From: Vincent Wiemann <webmaster@codefetch.de>
Date: Sun, 10 Jun 2018 02:01:08 +0200
Subject: mips: fix dynamic ftrace

The kernel patch *-mips_module_reloc.patch breaks dynamic ftrace as
dynamic ftrace depends on -mlong-calls.
See http://patchwork.linux-mips.org/patch/675/
Thus we always set -mlong-calls if the kernel is being
compiled with dynamic ftrace support.

diff --git a/target/linux/generic/patches-4.4/305-mips_module_reloc.patch b/target/linux/generic/patches-4.4/305-mips_module_reloc.patch
index 944921fff7a0d0d33515cb84a2cb81e9cca42d0e..c16005ff2169aad20fe32261841a6d07f4ac3bed 100644
--- a/target/linux/generic/patches-4.4/305-mips_module_reloc.patch
+++ b/target/linux/generic/patches-4.4/305-mips_module_reloc.patch
@@ -1,6 +1,6 @@
 --- a/arch/mips/Makefile
 +++ b/arch/mips/Makefile
-@@ -90,8 +90,13 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
+@@ -90,8 +90,18 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
  cflags-y			+= -G 0 -mno-abicalls -fno-pic -pipe -mno-branch-likely
  cflags-y			+= -msoft-float
  LDFLAGS_vmlinux			+= -G 0 -static -n -nostdlib --gc-sections
@@ -8,8 +8,13 @@
  KBUILD_AFLAGS_MODULE		+= -mlong-calls
  KBUILD_CFLAGS_MODULE		+= -mlong-calls
 +else
-+KBUILD_AFLAGS_MODULE		+= -mno-long-calls
-+KBUILD_CFLAGS_MODULE		+= -mno-long-calls
++  ifdef CONFIG_DYNAMIC_FTRACE
++    KBUILD_AFLAGS_MODULE		+= -mlong-calls
++    KBUILD_CFLAGS_MODULE		+= -mlong-calls
++  else
++    KBUILD_AFLAGS_MODULE		+= -mno-long-calls
++    KBUILD_CFLAGS_MODULE		+= -mno-long-calls
++  endif
 +endif
  
  ifndef CONFIG_FUNCTION_TRACER