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    Subject[PATCH 3.18 20/52] x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andy Lutomirski <luto@kernel.org>

    commit 1c52d859cb2d417e7216d3e56bb7fea88444cec9 upstream.

    We support various non-Intel CPUs that don't have the CPUID
    instruction, so the M486 test was wrong. For now, fix it with a big
    hammer: handle missing CPUID on all 32-bit CPUs.

    Reported-by: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Matthew Whitehead <tedheadster@gmail.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
    Cc: Andrew Cooper <andrew.cooper3@citrix.com>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: xen-devel <Xen-devel@lists.xen.org>
    Link: http://lkml.kernel.org/r/685bd083a7c036f7769510b6846315b17d6ba71f.1481307769.git.luto@kernel.org
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/x86/include/asm/processor.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/x86/include/asm/processor.h
    +++ b/arch/x86/include/asm/processor.h
    @@ -669,7 +669,7 @@ static inline void sync_core(void)
    {
    int tmp;

    -#ifdef CONFIG_M486
    +#ifdef CONFIG_X86_32
    /*
    * Do a CPUID if available, otherwise do a jump. The jump
    * can conveniently enough be the jump around CPUID.

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