From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 9 Jun 2016 17:09:23 +0000 (+0200)
Subject: kernel: fix mips MT_SMP kernel crash on cache flush
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=eed2f24c0d1138e9c46befd464548de538f0bb60;p=openwrt%2Fstaging%2Fthess.git

kernel: fix mips MT_SMP kernel crash on cache flush

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/target/linux/generic/patches-4.4/100-MIPS-fix-MT_SMP-cacheflush.patch b/target/linux/generic/patches-4.4/100-MIPS-fix-MT_SMP-cacheflush.patch
new file mode 100644
index 0000000000..14a10ba147
--- /dev/null
+++ b/target/linux/generic/patches-4.4/100-MIPS-fix-MT_SMP-cacheflush.patch
@@ -0,0 +1,17 @@
+Fix crash on cache flush with the MT_SMP variant
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+
+--- a/arch/mips/mm/c-r4k.c
++++ b/arch/mips/mm/c-r4k.c
+@@ -60,8 +60,10 @@ static inline void r4k_on_each_cpu(void
+ 	 * to restrict that call when a CM is not present because both
+ 	 * CM-based SMP protocols (CMP & CPS) restrict index-based cache ops.
+ 	 */
++#ifndef CONFIG_MIPS_MT_SMP
+ 	if (!mips_cm_present())
+ 		smp_call_function_many(&cpu_foreign_map, func, info, 1);
++#endif
+ 	func(info);
+ 	preempt_enable();
+ }