nospec: Include <asm/barrier.h> dependency
authorDan Williams <dan.j.williams@intel.com>
Fri, 16 Feb 2018 21:20:54 +0000 (13:20 -0800)
committerIngo Molnar <mingo@kernel.org>
Sat, 17 Feb 2018 07:40:59 +0000 (08:40 +0100)
commiteb6174f6d1be16b19cfa43dac296bfed003ce1a6
treece6231dba0ffc07dbb02fb0e8b3545b129cd9c15
parentb98c6a160a057d5686a8c54c79cc6c8c94a7d0c8
nospec: Include <asm/barrier.h> dependency

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>
include/linux/nospec.h