[PATCH v4 5/8] arch/x86/mm/pat: export pat_enabled()

From: Luis R. Rodriguez
Date: Wed Apr 29 2015 - 17:59:09 EST

From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>

Two Linux device drivers cannot work with PAT and the work
required to make them work is significant. There is not
enough motivation to convert these drivers over to use
PAT properly, the compromise reached is to let drivers
that cannot be ported to PAT check if PAT was enabled
and if so fail on probe with a recommendation to boot
with the "nopat" kernel parameter.

Cc: Andy Walls <awalls@xxxxxxxxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
arch/x86/mm/pat.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index b1f9a67..4524b78 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -45,6 +45,7 @@ bool pat_enabled(void)
return !!__pat_enabled;

int pat_debug_enable;


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