In a multiplatform kernel, one can enable mach-mvebu
together with one or more ARMv6 platforms, which leads
to all files being built for v6. The coherency_ll.S
uses the "dsb" instruction that is only available for
v7, causing a build error in this case. Since the
file is only used on v7 based machines, it is safe
to build it using an ".arch armv7-a" statement.

Without this patch, building allyesconfig results in:

arch/arm/mach-mvebu/coherency_ll.S: Assembler messages:
arch/arm/mach-mvebu/coherency_ll.S:45: Error: selected processor does not support ARM mode `dsb'

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jason Cooper <redacted>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Gregory Clement <redacted>
---
 arch/arm/mach-mvebu/coherency_ll.S |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-mvebu/coherency_ll.S b/arch/arm/mach-mvebu/coherency_ll.S
index 53e8391..7648bda 100644
--- a/arch/arm/mach-mvebu/coherency_ll.S
+++ b/arch/arm/mach-mvebu/coherency_ll.S

@@ -25,6 +25,7 @@
  * r0: Coherency fabric base register address
  * r1: HW CPU id
  */
+	.arch armv7-a
 ENTRY(ll_set_cpu_coherent)
 	/* Create bit by cpu index */
 	mov	r3, #(1 << 24)

-- 
1.7.10.4