32bit and 64bit.
32bit: after bootmem is ready
64bit: after bootmem is distroyed
Let's merget them make 32bit the same as 64bit.

for 32bit, it is mixing alloc_bootmem_pages, and alloc_low_page under
after_bootmem is set or not set.

alloc_bootmem is just wrapper for memblock for x86.

Now we have alloc_low_page() with memblock too. We can drop bootmem path
now, and only alloc_low_page only.

At the same time, we make alloc_low_page could handle real after_bootmem
for 32bit, because alloc_bootmem_pages could fallback to use slab too.

At last move after_bootmem set position for 32bit the same as 64bit.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/init.c | 2 --
arch/x86/mm/init_32.c | 21 ++++-----------------
2 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index a0f579a..028a129 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -35,7 +35,6 @@ __ref void *alloc_low_pages(unsigned int num)
unsigned long pfn;
int i;

-#ifdef CONFIG_X86_64
if (after_bootmem) {
unsigned int order;

@@ -43,7 +42,6 @@ __ref void *alloc_low_pages(unsigned int num)
return (void *)__get_free_pages(GFP_ATOMIC | __GFP_NOTRACK |
__GFP_ZERO, order);
}
-#endif

if ((pgt_buf_end + num) >= pgt_buf_top) {
unsigned long ret;
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 19ef9f0..f4fc4a2 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -73,10 +73,7 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)

#ifdef CONFIG_X86_PAE
if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
- if (after_bootmem)
- pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
- else
- pmd_table = (pmd_t *)alloc_low_page();
+ pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
@@ -98,17 +95,7 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
static pte_t * __init one_page_table_init(pmd_t *pmd)
{
if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
- pte_t *page_table = NULL;
-
- if (after_bootmem) {
-#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
- page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
-#endif
- if (!page_table)
- page_table =
- (pte_t *)alloc_bootmem_pages(PAGE_SIZE);
- } else
- page_table = (pte_t *)alloc_low_page();
+ pte_t *page_table = (pte_t *)alloc_low_page();

paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
@@ -708,8 +695,6 @@ void __init setup_bootmem_allocator(void)
printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT);
-
- after_bootmem = 1;
}

/*
@@ -795,6 +780,8 @@ void __init mem_init(void)
if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
reservedpages++;

+ after_bootmem = 1;
+
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
--
1.7.7


\
 
 \ /
  Last update: 2012-11-13 01:01    [W:0.379 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site