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>
181 lines
5.4 KiB
C
181 lines
5.4 KiB
C
#ifndef __ASM_SH_PAGE_H
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#define __ASM_SH_PAGE_H
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/*
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* Copyright (C) 1999 Niibe Yutaka
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*/
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#include <linux/const.h>
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/* PAGE_SHIFT determines the page size */
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#if defined(CONFIG_PAGE_SIZE_4KB)
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# define PAGE_SHIFT 12
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#elif defined(CONFIG_PAGE_SIZE_8KB)
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# define PAGE_SHIFT 13
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#elif defined(CONFIG_PAGE_SIZE_64KB)
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# define PAGE_SHIFT 16
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#else
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# error "Bogus kernel page size?"
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#endif
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PTE_MASK PAGE_MASK
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define HPAGE_SHIFT 16
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
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#define HPAGE_SHIFT 18
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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#define HPAGE_SHIFT 20
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
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#define HPAGE_SHIFT 22
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
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#define HPAGE_SHIFT 26
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
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#define HPAGE_SHIFT 29
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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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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#endif
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#ifndef __ASSEMBLY__
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extern unsigned long shm_align_mask;
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extern unsigned long max_low_pfn, min_low_pfn;
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extern unsigned long memory_start, memory_end;
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extern void clear_page(void *to);
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extern void copy_page(void *to, void *from);
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#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
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(defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
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defined(CONFIG_SH7705_CACHE_32KB))
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struct page;
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struct vm_area_struct;
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extern void clear_user_page(void *to, unsigned long address, struct page *page);
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extern void copy_user_page(void *to, void *from, unsigned long address,
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struct page *page);
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#if defined(CONFIG_CPU_SH4)
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extern void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma);
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE
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#endif
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#else
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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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#endif
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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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#ifdef CONFIG_X2TLB
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typedef struct { unsigned long pte_low, pte_high; } pte_t;
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typedef struct { unsigned long long pgprot; } pgprot_t;
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typedef struct { unsigned long long pgd; } pgd_t;
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#define pte_val(x) \
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((x).pte_low | ((unsigned long long)(x).pte_high << 32))
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#define __pte(x) \
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({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
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#elif defined(CONFIG_SUPERH32)
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typedef struct { unsigned long pte_low; } pte_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pte_val(x) ((x).pte_low)
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#define __pte(x) ((pte_t) { (x) } )
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#else
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typedef struct { unsigned long long pte_low; } pte_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pte_val(x) ((x).pte_low)
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#define __pte(x) ((pte_t) { (x) } )
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#endif
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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 __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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typedef struct page *pgtable_t;
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#endif /* !__ASSEMBLY__ */
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/*
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* __MEMORY_START and SIZE are the physical addresses and size of RAM.
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*/
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#define __MEMORY_START CONFIG_MEMORY_START
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#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
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/*
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* PAGE_OFFSET is the virtual address of the start of kernel address
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* space.
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*/
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#define PAGE_OFFSET CONFIG_PAGE_OFFSET
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/*
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* Virtual to physical RAM address translation.
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*
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* In 29 bit mode, the physical offset of RAM from address 0 is visible in
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* the kernel virtual address space, and thus we don't have to take
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* this into account when translating. However in 32 bit mode this offset
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* is not visible (it is part of the PMB mapping) and so needs to be
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* added or subtracted as required.
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*/
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#ifdef CONFIG_32BIT
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
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#else
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#endif
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/*
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* PFN = physical frame number (ie PFN 0 == physical address 0)
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* PFN_START is the PFN of the first page of RAM. By defining this we
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* don't have struct page entries for the portion of address space
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* between physical address 0 and the start of RAM.
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*/
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#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
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#define ARCH_PFN_OFFSET (PFN_START)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#ifdef CONFIG_FLATMEM
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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_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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/* vDSO support */
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#ifdef CONFIG_VSYSCALL
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#define __HAVE_ARCH_GATE_AREA
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#endif
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/*
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* Some drivers need to perform DMA into kmalloc'ed buffers
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* and so we have to increase the kmalloc minalign for this.
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*/
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#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
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#ifdef CONFIG_SUPERH64
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/*
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* While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
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* happily generate {ld/st}.q pairs, requiring us to have 8-byte
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* alignment to avoid traps. The kmalloc alignment is gauranteed by
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* virtue of L1_CACHE_BYTES, requiring this to only be special cased
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* for slab caches.
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*/
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#define ARCH_SLAB_MINALIGN 8
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#endif
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#endif /* __ASM_SH_PAGE_H */
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