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    SubjectRe: [PATCH 15/37] x86, pkeys: pass VMA down in to fault signal generation code
    On Mon, 16 Nov 2015, Dave Hansen wrote:
    > During a page fault, we look up the VMA to ensure that the fault
    > is in a region with a valid mapping. But, in the top-level page
    > fault code we don't need the VMA for much else. Once we have
    > decided that an access is bad, we are going to send a signal no
    > matter what and do not need the VMA any more. So we do not pass
    > it down in to the signal generation code.
    >
    > But, for protection keys, we need the VMA. It tells us *which*
    > protection key we violated if we get a PF_PK. So, we need to
    > pass the VMA down and fill in siginfo->si_pkey.
    >
    > Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>

    Reviewed-by: Thomas Gleixner <tglx@linutronix.de>


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