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27ac792ca0
On 32-bit architectures PAGE_ALIGN() truncates 64-bit values to the 32-bit boundary. For example: u64 val = PAGE_ALIGN(size); always returns a value < 4GB even if size is greater than 4GB. The problem resides in PAGE_MASK definition (from include/asm-x86/page.h for example): #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) ... #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) The "~" is performed on a 32-bit value, so everything in "and" with PAGE_MASK greater than 4GB will be truncated to the 32-bit boundary. Using the ALIGN() macro seems to be the right way, because it uses typeof(addr) for the mask. Also move the PAGE_ALIGN() definitions out of include/asm-*/page.h in include/linux/mm.h. See also lkml discussion: http://lkml.org/lkml/2008/6/11/237 [akpm@linux-foundation.org: fix drivers/media/video/uvc/uvc_queue.c] [akpm@linux-foundation.org: fix v850] [akpm@linux-foundation.org: fix powerpc] [akpm@linux-foundation.org: fix arm] [akpm@linux-foundation.org: fix mips] [akpm@linux-foundation.org: fix drivers/media/video/pvrusb2/pvrusb2-dvb.c] [akpm@linux-foundation.org: fix drivers/mtd/maps/uclinux.c] [akpm@linux-foundation.org: fix powerpc] Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
#ifndef _ASM_PAGE_H
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#define _ASM_PAGE_H
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#include <asm/virtconvert.h>
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#include <asm/mem-layout.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
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#define free_user_page(page, addr) free_page(addr)
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#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
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#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
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#define copy_user_page(vto, vfrom, vaddr, topg) memcpy((vto), (vfrom), PAGE_SIZE)
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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 ste[64];} pmd_t;
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typedef struct { pmd_t pue[1]; } pud_t;
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typedef struct { pud_t pge[1]; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct page *pgtable_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).ste[0])
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#define pud_val(x) ((x).pue[0])
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#define pgd_val(x) ((x).pge[0])
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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 PTE_MASK PAGE_MASK
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#define devmem_is_allowed(pfn) 1
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#define __pa(vaddr) virt_to_phys((void *) (unsigned long) (vaddr))
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#define __va(paddr) phys_to_virt((unsigned long) (paddr))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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extern unsigned long max_low_pfn;
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extern unsigned long min_low_pfn;
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extern unsigned long max_pfn;
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#ifdef CONFIG_MMU
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#else
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#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
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#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
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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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#ifdef CONFIG_MMU
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#define VM_DATA_DEFAULT_FLAGS \
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(VM_READ | VM_WRITE | \
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((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#endif
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#endif /* __ASSEMBLY__ */
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#endif /* _ASM_PAGE_H */
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