linux-kernel - [PATCH 3/7] ARM: mohawk: allow building with MMU disabled

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Date:	Wed, 25 Nov 2015 16:37:51 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 3/7] ARM: mohawk: allow building with MMU disabled

It is in principle possible to build an MMP kernel for
the mohawk CPU with the MMU code disabled, except for one
simple build error:

proc-mohawk.S:345: Error: invalid operands (*UND* and *UND* sections) for `|'
proc-mohawk.S:345: Error: invalid operands (*ABS* and *UND* sections) for `|'
proc-mohawk.S:345: Error: invalid operands (*UND* and *UND* sections) for `|'
proc-mohawk.S:345: Error: invalid operands (*UND* and *UND* sections) for `|'
proc-mohawk.S:345: Error: undefined symbol L_PTE_USER used as an immediate value

This patch changes the proc-mohawk code to do the same as the
other CPUs and not try to actually do anything for the
cpu_mohawk_set_pte_ext function, which won't be used anyway.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/mm/proc-mohawk.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mm/proc-mohawk.S b/arch/arm/mm/proc-mohawk.S
index d65edf717bf7..6f07d2ef4ff2 100644
--- a/arch/arm/mm/proc-mohawk.S
+++ b/arch/arm/mm/proc-mohawk.S
@@ -342,11 +342,13 @@ ENTRY(cpu_mohawk_switch_mm)
  */
 	.align	5
 ENTRY(cpu_mohawk_set_pte_ext)
+#ifdef CONFIG_MMU
 	armv3_set_pte_ext
 	mov	r0, r0
 	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
 	ret	lr
+#endif
 
 .globl	cpu_mohawk_suspend_size
 .equ	cpu_mohawk_suspend_size, 4 * 6
-- 
2.1.0.rc2

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