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    Subject[tip:x86/mm] x86/mm/pat: Export pat_enabled()
    Commit-ID:  fbe7193aa4787f27c84216d130ab877efc310d57
    Gitweb: http://git.kernel.org/tip/fbe7193aa4787f27c84216d130ab877efc310d57
    Author: Luis R. Rodriguez <mcgrof@suse.com>
    AuthorDate: Tue, 26 May 2015 10:28:16 +0200
    Committer: Ingo Molnar <mingo@kernel.org>
    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@suse.com>
    Signed-off-by: Borislav Petkov <bp@suse.de>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Andy Walls <awalls@md.metrocast.net>
    Cc: Bjorn Helgaas <bhelgaas@google.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Dave Airlie <airlied@redhat.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Doug Ledford <dledford@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Michael S. Tsirkin <mst@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1430425520-22275-4-git-send-email-mcgrof@do-not-panic.com
    Link: http://lkml.kernel.org/r/1432628901-18044-14-git-send-email-bp@alien8.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    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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