linux-kernel - [PATCH 13/18] x86/mm/pat: Export pat

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Date:	Tue, 26 May 2015 10:28:16 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 13/18] x86/mm/pat: Export pat_enabled()

From: "Luis R. Rodriguez" <mcgrof@...e.com>

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.

Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
Cc: Andy Walls <awalls@...metrocast.net>
Cc: Doug Ledford <dledford@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Juergen Gross <jgross@...e.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
Link: http://lkml.kernel.org/r/1430425520-22275-4-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
 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 484dce7f759b..a1c96544099d 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -55,6 +55,7 @@ bool pat_enabled(void)
 {
 	return !!__pat_enabled;
 }
+EXPORT_SYMBOL_GPL(pat_enabled);
 
 int pat_debug_enable;
 
-- 
1.9.0.258.g00eda23

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