4.9-stable patches

added patches:
	kbuild-simplify-ld-option-implementation.patch

diff --git a/queue-4.9/kbuild-simplify-ld-option-implementation.patch b/queue-4.9/kbuild-simplify-ld-option-implementation.patch
new file mode 100644 (file)
index 0000000..fb890d5
--- /dev/null
+++ b/queue-4.9/kbuild-simplify-ld-option-implementation.patch
@@ -0,0 +1,92 @@
+From e9376686d5827beee5a36c47753bf438952a6621 Mon Sep 17 00:00:00 2001
+From: Masahiro Yamada <yamada.masahiro@socionext.com>
+Date: Fri, 23 Feb 2018 13:56:53 +0900
+Subject: kbuild: simplify ld-option implementation
+
+From: Masahiro Yamada <yamada.masahiro@socionext.com>
+
+commit 0294e6f4a0006856e1f36b8cd8fa088d9e499e98 upstream.
+
+Currently, linker options are tested by the coordination of $(CC) and
+$(LD) because $(LD) needs some object to link.
+
+As commit 86a9df597cdd ("kbuild: fix linker feature test macros when
+cross compiling with Clang") addressed, we need to make sure $(CC)
+and $(LD) agree the underlying architecture of the passed object.
+
+This could be a bit complex when we combine tools from different groups.
+For example, we can use clang for $(CC), but we still need to rely on
+GCC toolchain for $(LD).
+
+So, I was searching for a way of standalone testing of linker options.
+A trick I found is to use '-v'; this not only prints the version string,
+but also tests if the given option is recognized.
+
+If a given option is supported,
+
+  $ aarch64-linux-gnu-ld -v --fix-cortex-a53-843419
+  GNU ld (Linaro_Binutils-2017.11) 2.28.2.20170706
+  $ echo $?
+  0
+
+If unsupported,
+
+  $ aarch64-linux-gnu-ld -v --fix-cortex-a53-843419
+  GNU ld (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) 2.23.1
+  aarch64-linux-gnu-ld: unrecognized option '--fix-cortex-a53-843419'
+  aarch64-linux-gnu-ld: use the --help option for usage information
+  $ echo $?
+  1
+
+Gold works likewise.
+
+  $ aarch64-linux-gnu-ld.gold -v --fix-cortex-a53-843419
+  GNU gold (Linaro_Binutils-2017.11 2.28.2.20170706) 1.14
+  masahiro@pug:~/ref/linux$ echo $?
+  0
+  $ aarch64-linux-gnu-ld.gold -v --fix-cortex-a53-999999
+  GNU gold (Linaro_Binutils-2017.11 2.28.2.20170706) 1.14
+  aarch64-linux-gnu-ld.gold: --fix-cortex-a53-999999: unknown option
+  aarch64-linux-gnu-ld.gold: use the --help option for usage information
+  $ echo $?
+  1
+
+LLD too.
+
+  $ ld.lld -v --gc-sections
+  LLD 7.0.0 (http://llvm.org/git/lld.git 4a0e4190e74cea19f8a8dc625ccaebdf8b5d1585) (compatible with GNU linkers)
+  $ echo $?
+  0
+  $ ld.lld -v --fix-cortex-a53-843419
+  LLD 7.0.0 (http://llvm.org/git/lld.git 4a0e4190e74cea19f8a8dc625ccaebdf8b5d1585) (compatible with GNU linkers)
+  $ echo $?
+  0
+  $ ld.lld -v --fix-cortex-a53-999999
+  ld.lld: error: unknown argument: --fix-cortex-a53-999999
+  LLD 7.0.0 (http://llvm.org/git/lld.git 4a0e4190e74cea19f8a8dc625ccaebdf8b5d1585) (compatible with GNU linkers)
+  $ echo $?
+  1
+
+Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
+Tested-by: Nick Desaulniers <ndesaulniers@google.com>
+[nc: try-run-cached was added later, just use try-run, which is the
+     current mainline state]
+Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ scripts/Kbuild.include |    4 +---
+ 1 file changed, 1 insertion(+), 3 deletions(-)
+
+--- a/scripts/Kbuild.include
++++ b/scripts/Kbuild.include
+@@ -166,9 +166,7 @@ cc-ldoption = $(call try-run,\
+ 
+ # ld-option
+ # Usage: LDFLAGS += $(call ld-option, -X)
+-ld-option = $(call try-run,\
+-      $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
+-      $(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
++ld-option = $(call try-run, $(LD) $(LDFLAGS) $(1) -v,$(1),$(2))
+ 
+ # ar-option
+ # Usage: KBUILD_ARFLAGS := $(call ar-option,D)