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5ff8ad3909
This is a follow up to commit c4781dc3d1 ("Kbuild: enable
-fms-extensions") but in a separate change due to being substantially
different from the initial submission.
There are many places within the kernel that use their own CFLAGS
instead of the main KBUILD_CFLAGS, meaning code written with the main
kernel's use of '-fms-extensions' in mind that may be tangentially
included in these areas will result in "error: declaration does not
declare anything" messages from the compiler.
Add '-fms-extensions' to all these areas to ensure consistency, along
with -Wno-microsoft-anon-tag to silence clang's warning about use of the
extension that the kernel cares about using. parisc does not build with
clang so it does not need this warning flag. LoongArch does not need it
either because -W flags from KBUILD_FLAGS are pulled into cflags-vdso.
Reported-by: Christian Brauner <brauner@kernel.org>
Closes: https://lore.kernel.org/20251030-meerjungfrau-getrocknet-7b46eacc215d@brauner/
Reviewed-by: Christian Brauner <brauner@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
169 lines
5.7 KiB
Makefile
169 lines
5.7 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.
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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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KBUILD_CFLAGS += -fPIC
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LDFLAGS_vmlinux := $(call ld-option,-no-pie)
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extra_tools := relocs
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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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ifndef CONFIG_AS_IS_LLVM
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KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
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endif
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KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack -std=gnu11 -fms-extensions
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KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
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KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR
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KBUILD_CFLAGS_DECOMPRESSOR += -Wno-pointer-sign
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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 += -fPIE
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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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KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)
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KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_IS_CLANG),-Wno-microsoft-anon-tag)
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UTS_MACHINE := s390x
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STACK_SIZE := $(if $(CONFIG_KASAN),65536,$(if $(CONFIG_KMSAN),65536,16384))
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CHECKFLAGS += -D__s390__ -D__s390x__
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export LD_BFD
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mflags-$(CONFIG_MARCH_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-$(CONFIG_MARCH_Z15) := -march=z15
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mflags-$(CONFIG_MARCH_Z16) := -march=z16
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mflags-$(CONFIG_MARCH_Z17) := -march=z17
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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_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-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15
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cflags-$(CONFIG_MARCH_Z16_TUNE) += -mtune=z16
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cflags-$(CONFIG_MARCH_Z17_TUNE) += -mtune=z17
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cflags-y += -Wa,-I$(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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KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y)
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KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)
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ifdef CONFIG_EXPOLINE
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ifdef CONFIG_EXPOLINE_EXTERN
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CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern
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CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern
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else
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CC_FLAGS_EXPOLINE := -mindirect-branch=thunk
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CC_FLAGS_EXPOLINE += -mfunction-return=thunk
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endif
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CC_FLAGS_EXPOLINE += -mindirect-branch-table
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export CC_FLAGS_EXPOLINE
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cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE
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aflags-y += -DCC_USING_EXPOLINE
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endif
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ifdef CONFIG_FUNCTION_TRACER
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ifeq ($(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 += -mpacked-stack -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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libs-y += arch/s390/lib/
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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 := $(boot)/bzImage
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install:
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$(call cmd,install)
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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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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 $(extra_tools)
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ifeq ($(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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vdso-install-y += arch/s390/kernel/vdso64/vdso64.so.dbg
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vdso-install-$(CONFIG_COMPAT) += arch/s390/kernel/vdso32/vdso32.so.dbg
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endif
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# Don't use tabs in echo arguments
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define archhelp
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echo '* bzImage - Kernel image for IPL ($(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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