[meta-ti] [PATCH v2] linux-omap-psp 2.6.32: fix am37x-evm failing build

[Vladimir Zapolskiy]

This change adds an additional patch to the Linux kernel to avoid a
compilation time problem with recent toolchains:

 Error: selected processor does not support ARM mode `smc #0'

With recent toolchains the `smc #0' instruction may be used either in
assembler sources without .arch directive, or `.arch_extension sec' shall
precede it.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy at mentor.com>
---
Changes from v1 to v2:
 * instead of exclusion of problematic pathes this version fixes them,
   one more patch is added

 ...7-add-explicit-.arch_extension-into-assem.patch |   59 ++++++++++++++++++++
 recipes-kernel/linux/linux-omap-psp_2.6.32.bb      |    1 +
 2 files changed, 60 insertions(+)
 create mode 100644 recipes-kernel/linux/linux-omap-psp-2.6.32/0001-ARM-sysfs_v7-add-explicit-.arch_extension-into-assem.patch

diff --git a/recipes-kernel/linux/linux-omap-psp-2.6.32/0001-ARM-sysfs_v7-add-explicit-.arch_extension-into-assem.patch b/recipes-kernel/linux/linux-omap-psp-2.6.32/0001-ARM-sysfs_v7-add-explicit-.arch_extension-into-assem.patch
new file mode 100644
index 0000000..438605f
--- /dev/null
+++ b/recipes-kernel/linux/linux-omap-psp-2.6.32/0001-ARM-sysfs_v7-add-explicit-.arch_extension-into-assem.patch
@@ -0,0 +1,59 @@
+From 9ef8994ca43905bfee6af59e0fb0cedde9872f6c Mon Sep 17 00:00:00 2001
+From: Vladimir Zapolskiy <vladimir_zapolskiy at mentor.com>
+Date: Mon, 23 Jul 2012 22:18:29 +0300
+Subject: [PATCH] ARM: sysfs_v7: add explicit .arch_extension into assembler
+ code
+
+The change fixes a compilation problem with binutils-2.21 or higher:
+
+  Error: selected processor does not support ARM mode `smc #0'
+
+With recent toolchains the `smc #0' instruction may be used either in
+assembler sources without .arch directive, or `.arch_extension sec' shall
+precede it.
+
+Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy at mentor.com>
+---
+ arch/arm/kernel/Makefile   |    1 +
+ arch/arm/kernel/sysfs_v7.c |    6 ++++++
+ 2 files changed, 7 insertions(+)
+
+diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
+index ee20134..bb3bc7e 100644
+--- a/arch/arm/kernel/Makefile
++++ b/arch/arm/kernel/Makefile
+@@ -39,6 +39,7 @@ obj-$(CONFIG_KGDB)		+= kgdb.o
+ obj-$(CONFIG_ARM_UNWIND)	+= unwind.o
+ obj-$(CONFIG_HAVE_TCM)		+= tcm.o
+ obj-$(CONFIG_CPU_V7_SYSFS)	+= sysfs_v7.o
++CFLAGS_sysfs_v7.o	:=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1)
+ 
+ obj-$(CONFIG_CRUNCH)		+= crunch.o crunch-bits.o
+ AFLAGS_crunch-bits.o		:= -Wa,-mcpu=ep9312
+diff --git a/arch/arm/kernel/sysfs_v7.c b/arch/arm/kernel/sysfs_v7.c
+index 5ed32fb..d357b52 100644
+--- a/arch/arm/kernel/sysfs_v7.c
++++ b/arch/arm/kernel/sysfs_v7.c
+@@ -78,6 +78,9 @@ static ssize_t aux_ctl_store(struct sys_device *dev,
+ 	val &= ~2;
+ 	asm ("mov r0,  %0	\n\t"
+ 	     "mov r12, #3	\n\t"
++#ifdef REQUIRES_SEC
++	     ".arch_extension sec\n\t"
++#endif
+ 	     "smc #0		\n\t"
+ 	     :: "r"(val) : "r0", "r12");
+ 
+@@ -109,6 +112,9 @@ static ssize_t l2_aux_ctl_store(struct sys_device *dev,
+ 	SETBITS(val, 0xbc00000, new);
+ 	asm ("mov r0,  %0	\n\t"
+ 	     "mov r12, #2	\n\t"
++#ifdef REQUIRES_SEC
++	     ".arch_extension sec\n\t"
++#endif
+ 	     "smc #0		\n\t"
+ 	     :: "r"(val) : "r0", "r12");
+ 
+-- 
+1.7.10
+
diff --git a/recipes-kernel/linux/linux-omap-psp_2.6.32.bb b/recipes-kernel/linux/linux-omap-psp_2.6.32.bb
index 61fc24f..2cfad0c 100644
--- a/recipes-kernel/linux/linux-omap-psp_2.6.32.bb
+++ b/recipes-kernel/linux/linux-omap-psp_2.6.32.bb
@@ -139,6 +139,7 @@ SRC_URI += "git://arago-project.org/git/projects/linux-omap3.git;protocol=git;br
            file://0001-PSP-3.0.1.6-kernel-source-patched-with-OCF-Linux.patch \
            file://porches.patch \
            file://0001-cgroupfs-create-sys-fs-cgroup-to-mount-cgroupfs-on.patch \
+           file://0001-ARM-sysfs_v7-add-explicit-.arch_extension-into-assem.patch \
            file://defconfig"
 
 SRC_URI_append_beagleboard = " file://logo_linux_clut224.ppm \
-- 
1.7.10