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>
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* include/asm-v850/page.h -- VM ops
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*
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* Copyright (C) 2001,02,03,05 NEC Electronics Corporation
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* Copyright (C) 2001,02,03,05 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_PAGE_H__
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#define __V850_PAGE_H__
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#include <asm/machdep.h>
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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/*
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* PAGE_OFFSET -- the first address of the first page of memory. For archs with
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* no MMU this corresponds to the first free page in physical memory (aligned
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* on a page boundary).
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*/
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#ifndef PAGE_OFFSET
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#define PAGE_OFFSET 0x0000000
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#endif
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#ifndef __ASSEMBLY__
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#define STRICT_MM_TYPECHECKS
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#define clear_page(page) memset ((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to, from) memcpy ((void *)(to), (void *)from, PAGE_SIZE)
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#define clear_user_page(addr, vaddr, page) \
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do { clear_page(addr); \
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flush_dcache_page(page); \
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} while (0)
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#define copy_user_page(to, from, vaddr, page) \
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do { copy_page(to, from); \
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flush_dcache_page(page); \
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} while (0)
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#ifdef STRICT_MM_TYPECHECKS
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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 pgd; } 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).pmd)
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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 __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#else /* !STRICT_MM_TYPECHECKS */
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/*
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* .. while these make it easier on the compiler
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*/
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typedef unsigned long pte_t;
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typedef unsigned long pmd_t;
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typedef unsigned long pgd_t;
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typedef unsigned long pgprot_t;
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#define pte_val(x) (x)
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#define pmd_val(x) (x)
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#define pgd_val(x) (x)
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#define pgprot_val(x) (x)
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#define __pte(x) (x)
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#define __pmd(x) (x)
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#define __pgd(x) (x)
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#define __pgprot(x) (x)
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#endif /* STRICT_MM_TYPECHECKS */
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#endif /* !__ASSEMBLY__ */
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/* No current v850 processor has virtual memory. */
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#define __virt_to_phys(addr) (addr)
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#define __phys_to_virt(addr) (addr)
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#define virt_to_pfn(kaddr) (__virt_to_phys (kaddr) >> PAGE_SHIFT)
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#define pfn_to_virt(pfn) __phys_to_virt ((pfn) << PAGE_SHIFT)
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#define MAP_NR(kaddr) \
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(((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT)
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#define virt_to_page(kaddr) (mem_map + MAP_NR (kaddr))
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#define page_to_virt(page) \
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((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
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#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#define virt_addr_valid(kaddr) \
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(((void *)(kaddr) >= (void *)PAGE_OFFSET) && MAP_NR (kaddr) < max_mapnr)
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#define __pa(x) __virt_to_phys ((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt ((unsigned long)(x)))
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#endif /* __V850_PAGE_H__ */
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