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    SubjectRe: [PATCH 0 of 4] x86: some more patches

    * Jan Beulich <> wrote:

    > > Yes, but if you cast to long the result will be 32bit again. Or do
    > > you rely on it being always used in 64bit signed context with sign
    > > extension? While that might work it would seem rather fragile to me,
    > > just asking for similar future bugs.
    > Even if conversion is to 64-bit unsigned, the value (being signed)
    > will be sign-extended first (to preserve its value modulo 2**<target
    > type width>).

    yes. It would be nice if Andi could test my fix instead of arguing why
    he thinks it's unlikely to work ;-)

    (i've got the cleanup patch below as well ontop of today's x86.git which
    includes the first fix, but it's an RFC as it has wider impact and might
    break stuff.)


    Subject: x86: PAGE_MASK cleanup
    From: Ingo Molnar <>

    Signed-off-by: Ingo Molnar <>
    include/asm-x86/page.h | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    Index: linux-x86.q/include/asm-x86/page.h
    --- linux-x86.q.orig/include/asm-x86/page.h
    +++ linux-x86.q/include/asm-x86/page.h
    @@ -6,12 +6,12 @@
    /* PAGE_SHIFT determines the page size */
    #define PAGE_SHIFT 12
    #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
    -#define PAGE_MASK (~(PAGE_SIZE-1))
    +#define PAGE_MASK (_AT(phys_addr_t, ~(PAGE_SIZE-1)))

    #ifdef __KERNEL__

    -#define PTE_MASK (_AT(long, PHYSICAL_PAGE_MASK))

    #define LARGE_PAGE_SIZE (_AC(1,UL) << PMD_SHIFT)

     \ /
      Last update: 2008-01-16 16:49    [W:0.022 / U:10.256 seconds]
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