linux-kernel - [PATCH 02/15] ARM: mvebu: build coherency

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Date:	Mon, 21 Jan 2013 17:15:55 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, arm@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Subject: [PATCH 02/15] ARM: mvebu: build coherency_ll.S for arch=armv7-a

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@...db.de>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Gregory Clement <gregory.clement@...e-electrons.com>
---
 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

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