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arc770: enable unaligned access handling simulation in software

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This enables misaligned access handling by software in Linux kernel.

With some wireless drivers (ath9k-htc and mt7601u for example) we see
misaligned accesses here and there and to cope with that without
fixing stuff in the drivers we're just gracefully handling it on ARC.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

SVN-Revision: 49134
This commit is contained in:
John Crispin 2016-04-09 10:25:16 +00:00
parent cac43c0b71
commit 9ef282cd96
2 changed files with 34 additions and 2 deletions
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5
target/linux/arc770/config-4.4
View file

@ -19,7 +19,7 @@ CONFIG_ARC_DBG=y
# CONFIG_ARC_DBG_TLB_MISS_COUNT is not set
# CONFIG_ARC_DBG_TLB_PARANOIA is not set
CONFIG_ARC_DW2_UNWIND=y
# CONFIG_ARC_EMUL_UNALIGNED is not set
CONFIG_ARC_EMUL_UNALIGNED=y
# CONFIG_ARC_FPU_SAVE_RESTORE is not set
CONFIG_ARC_HAS_DCACHE=y
# CONFIG_ARC_HAS_DCCM is not set
@ -162,7 +162,8 @@ CONFIG_SRCU=y
CONFIG_STACKTRACE=y
CONFIG_STMMAC_ETH=y
CONFIG_STMMAC_PLATFORM=y
# CONFIG_SUNXI_SRAM is not set
CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW=y
CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN=y
CONFIG_TICK_CPU_ACCOUNTING=y
CONFIG_UNINLINE_SPIN_UNLOCK=y
CONFIG_USB_SUPPORT=y

31
target/linux/generic/patches-4.4/333-arc-enable-unaligned-access-in-kernel-mode.patch Normal file
View file

@ -0,0 +1,31 @@
From af737b55fc7c61f17da9ae89fba536e0a9338e98 Mon Sep 17 00:00:00 2001
From: Alexey Brodkin <abrodkin@synopsys.com>
Date: Mon, 14 Mar 2016 17:26:34 +0300
Subject: [PATCH] arc: enable unaligned access in kernel mode
This enables misaligned access handling even in kernel mode.
Some wireless drivers (ath9k-htc and mt7601u) use misaligned accesses
here and there and to cope with that without fixing stuff in the drivers
we're just gracefully handling it on ARC.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---
arch/arc/kernel/unaligned.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c
index abd961f..0b0cc97 100644
--- a/arch/arc/kernel/unaligned.c
+++ b/arch/arc/kernel/unaligned.c
@@ -206,7 +206,7 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs,
char buf[TASK_COMM_LEN];
/* handle user mode only and only if enabled by sysadmin */
- if (!user_mode(regs) || !unaligned_enabled)
+ if (!unaligned_enabled)
return 1;
if (no_unaligned_warning) {
--
2.5.0