x86/mm/pat: Export pat_enabled()

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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Andy Walls <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Doug Ledford <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 484dce7f759be9693923ced45bbc8f6954c46831..a1c96544099d27a550451da9ba3120e957231fb3 100644 (file)
--- 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;