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x86, mm: Move init_memory_mapping calling out of setup.c 

Now init_memory_mapping is called two times, later will be called for every
ram ranges.

Could put all related init_mem calling together and out of setup.c.

Actually, it reverts commit 1bbbbe7
    x86: Exclude E820_RESERVED regions and memory holes above 4 GB from direct mapping.
will address that later with complete solution include handling hole under 4g.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-5-git-send-email-yinghai@kernel.org
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2012-11-16 19:38:41 -08:00 committed by H. Peter Anvin
parent 2086fe1159
commit 22ddfcaa0d
4 changed files with 20 additions and 29 deletions
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1
arch/x86/include/asm/init.h
View File

@ -12,7 +12,6 @@ kernel_physical_mapping_init(unsigned long start,
unsigned long end,
unsigned long page_size_mask);
extern unsigned long __initdata pgt_buf_start;
extern unsigned long __meminitdata pgt_buf_end;
extern unsigned long __meminitdata pgt_buf_top;

2
arch/x86/include/asm/pgtable.h
View File

@ -602,7 +602,7 @@ static inline int pgd_none(pgd_t pgd)
#ifndef __ASSEMBLY__
extern int direct_gbpages;
void probe_page_size_mask(void);
void init_mem_mapping(void);
/* local pte updates need not use xchg for locking */
static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)

27
arch/x86/kernel/setup.c
View File

@ -913,34 +913,9 @@ void __init setup_arch(char **cmdline_p)
setup_real_mode();
init_gbpages();
probe_page_size_mask();
/* max_pfn_mapped is updated here */
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
init_mem_mapping();
#ifdef CONFIG_X86_64
if (max_pfn > max_low_pfn) {
int i;
unsigned long start, end;
unsigned long start_pfn, end_pfn;
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn,
NULL) {
end = PFN_PHYS(end_pfn);
if (end <= (1UL<<32))
continue;
start = PFN_PHYS(start_pfn);
max_pfn_mapped = init_memory_mapping(
max((1UL<<32), start), end);
}
/* can we preseve max_low_pfn ?*/
max_low_pfn = max_pfn;
}
#endif
memblock.current_limit = get_max_mapped();
dma_contiguous_reserve(0);

19
arch/x86/mm/init.c
View File

@ -37,7 +37,7 @@ struct map_range {
static int page_size_mask;
void probe_page_size_mask(void)
static void __init probe_page_size_mask(void)
{
#if !defined(CONFIG_DEBUG_PAGEALLOC) && !defined(CONFIG_KMEMCHECK)
/*
@ -315,6 +315,23 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
return ret >> PAGE_SHIFT;
}
void __init init_mem_mapping(void)
{
probe_page_size_mask();
/* max_pfn_mapped is updated here */
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
#ifdef CONFIG_X86_64
if (max_pfn > max_low_pfn) {
max_pfn_mapped = init_memory_mapping(1UL<<32,
max_pfn<<PAGE_SHIFT);
/* can we preseve max_low_pfn ?*/
max_low_pfn = max_pfn;
}
#endif
}
/*
* devmem_is_allowed() checks to see if /dev/mem access to a certain address