RE: Build breakage with omap2plus_defconfig

-----Original Message-----
From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
owner@vger.kernel.org] On Behalf Of Felipe Balbi
Sent: Friday, January 07, 2011 6:30 PM
To: Santosh Shilimkar
Cc: balbi@ti.com; Russell King; Tony Lindgren; Linux OMAP Mailing
List; Linux ARM Kernel Mailing List
Subject: Re: Build breakage with omap2plus_defconfig

On Fri, Jan 07, 2011 at 06:18:51PM +0530, Santosh Shilimkar wrote:

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-----Original Message-----
From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
owner@vger.kernel.org] On Behalf Of Felipe Balbi
Sent: Friday, January 07, 2011 6:09 PM
To: Russell King; Tony Lindgren
Cc: Linux OMAP Mailing List; Linux ARM Kernel Mailing List
Subject: Build breakage with omap2plus_defconfig

Hi all,

Today's Linus' tree (01539ba2a706ab7d35fc0667dff919ade7f87d63)

fails

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to
build with omap2plus_defconfig:

$ crossmake
  CHK     include/linux/version.h
  CHK     include/generated/utsrelease.h
make[1]: `include/generated/mach-types.h' is up to date.
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CC      arch/arm/kernel/swp_emulate.o
/tmp/cc2V7p5j.s: Assembler messages:
/tmp/cc2V7p5j.s:161: Error: selected processor does not support

ARM

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mode `ldrexb r3,[r4]'
/tmp/cc2V7p5j.s:162: Error: selected processor does not support

ARM

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mode `strexb r0,r2,[r4]'

Well it's not toolchain issue but the omap2plus_defconfig which
selects ARMv6 and ARMV7 together.

If you remove ARCH_OMAP2 from build, it will go through.

I like Catalin's approach:

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 49db8b3..0fe2389 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig

@@ -644,7 +644,7 @@ config ARM_THUMBEE

 config SWP_EMULATE
        bool "Emulate SWP/SWPB instructions"
-       depends on CPU_V7
+       depends on CPU_V7 && !CPU_V6
        select HAVE_PROC_CPU if PROC_FS
        default y if SMP
        help

Simple.