diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2012-11-17 07:39:01 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 23:59:23 +0400 |
| commit | 5c51bdbe4c74dce7996d0bbfa39974775cc3f13c (patch) | |
| tree | 42c95d78f80b73307c4df17c80c03b2e701e7372 /arch/x86/mm/init.c | |
| parent | 868bf4d6b94c980d3ad87f892a5e528b8ee2c320 (diff) | |
| download | linux-5c51bdbe4c74dce7996d0bbfa39974775cc3f13c.tar.xz | |
x86, mm: Merge alloc_low_page between 64bit and 32bit
They are almost same except 64 bit need to handle after_bootmem case.
Add mm_internal.h to make that alloc_low_page() only to be accessible
from arch/x86/mm/init*.c
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-25-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm/init.c')
| -rw-r--r-- | arch/x86/mm/init.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 2393d0099e7f..848189229b2d 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -17,10 +17,44 @@ #include <asm/proto.h> #include <asm/dma.h> /* for MAX_DMA_PFN */ +#include "mm_internal.h" + unsigned long __initdata pgt_buf_start; unsigned long __meminitdata pgt_buf_end; unsigned long __meminitdata pgt_buf_top; +__ref void *alloc_low_page(void) +{ + unsigned long pfn; + void *adr; + +#ifdef CONFIG_X86_64 + if (after_bootmem) { + adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); + + return adr; + } +#endif + + if ((pgt_buf_end + 1) >= pgt_buf_top) { + unsigned long ret; + if (min_pfn_mapped >= max_pfn_mapped) + panic("alloc_low_page: ran out of memory"); + ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT, + max_pfn_mapped << PAGE_SHIFT, + PAGE_SIZE, PAGE_SIZE); + if (!ret) + panic("alloc_low_page: can not alloc memory"); + memblock_reserve(ret, PAGE_SIZE); + pfn = ret >> PAGE_SHIFT; + } else + pfn = pgt_buf_end++; + + adr = __va(pfn * PAGE_SIZE); + clear_page(adr); + return adr; +} + /* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */ #define INIT_PGT_BUF_SIZE (5 * PAGE_SIZE) RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE); |