4.9-stable review patch. If anyone has any objections, please let me know.
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From: Alexey Brodkin abrodkin@synopsys.com
[ Upstream commit 74c11e300c103af47db5b658fdcf28002421e250 ]
GCC built for arc*-*-linux has "-mmedium-calls" implicitly enabled by default thus we don't see any problems during Linux kernel compilation. ----------------------------->8------------------------ arc-linux-gcc -mcpu=arc700 -Q --help=target | grep calls -mlong-calls [disabled] -mmedium-calls [enabled] ----------------------------->8------------------------
But if we try to use so-called Elf32 toolchain with GCC configured for arc*-*-elf* then we'd see the following failure: ----------------------------->8------------------------ init/do_mounts.o: In function 'init_rootfs': do_mounts.c:(.init.text+0x108): relocation truncated to fit: R_ARC_S21W_PCREL against symbol 'unregister_filesystem' defined in .text section in fs/filesystems.o
arc-elf32-ld: final link failed: Symbol needs debug section which does not exist make: *** [vmlinux] Error 1 ----------------------------->8------------------------
That happens because neither "-mmedium-calls" nor "-mlong-calls" are enabled in Elf32 GCC: ----------------------------->8------------------------ arc-elf32-gcc -mcpu=arc700 -Q --help=target | grep calls -mlong-calls [disabled] -mmedium-calls [disabled] ----------------------------->8------------------------
Now to make it possible to use Elf32 toolchain for building Linux kernel we're explicitly add "-mmedium-calls" to CFLAGS.
And since we add "-mmedium-calls" to the global CFLAGS there's no point in having per-file copies thus removing them.
Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Signed-off-by: Vineet Gupta vgupta@synopsys.com
Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arc/Makefile | 15 +-------------- 1 file changed, 1 insertion(+), 14 deletions(-)
--- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -18,7 +18,7 @@ endif
KBUILD_DEFCONFIG := nsim_700_defconfig
-cflags-y += -fno-common -pipe -fno-builtin -D__linux__ +cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs
@@ -141,16 +141,3 @@ dtbs: scripts
archclean: $(Q)$(MAKE) $(clean)=$(boot) - -# Hacks to enable final link due to absence of link-time branch relexation -# and gcc choosing optimal(shorter) branches at -O3 -# -# vineetg Feb 2010: -mlong-calls switched off for overall kernel build -# However lib/decompress_inflate.o (.init.text) calls -# zlib_inflate_workspacesize (.text) causing relocation errors. -# Thus forcing all exten calls in this file to be long calls -export CFLAGS_decompress_inflate.o = -mmedium-calls -export CFLAGS_initramfs.o = -mmedium-calls -ifdef CONFIG_SMP -export CFLAGS_core.o = -mmedium-calls -endif