[Bug 84794] [snb/ivb/hsw/bdw] GTT go slow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84794

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 86fffe4a61dd972d5a4e23260d530be6da02f614
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Dec 11 13:40:46 2015 -0800

    kernel: remove stop_machine() Kconfig dependency

    Currently the full stop_machine() routine is only enabled on SMP if
    module unloading is enabled, or if the CPUs are hotpluggable.  This
    leads to configurations where stop_machine() is broken as it will then
    only run the callback on the local CPU with irqs disabled, and not stop
    the other CPUs or run the callback on them.

    For example, this breaks MTRR setup on x86 in certain configs since
    ea8596bb2d8d379 ("kprobes/x86: Remove unused text_poke_smp() and
    text_poke_smp_batch() functions") as the MTRR is only established on the
    boot CPU.

    This patch removes the Kconfig option for STOP_MACHINE and uses the SMP
    and HOTPLUG_CPU config options to compile the correct stop_machine() for
    the architecture, removing the false dependency on MODULE_UNLOAD in the
    process.

    Link: https://lkml.org/lkml/2014/10/8/124
    References: https://bugs.freedesktop.org/show_bug.cgi?id=84794

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