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    Subject[PATCH 3.16 70/76] nospec: Include <asm/barrier.h> dependency
    3.16.56-rc1 review patch.  If anyone has any objections, please let me know.

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

    From: Dan Williams <dan.j.williams@intel.com>

    commit eb6174f6d1be16b19cfa43dac296bfed003ce1a6 upstream.

    The nospec.h header expects the per-architecture header file
    <asm/barrier.h> to optionally define array_index_mask_nospec(). Include
    that dependency to prevent inadvertent fallback to the default
    array_index_mask_nospec() implementation.

    The default implementation may not provide a full mitigation
    on architectures that perform data value speculation.

    Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Arjan van de Ven <arjan@linux.intel.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: linux-arch@vger.kernel.org
    Link: http://lkml.kernel.org/r/151881605404.17395.1341935530792574707.stgit@dwillia2-desk3.amr.corp.intel.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    include/linux/nospec.h | 1 +
    1 file changed, 1 insertion(+)

    --- a/include/linux/nospec.h
    +++ b/include/linux/nospec.h
    @@ -5,6 +5,7 @@

    #ifndef _LINUX_NOSPEC_H
    #define _LINUX_NOSPEC_H
    +#include <asm/barrier.h>

    /**
    * array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise
    \
     
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