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    SubjectRe: [PATCH v2 2/2] arm64: enable context tracking
    On Wed, May 07, 2014 at 12:32:29AM +0100, Larry Bassel wrote:
    > Make calls to ct_user_enter when the kernel is exited
    > and ct_user_exit when the kernel is entered (in el0_da,
    > el0_ia, el0_svc, el0_irq).

    Why only these entry points? I can reschedule after any exception from EL0,
    so I'd expect all exceptions from userspace to need annotating, no?

    > These macros expand to function calls which will only work
    > properly if el0_sync and related code has been rearranged
    > (in a previous patch of this series).
    >
    > In order to avoid saving registers, the slow syscall path
    > is forced (as x86 does).

    ... and if you decide to handle undef exceptions, I think you'll need
    the register saving too, in case the kernel needs to perform emulation.

    Will


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