Messages in this thread Patch in this message | | | Date | Mon, 27 Dec 2010 16:48:24 -0800 | From | Yinghai Lu <> | Subject | [PATCH 4/6] x86: Use early pre-allocated page table buffer top-down |
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We pre-allocate those buffer from top, so should use it top-down, so could return unused part will be bottom side. Will get less one hole in not used RAM.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
--- arch/x86/include/asm/init.h | 6 +++--- arch/x86/mm/init.c | 12 ++++++------ arch/x86/mm/init_32.c | 4 ++-- arch/x86/mm/init_64.c | 5 +++-- 4 files changed, 14 insertions(+), 13 deletions(-)
Index: linux-2.6/arch/x86/include/asm/init.h =================================================================== --- linux-2.6.orig/arch/x86/include/asm/init.h +++ linux-2.6/arch/x86/include/asm/init.h @@ -11,8 +11,8 @@ kernel_physical_mapping_init(unsigned lo unsigned long page_size_mask); -extern unsigned long __initdata e820_table_start; -extern unsigned long __meminitdata e820_table_end; -extern unsigned long __meminitdata e820_table_top; +extern unsigned long __meminitdata e820_table_start; +extern unsigned long __initdata e820_table_end; +extern unsigned long __meminitdata e820_table_bottom; #endif /* _ASM_X86_INIT_32_H */ Index: linux-2.6/arch/x86/mm/init.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init.c +++ linux-2.6/arch/x86/mm/init.c @@ -18,9 +18,9 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); -unsigned long __initdata e820_table_start; -unsigned long __meminitdata e820_table_end; -unsigned long __meminitdata e820_table_top; +unsigned long __meminitdata e820_table_start; +unsigned long __initdata e820_table_end; +unsigned long __meminitdata e820_table_bottom; int after_bootmem; @@ -73,12 +73,12 @@ static void __init find_early_table_spac if (base == MEMBLOCK_ERROR) panic("Cannot find space for the kernel page tables"); - e820_table_start = base >> PAGE_SHIFT; + e820_table_start = (base + tables) >> PAGE_SHIFT; e820_table_end = e820_table_start; - e820_table_top = e820_table_start + (tables >> PAGE_SHIFT); + e820_table_bottom = base >> PAGE_SHIFT; printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", - end, e820_table_start << PAGE_SHIFT, e820_table_top << PAGE_SHIFT); + end, e820_table_bottom << PAGE_SHIFT, e820_table_end << PAGE_SHIFT); } struct map_range { Index: linux-2.6/arch/x86/mm/init_32.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init_32.c +++ linux-2.6/arch/x86/mm/init_32.c @@ -61,10 +61,10 @@ bool __read_mostly __vmalloc_start_set = static __init void *alloc_low_page(void) { - unsigned long pfn = e820_table_end++; + unsigned long pfn = --e820_table_start; void *adr; - if (pfn >= e820_table_top) + if (pfn < e820_table_bottom) panic("alloc_low_page: ran out of memory"); adr = __va(pfn * PAGE_SIZE); Index: linux-2.6/arch/x86/mm/init_64.c =================================================================== --- linux-2.6.orig/arch/x86/mm/init_64.c +++ linux-2.6/arch/x86/mm/init_64.c @@ -314,7 +314,7 @@ void __init cleanup_highmap(void) static __ref void *alloc_low_page(unsigned long *phys) { - unsigned long pfn = e820_table_end++; + unsigned long pfn; void *adr; if (after_bootmem) { @@ -324,7 +324,8 @@ static __ref void *alloc_low_page(unsign return adr; } - if (pfn >= e820_table_top) + pfn = --e820_table_start; + if (pfn < e820_table_bottom) panic("alloc_low_page: ran out of memory"); adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
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