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    SubjectRe: [PATCH] arm: cmpxchg syscall should data abort if page not write or not young
    Dear Russell King,

    On Mon, Mar 14, 2011 at 6:40 PM, Russell King - ARM Linux
    <linux@arm.linux.org.uk> wrote:
    > On Mon, Mar 14, 2011 at 06:28:36PM +0800, Po-Yu Chuang wrote:
    >> From: Po-Yu Chuang <ratbert@faraday-tech.com>
    >>
    >> If the page to cmpxchg is user mode read only (not write)
    >> or invalid (not young), we should simulate a data abort first.
    >
    > No.  If it is not young then it should be made young.  Age is an effect
    > of accesses.  It's not a permission.

    OK, I will rethink about the not young part.
    Thanks for your pointer.

    I will resubmit a v2 which contains only the read only check.
    It fixes a problem we met with futex.

    best regards,
    Po-Yu Chuang
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