tree 84fb5ae53f92bf867d08a168ca35b30ef868eac6
parent cacf021760ee51ef163b1094c9163a863be6b104
author Mark Rutland <mark.rutland@arm.com> 1523531457 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1524205242 +0200

arm64: barrier: Add CSDB macros to control data-value prediction


From: Will Deacon <will.deacon@arm.com>

commit 669474e772b952b14f4de4845a1558fd4c0414a4 upstream.

For CPUs capable of data value prediction, CSDB waits for any outstanding
predictions to architecturally resolve before allowing speculative execution
to continue. Provide macros to expose it to the arch code.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>