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f5711f9df9
s390 is the only architecture which allows to set the
-mwarn-dynamicstack compile option. This however will also always
generate a warning with system call stack randomization, which uses
alloca to generate some random sized stack frame.
On the other hand Linus just enabled "-Werror" by default with commit
3fe617ccaf ("Enable '-Werror' by default for all kernel builds"),
which means compiles will always fail by default.
So instead of playing once again whack-a-mole for something which is
s390 specific, simply remove this option.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
182 lines
6.0 KiB
Makefile
182 lines
6.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# s390/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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#
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# Copyright (C) 1994 by Linus Torvalds
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#
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LD_BFD := elf64-s390
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KBUILD_LDFLAGS := -m elf64_s390
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KBUILD_AFLAGS_MODULE += -fPIC
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KBUILD_CFLAGS_MODULE += -fPIC
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KBUILD_AFLAGS += -m64
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KBUILD_CFLAGS += -m64
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ifeq ($(CONFIG_RELOCATABLE),y)
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KBUILD_CFLAGS += -fPIE
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LDFLAGS_vmlinux := -pie
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endif
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aflags_dwarf := -Wa,-gdwarf-2
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KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
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KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
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KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2
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KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
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KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain
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KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
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KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
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KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
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KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
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KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
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KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
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UTS_MACHINE := s390x
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STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384)
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CHECKFLAGS += -D__s390__ -D__s390x__
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export LD_BFD
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mflags-$(CONFIG_MARCH_Z900) := -march=z900
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mflags-$(CONFIG_MARCH_Z990) := -march=z990
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mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
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mflags-$(CONFIG_MARCH_Z10) := -march=z10
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mflags-$(CONFIG_MARCH_Z196) := -march=z196
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mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12
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mflags-$(CONFIG_MARCH_Z13) := -march=z13
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mflags-$(CONFIG_MARCH_Z14) := -march=z14
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mflags-$(CONFIG_MARCH_Z15) := -march=z15
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export CC_FLAGS_MARCH := $(mflags-y)
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aflags-y += $(mflags-y)
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cflags-y += $(mflags-y)
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cflags-$(CONFIG_MARCH_Z900_TUNE) += -mtune=z900
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cflags-$(CONFIG_MARCH_Z990_TUNE) += -mtune=z990
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cflags-$(CONFIG_MARCH_Z9_109_TUNE) += -mtune=z9-109
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cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10
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cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196
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cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12
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cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13
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cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14
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cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
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cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include
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#
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# Prevent tail-call optimizations, to get clearer backtraces:
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#
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cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls
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ifneq ($(call cc-option,-mpacked-stack -mbackchain -msoft-float),)
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cflags-$(CONFIG_PACK_STACK) += -mpacked-stack -D__PACK_STACK
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aflags-$(CONFIG_PACK_STACK) += -D__PACK_STACK
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endif
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KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
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KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
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ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),)
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cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
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ifeq ($(call cc-option,-mstack-size=8192),)
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cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
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endif
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endif
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ifdef CONFIG_EXPOLINE
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ifneq ($(call cc-option,$(CC_FLAGS_MARCH) -mindirect-branch=thunk),)
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CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
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CC_FLAGS_EXPOLINE += -mfunction-return=thunk
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CC_FLAGS_EXPOLINE += -mindirect-branch-table
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export CC_FLAGS_EXPOLINE
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cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
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aflags-y += -DCC_USING_EXPOLINE
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endif
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endif
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ifdef CONFIG_FUNCTION_TRACER
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ifeq ($(call cc-option,-mfentry -mnop-mcount),)
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# make use of hotpatch feature if the compiler supports it
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cc_hotpatch := -mhotpatch=0,3
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ifneq ($(call cc-option,$(cc_hotpatch)),)
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CC_FLAGS_FTRACE := $(cc_hotpatch)
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KBUILD_AFLAGS += -DCC_USING_HOTPATCH
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KBUILD_CFLAGS += -DCC_USING_HOTPATCH
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endif
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endif
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endif
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# Test CFI features of binutils
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cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)
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KBUILD_CFLAGS += -mbackchain -msoft-float $(cflags-y)
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KBUILD_CFLAGS += -pipe -Wno-sign-compare
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi)
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KBUILD_AFLAGS += $(aflags-y) $(cfi)
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export KBUILD_AFLAGS_DECOMPRESSOR
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export KBUILD_CFLAGS_DECOMPRESSOR
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OBJCOPYFLAGS := -O binary
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head-y := arch/s390/kernel/head64.o
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libs-y += arch/s390/lib/
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drivers-y += drivers/s390/
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boot := arch/s390/boot
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syscalls := arch/s390/kernel/syscalls
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tools := arch/s390/tools
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all: bzImage
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#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg...
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KBUILD_IMAGE := $(boot)/bzImage
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install:
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sh -x $(srctree)/$(boot)/install.sh $(KERNELRELEASE) $(KBUILD_IMAGE) \
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System.map "$(INSTALL_PATH)"
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bzImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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zfcpdump:
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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vdso_install:
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$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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$(Q)$(MAKE) $(clean)=$(tools)
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archheaders:
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$(Q)$(MAKE) $(build)=$(syscalls) uapi
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archprepare:
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$(Q)$(MAKE) $(build)=$(syscalls) kapi
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$(Q)$(MAKE) $(build)=$(tools) kapi
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ifeq ($(KBUILD_EXTMOD),)
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# We need to generate vdso-offsets.h before compiling certain files in kernel/.
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# In order to do that, we should use the archprepare target, but we can't since
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# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
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# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
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# Therefore we need to generate the header after prepare0 has been made, hence
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# this hack.
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prepare: vdso_prepare
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vdso_prepare: prepare0
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$(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h
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$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
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$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)
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endif
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# Don't use tabs in echo arguments
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define archhelp
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echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)'
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echo ' install - Install kernel using'
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echo ' (your) ~/bin/$(INSTALLKERNEL) or'
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echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
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echo ' install to $$(INSTALL_PATH)'
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endef
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