commit 2e651ea1596b0ee25af4fcdc4cd13cbb33ffc254
author Vineet Gupta <vgupta@synopsys.com> Wed Jan 23 16:30:36 2013 +0530
committer Vineet Gupta <vgupta@synopsys.com> Fri Feb 15 23:16:06 2013 +0530
tree 51210f1cd80327a00e2fd4b0d20849b6329925d6
parent bf14e3b979a01cd7298d631736f965fe83c6e2bc

ARC: Unaligned access emulation

ARC700 doesn't natively support unaligned access, but can be emulated
-Unaligned Access Exception
-Disassembly at the Fault address to find the exact insn (long/short)

Also per Arnd's comment, we runtime control it using 2 sysctl knobs:
* SYSCTL_ARCH_UNALIGN_ALLOW: Runtime enable/disble
* SYSCTL_ARCH_UNALIGN_NO_WARN: Warn on each emulation attempt

Originally contributed by Tim Yao <tim.yao@amlogic.com>

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Tim Yao <tim.yao@amlogic.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/arc/kernel/disasm.c

diff --git a/arch/arc/kernel/disasm.c b/arch/arc/kernel/disasm.c
index 51bad8f..2f39028 100644
--- a/arch/arc/kernel/disasm.c
+++ b/arch/arc/kernel/disasm.c
@@ -15,7 +15,7 @@
 #include <asm/disasm.h>
 #include <asm/uaccess.h>
 
-#if defined(CONFIG_KGDB) || defined(CONFIG_MISALIGN_ACCESS) || \
+#if defined(CONFIG_KGDB) || defined(CONFIG_ARC_MISALIGN_ACCESS) || \
 	defined(CONFIG_KPROBES)
 
 /* disasm_instr: Analyses instruction at addr, stores