Re: [PATCH] powerpc: clean up binutils version check

The checkbin in arch/powerpc/Makefile errors out if ld <= 2.24.
So, the requirement on PPC is binutils >= 2.25. It is cleaner to
specify it in scripts/min-tool-version.sh. If binutils < 2.25 is
used, the toolchain check will fail in the Kconfig stage going
forward.

Since binutils >= 2.25 is already required, another version test
for --save-restore-funcs on PPC64 is always met.

PPC is the last user of ld-ifversion. With all the callers removed,
the macro definition in scripts/Makefile.compiler can go away.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

  arch/powerpc/Makefile       | 21 ---------------------
  arch/powerpc/lib/Makefile   |  8 --------
  scripts/Makefile.compiler   |  4 ----
  scripts/min-tool-version.sh |  8 +++++++-
  4 files changed, 7 insertions(+), 34 deletions(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 02742facf895..fb607758eeca 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile

@@ -46,13 +46,7 @@ UTS_MACHINE := $(subst $(space),,$(machine-y))
  ifdef CONFIG_PPC32
  KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
  else
-ifeq ($(call ld-ifversion, -ge, 22500, y),y)
-# Have the linker provide sfpr if possible.
-# There is a corresponding test in arch/powerpc/lib/Makefile
  KBUILD_LDFLAGS_MODULE += --save-restore-funcs
-else
-KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
-endif
  endif
  
  ifdef CONFIG_CPU_LITTLE_ENDIAN

@@ -395,8 +389,6 @@ vdso_prepare: prepare0
  		$(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
  endif
  
-archprepare: checkbin
-
  archheaders:
  	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all
  

@@ -411,16 +403,3 @@ else
  	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
  endif
  endif
-
-PHONY += checkbin
-# Check toolchain versions:
-# - gcc-4.6 is the minimum kernel-wide version so nothing required.
-checkbin:
-	@if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
-		"x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
-		echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
-		echo 'in some circumstances.' ; \
-		echo    '*** binutils 2.23 do not define the TOC symbol ' ; \
-		echo -n '*** Please use a different binutils version.' ; \
-		false ; \
-	fi

diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 8560c912186d..5eb3971ccb9c 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile

@@ -38,14 +38,6 @@ obj-$(CONFIG_PPC32)	+= div64.o copy_32.o crtsavres.o
  
  obj-$(CONFIG_FUNCTION_ERROR_INJECTION)	+= error-inject.o
  
-# See corresponding test in arch/powerpc/Makefile
-# 64-bit linker creates .sfpr on demand for final link (vmlinux),
-# so it is only needed for modules, and only for older linkers which
-# do not support --save-restore-funcs
-ifeq ($(call ld-ifversion, -lt, 22500, y),y)
-extra-$(CONFIG_PPC64)	+= crtsavres.o
-endif
-
  obj-$(CONFIG_PPC_BOOK3S_64) += copyuser_power7.o copypage_power7.o \
  			       memcpy_power7.o restart_table.o
  

diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
index 94d0d40cddb3..63e7d79dd877 100644
--- a/scripts/Makefile.compiler
+++ b/scripts/Makefile.compiler

@@ -68,7 +68,3 @@ cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || e
  # ld-option
  # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
  ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
-
-# ld-ifversion
-# Usage:  $(call ld-ifversion, -ge, 22252, y)
-ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))

diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
index 250925aab101..7df9f2150ea1 100755
--- a/scripts/min-tool-version.sh
+++ b/scripts/min-tool-version.sh

@@ -14,7 +14,13 @@ fi
  
  case "$1" in
  binutils)
-	echo 2.23.0
+	if [ "$SRCARCH" = powerpc ]; then