0e5c9f39f6
I don't think we need to call hugetlb_clean_stale_pgtable() anymore
in 2.6.13 because of the rework with free_pgtables(). It now collect
all the pte page at the time of munmap. It used to only collect page
table pages when entire one pgd can be freed and left with staled pte
pages. Not anymore with 2.6.13. This function will never be called
and We should turn it into a BUG_ON.
I also spotted two problems here, not Adam's fault :-)
(1) in huge_pte_alloc(), it looks like a bug to me that pud is not
checked before calling pmd_alloc()
(2) in hugetlb_clean_stale_pgtable(), it also missed a call to
pmd_free_tlb. I think a tlb flush is required to flush the mapping
for the page table itself when we clear out the pmd pointing to a
pte page. However, since hugetlb_clean_stale_pgtable() is never
called, so it won't trigger the bug.
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
#ifndef _X86_64_PAGE_H
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#define _X86_64_PAGE_H
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#include <linux/config.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#ifdef __ASSEMBLY__
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#define PAGE_SIZE (0x1 << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & (__PHYSICAL_MASK << PAGE_SHIFT))
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#define THREAD_ORDER 1
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#ifdef __ASSEMBLY__
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#define THREAD_SIZE (1 << (PAGE_SHIFT + THREAD_ORDER))
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#else
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#define THREAD_SIZE (1UL << (PAGE_SHIFT + THREAD_ORDER))
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#endif
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#define CURRENT_MASK (~(THREAD_SIZE-1))
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#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
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#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
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#define HPAGE_SHIFT PMD_SHIFT
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#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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void clear_page(void *);
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void copy_page(void *, void *);
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pud; } pud_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define PTE_MASK PHYSICAL_PAGE_MASK
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).pmd)
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#define pud_val(x) ((x).pud)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pud(x) ((pud_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
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#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
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#define __START_KERNEL_map 0xffffffff80000000UL
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#define __PAGE_OFFSET 0xffff810000000000UL
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#else
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#define __PHYSICAL_START CONFIG_PHYSICAL_START
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#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
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#define __START_KERNEL_map 0xffffffff80000000
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#define __PAGE_OFFSET 0xffff810000000000
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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/* See Documentation/x86_64/mm.txt for a description of the memory map. */
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#define __PHYSICAL_MASK_SHIFT 46
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#define __PHYSICAL_MASK ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
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#define __VIRTUAL_MASK_SHIFT 48
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#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
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#define KERNEL_TEXT_SIZE (40UL*1024*1024)
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#define KERNEL_TEXT_START 0xffffffff80000000UL
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#ifndef __ASSEMBLY__
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#include <asm/bug.h>
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#endif /* __ASSEMBLY__ */
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#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
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/* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
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Otherwise you risk miscompilation. */
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#define __pa(x) (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
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/* __pa_symbol should be used for C visible symbols.
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This seems to be the official gcc blessed way to do such arithmetic. */
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#define __pa_symbol(x) \
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({unsigned long v; \
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asm("" : "=r" (v) : "0" (x)); \
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__pa(v); })
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define __boot_va(x) __va(x)
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#define __boot_pa(x) __pa(x)
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#ifdef CONFIG_FLATMEM
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#define pfn_to_page(pfn) (mem_map + (pfn))
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#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#endif
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS \
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(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
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VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#define __HAVE_ARCH_GATE_AREA 1
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#endif /* __KERNEL__ */
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#include <asm-generic/page.h>
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#endif /* _X86_64_PAGE_H */
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