[Bug 84794] [snb] GTT go slow

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
And correspondingly

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3632743..48a8a69 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -87,6 +87,7 @@ config X86
        select HAVE_USER_RETURN_NOTIFIER
        select ARCH_BINFMT_ELF_RANDOMIZE_PIE
        select HAVE_ARCH_JUMP_LABEL
+       select STOP_MACHINE
        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
        select SPARSE_IRQ
        select GENERIC_FIND_FIRST_BIT

fixes the current kernel.

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