[kernel] use force_sig when handling address errors

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15642 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic-2.6/patches-2.6.29/022-mips_force_sig_address_errors.patch

@@ -0,0 +1,45 @@
+When init is started it is SIGNAL_UNKILLABLE.  If it were to get an
+address error, we would try to send it SIGBUS, but it would be ignored
+and the faulting instruction restarted.  This results in an endless
+loop.
+
+We need to use force_sig() instead so it will actually die and give us
+some useful information.
+
+Reported-by: Florian Fainelli <florian@openwrt.org>
+
+Signed-off-by: David Daney <ddaney@caviumnetworks.com>
+---
+ arch/mips/kernel/unaligned.c |    6 +++---
+ 1 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
+index bf4c4a9..67bd626 100644
+--- a/arch/mips/kernel/unaligned.c
++++ b/arch/mips/kernel/unaligned.c
+@@ -482,19 +482,19 @@ fault:
+ 		return;
+ 
+ 	die_if_kernel("Unhandled kernel unaligned access", regs);
+-	send_sig(SIGSEGV, current, 1);
++	force_sig(SIGSEGV, current);
+ 
+ 	return;
+ 
+ sigbus:
+ 	die_if_kernel("Unhandled kernel unaligned access", regs);
+-	send_sig(SIGBUS, current, 1);
++	force_sig(SIGBUS, current);
+ 
+ 	return;
+ 
+ sigill:
+ 	die_if_kernel("Unhandled kernel unaligned access or invalid instruction", regs);
+-	send_sig(SIGILL, current, 1);
++	force_sig(SIGILL, current);
+ }
+ 
+ asmlinkage void do_ade(struct pt_regs *regs)
+-- 
+1.6.0.6
+