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mm: don't use alloc_bootmem_low() where not strictly needed

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Since alloc_bootmem() will never return inaccessible (via virtual
addressing) memory anyway, using the ..._low() variant only makes sense
when the physical address range of the allocated memory must fulfill
further constraints, espacially since on 64-bits (or more generally in all
cases where the pools the two variants allocate from are than the full
available range.

Probably the use in alloc_tce_table() could also be eliminated (based on
code inspection of pci-calgary_64.c), but that seems too risky given I
know nothing about that hardware and have no way to test it.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Beulich 2009-09-21 17:03:06 -07:00 committed by Linus Torvalds
parent 4481374ce8
commit 3c1596efe1
4 changed files with 5 additions and 5 deletions
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2
arch/x86/kernel/e820.c
View File

@ -1331,7 +1331,7 @@ void __init e820_reserve_resources(void)
struct resource *res;
u64 end;
res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
res = alloc_bootmem(sizeof(struct resource) * e820.nr_map);
e820_res = res;
for (i = 0; i < e820.nr_map; i++) {
end = e820.map[i].addr + e820.map[i].size - 1;

4
arch/x86/mm/init_32.c
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@ -84,7 +84,7 @@ 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_low_pages(PAGE_SIZE);
pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
else
pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
@ -116,7 +116,7 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
#endif
if (!page_table)
page_table =
(pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
(pte_t *)alloc_bootmem_pages(PAGE_SIZE);
} else
page_table = (pte_t *)alloc_low_page();

2
drivers/firmware/memmap.c
View File

@ -164,7 +164,7 @@ int __init firmware_map_add_early(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
entry = alloc_bootmem_low(sizeof(struct firmware_map_entry));
entry = alloc_bootmem(sizeof(struct firmware_map_entry));
if (WARN_ON(!entry))
return -ENOMEM;

2
kernel/power/snapshot.c
View File

@ -619,7 +619,7 @@ __register_nosave_region(unsigned long start_pfn, unsigned long end_pfn,
BUG_ON(!region);
} else
/* This allocation cannot fail */
region = alloc_bootmem_low(sizeof(struct nosave_region));
region = alloc_bootmem(sizeof(struct nosave_region));
region->start_pfn = start_pfn;
region->end_pfn = end_pfn;
list_add_tail(&region->list, &nosave_regions);