Commit-ID: fbe7193aa4787f27c84216d130ab877efc310d57
Gitweb: http://git.kernel.org/tip/fbe7193aa4787f27c84216d130ab877efc310d57
Author: Luis R. Rodriguez <mcgrof@xxxxxxxx>
AuthorDate: Tue, 26 May 2015 10:28:16 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 27 May 2015 14:41:02 +0200
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 <mcgrof@xxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Andy Walls <awalls@xxxxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1430425520-22275-4-git-send-email-mcgrof@xxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1432628901-18044-14-git-send-email-bp@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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 484dce7..a1c9654 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;
--
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