[LEDE-DEV] [PATCH] linux: arc: disable kernel unwinding to fix modules loading

[Alexey Brodkin]

With update of binutils for ARC (this is now based on upstream 2.26)
we noticed issues with loadable kernel modules.

Something like that was happening:
--------------------->8-------------------
mbcache: unknown relocation: 49
insmod: can't insert './mbcache.ko': invalid module format
--------------------->8-------------------

More details could be found in that discussion in binutils mailing list:
http://thread.gmane.org/gmane.comp.gnu.binutils/74662

As of now the simplest work-around is to disable in-kernel unwinder
for now. That will at least allow us to use modules again.

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Vineet Gupta <vgupta at synopsys.com>
Cc: John Crispin <john at phrozen.org>
---
 target/linux/arc770/config-4.4  | 3 +--
 target/linux/archs38/config-4.4 | 4 +---
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/target/linux/arc770/config-4.4 b/target/linux/arc770/config-4.4
index 87fd7e3..d6905d7 100644
--- a/target/linux/arc770/config-4.4
+++ b/target/linux/arc770/config-4.4
@@ -18,7 +18,7 @@ CONFIG_ARC_CURR_IN_REG=y
 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_DW2_UNWIND is not set
 CONFIG_ARC_EMUL_UNALIGNED=y
 # CONFIG_ARC_FPU_SAVE_RESTORE is not set
 CONFIG_ARC_HAS_DCACHE=y
@@ -78,7 +78,6 @@ CONFIG_HAVE_FUTEX_CMPXCHG=y
 CONFIG_HAVE_IOREMAP_PROT=y
 CONFIG_HAVE_LATENCYTOP_SUPPORT=y
 CONFIG_HAVE_MEMBLOCK=y
-CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
 CONFIG_HAVE_NET_DSA=y
 CONFIG_HAVE_OPROFILE=y
 CONFIG_HAVE_PERF_EVENTS=y
diff --git a/target/linux/archs38/config-4.4 b/target/linux/archs38/config-4.4
index 9ea33c6..c7dc264 100644
--- a/target/linux/archs38/config-4.4
+++ b/target/linux/archs38/config-4.4
@@ -15,7 +15,7 @@ CONFIG_ARC_CURR_IN_REG=y
 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_DW2_UNWIND is not set
 CONFIG_ARC_HAS_COH_CACHES=y
 CONFIG_ARC_HAS_DCACHE=y
 # CONFIG_ARC_HAS_DCCM is not set
@@ -85,7 +85,6 @@ CONFIG_HAVE_FUTEX_CMPXCHG=y
 CONFIG_HAVE_IOREMAP_PROT=y
 CONFIG_HAVE_LATENCYTOP_SUPPORT=y
 CONFIG_HAVE_MEMBLOCK=y
-CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
 CONFIG_HAVE_NET_DSA=y
 CONFIG_HAVE_OPROFILE=y
 CONFIG_HAVE_PERF_EVENTS=y
@@ -175,7 +174,6 @@ CONFIG_SRCU=y
 CONFIG_STACKTRACE=y
 CONFIG_STMMAC_ETH=y
 CONFIG_STMMAC_PLATFORM=y
-# CONFIG_SUNXI_SRAM is not set
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_UNINLINE_SPIN_UNLOCK=y
 CONFIG_USB_SUPPORT=y
-- 
2.5.5