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authorJohn Crispin <john@openwrt.org>2016-04-09 10:25:16 +0000
committerJohn Crispin <john@openwrt.org>2016-04-09 10:25:16 +0000
commit9ef282cd9695f13f88a2a563fcfd6164b4d7ca18 (patch)
treec5fa6619a78010aa0cf8af391d2fb07d37a15fa0
parentcac43c0b715e9742c48ce391ab1ac5152f1e91d5 (diff)
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arc770: enable unaligned access handling simulation in software
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
-rw-r--r--target/linux/arc770/config-4.45
-rw-r--r--target/linux/generic/patches-4.4/333-arc-enable-unaligned-access-in-kernel-mode.patch31
2 files changed, 34 insertions, 2 deletions
diff --git a/target/linux/arc770/config-4.4 b/target/linux/arc770/config-4.4
index c8f021d..87fd7e3 100644
--- a/target/linux/arc770/config-4.4
+++ b/target/linux/arc770/config-4.4
@@ -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
diff --git a/target/linux/generic/patches-4.4/333-arc-enable-unaligned-access-in-kernel-mode.patch b/target/linux/generic/patches-4.4/333-arc-enable-unaligned-access-in-kernel-mode.patch
new file mode 100644
index 0000000..76a9ce8
--- /dev/null
+++ b/target/linux/generic/patches-4.4/333-arc-enable-unaligned-access-in-kernel-mode.patch
@@ -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
+