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mips: fix dynamic ftrace

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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.
This commit is contained in:
Vincent Wiemann 2018-06-10 02:07:33 +02:00
parent 41bba3841b
commit 8526e7570f
2 changed files with 39 additions and 0 deletions
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38
patches/lede/0085-mips-fix-dynamic-ftrace.patch Normal file
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@ -0,0 +1,38 @@
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

1
targets/generic
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@ -25,6 +25,7 @@ config 'CONFIG_PACKAGE_ATH_DEBUG=y'
config 'CONFIG_KERNEL_FTRACE=y'
config 'CONFIG_KERNEL_FUNCTION_TRACER=y'
config 'CONFIG_KERNEL_DYNAMIC_FTRACE=y'
config 'CONFIG_KERNEL_FUNCTION_GRAPH_TRACER=y'
config 'CONFIG_KERNEL_FUNCTION_PROFILER=y'