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> |
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| proc-mn103e010 | ||
| unit-asb2303 | ||
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| bug.h | ||
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| ide.h | ||
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| Kbuild | ||
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| kmap_types.h | ||
| kprobes.h | ||
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| local.h | ||
| mc146818rtc.h | ||
| mman.h | ||
| mmu.h | ||
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| module.h | ||
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| mutex.h | ||
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| nmi.h | ||
| page.h | ||
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| param.h | ||
| pci.h | ||
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| pgalloc.h | ||
| pgtable.h | ||
| pio-regs.h | ||
| poll.h | ||
| posix_types.h | ||
| processor.h | ||
| ptrace.h | ||
| reset-regs.h | ||
| resource.h | ||
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| serial.h | ||
| setup.h | ||
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| shmparam.h | ||
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| unaligned.h | ||
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| xor.h | ||