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    Subject[PATCH] [15/50] x86_64: Return EINVAL for unknown address in change_page_attr
    Date

    Matches what i386 does and makes more sense.

    Signed-off-by: Andi Kleen <ak@suse.de>

    ---
    arch/x86_64/mm/pageattr.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    Index: linux/arch/x86_64/mm/pageattr.c
    ===================================================================
    --- linux.orig/arch/x86_64/mm/pageattr.c
    +++ linux/arch/x86_64/mm/pageattr.c
    @@ -151,7 +151,9 @@ __change_page_attr(unsigned long address
    pgprot_t ref_prot2;

    kpte = lookup_address(address);
    - if (!kpte) return 0;
    + if (!kpte)
    + return -EINVAL;
    +
    kpte_page = virt_to_page(((unsigned long)kpte) & PAGE_MASK);
    BUG_ON(PageCompound(kpte_page));
    BUG_ON(PageLRU(kpte_page));
    -
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