4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eugeniy Paltsev <eugeniy.palt...@synopsys.com>
commit 252f6e8eae909bc075a1b1e3b9efb095ae4c0b56 upstream.
It is currently done in arc_init_IRQ() which might be too late
considering gcc 7.3.1 onwards (GNU 2018.03) generates unaligned
memory accesses by default
Cc: sta...@vger.kernel.org #4.4+
Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com>
Signed-off-by: Vineet Gupta <vgu...@synopsys.com>
[vgupta: rewrote changelog]
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arc/kernel/head.S | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -17,6 +17,7 @@
#include <asm/entry.h>
#include <asm/arcregs.h>
#include <asm/cache.h>
+#include <asm/irqflags.h>
.macro CPU_EARLY_SETUP
@@ -47,6 +48,15 @@
sr r5, [ARC_REG_DC_CTRL]
1:
+
+#ifdef CONFIG_ISA_ARCV2
+ ; Unaligned access is disabled at reset, so re-enable early as
+ ; gcc 7.3.1 (ARC GNU 2018.03) onwards generates unaligned access
+ ; by default
+ lr r5, [status32]
+ bset r5, r5, STATUS_AD_BIT
+ kflag r5
+#endif
.endm
.section .init.text, "ax",@progbits
