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    Subject[PATCH v9 28/46] x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages
    Date
    From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

    Add link for more information
    279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve

    -v2: updated to commets from hpa to include commit name.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    ---
    arch/x86/mm/init.c | 9 +++++++++
    1 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
    index daff14c..a8e6d07 100644
    --- a/arch/x86/mm/init.c
    +++ b/arch/x86/mm/init.c
    @@ -25,6 +25,15 @@ unsigned long __meminitdata pgt_buf_top;

    static unsigned long min_pfn_mapped;

    +/*
    + * Pages returned are already directly mapped.
    + *
    + * Changing that is likely to break Xen, see commit:
    + *
    + * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve
    + *
    + * for detailed information.
    + */
    __ref void *alloc_low_pages(unsigned int num)
    {
    unsigned long pfn;
    --
    1.7.7


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