diff options
| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2019-01-16 14:29:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-27 10:07:01 +0100 |
| commit | 812224d6b1fddb567fcbd480f9e35d94d7dad321 (patch) | |
| tree | 0972e4ad5097d2efce24dda1b9f04d7a2fb30b11 /arch/arc | |
| parent | e9f06133d7ddd4788371ec5613f9c577bba8c103 (diff) | |
ARCv2: Enable unaligned access in early ASM code
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: stable@vger.kernel.org #4.4+
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: rewrote changelog]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/kernel/head.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S index 8b90d25a15cc..26e33a8b2d18 100644 --- 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 |