a74b6c0e53
In order to work around the existence of a vmap symbol in libpcap, the UML makefile unconditionally redefines vmap to kernel_vmap. However, this not only affects the actual vmap symbol, but also anything else named vmap, including a number of struct members in DRM. This would not be too much of a problem, since all uses are also updated, except we now have Rust DRM bindings, which expect the corresponding Rust structs to have 'vmap' names. Since the redefinition applies in bindgen, but not to Rust code, we end up with errors such as: error[E0560]: struct `drm_gem_object_funcs` has no fields named `vmap` --> rust/kernel/drm/gem/mod.rs:210:9 Since libpcap support was removed in commit12b8e7e69a("um: Remove obsolete pcap driver"), remove the, now unnecessary, define as well. We also take this opportunity to update the comment. Signed-off-by: David Gow <davidgow@google.com> Acked-by: Miguel Ojeda <ojeda@kernel.org> Link: https://patch.msgid.link/20251122083213.3996586-1-davidgow@google.com Fixes:12b8e7e69a("um: Remove obsolete pcap driver") [adjust commmit message a bit] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
156 lines
5.0 KiB
Makefile
156 lines
5.0 KiB
Makefile
#
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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) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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# Licensed under the GPL
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#
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# select defconfig based on actual architecture
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ifeq ($(SUBARCH),x86)
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ifeq ($(shell uname -m),x86_64)
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KBUILD_DEFCONFIG := x86_64_defconfig
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else
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KBUILD_DEFCONFIG := i386_defconfig
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endif
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else
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KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
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endif
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ARCH_DIR := arch/um
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# We require bash because the vmlinux link and loader script cpp use bash
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# features.
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SHELL := bash
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MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
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HEADER_ARCH := $(SUBARCH)
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ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
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HEADER_ARCH := x86
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endif
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ifdef CONFIG_64BIT
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KBUILD_CFLAGS += -mcmodel=large
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endif
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HOST_DIR := arch/$(HEADER_ARCH)
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include $(srctree)/$(ARCH_DIR)/Makefile-skas
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include $(srctree)/$(HOST_DIR)/Makefile.um
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core-y += $(HOST_DIR)/um/
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SHARED_HEADERS := $(ARCH_DIR)/include/shared
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ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
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ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
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KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
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# -Dstrrchr=kernel_strrchr (as well as the various in6addr symbols) prevents
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# anything from referencing
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# libc symbols with the same name, which can cause a linker error.
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#
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# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
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# embedded copy of longjmp, same thing for setjmp.
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#
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# These apply to USER_CFLAGS too.
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KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) \
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-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
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-Din6addr_loopback=kernel_in6addr_loopback \
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-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \
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-D__close_range=kernel__close_range
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KBUILD_RUSTFLAGS += -Crelocation-model=pie
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KBUILD_AFLAGS += $(ARCH_INCLUDE)
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USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
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-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
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-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ \
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-include $(srctree)/include/linux/compiler-version.h \
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-include $(srctree)/include/linux/kconfig.h
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#This will adjust *FLAGS accordingly to the platform.
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include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
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KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
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-I$(srctree)/$(HOST_DIR)/include/uapi \
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-I$(objtree)/$(HOST_DIR)/include/generated \
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-I$(objtree)/$(HOST_DIR)/include/generated/uapi
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# -Derrno=kernel_errno - This turns all kernel references to errno into
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# kernel_errno to separate them from the libc errno. This allows -fno-common
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# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
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# errnos.
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# These apply to kernelspace only.
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#
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# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
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# defines more robust
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KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
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-Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
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KBUILD_CFLAGS += $(KERNEL_DEFINES)
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PHONY += linux
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all: linux
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linux: vmlinux
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@echo ' LINK $@'
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$(Q)ln -f $< $@
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define archhelp
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echo '* linux - Binary kernel image (./linux) - for backward'
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echo ' compatibility only, this creates a hard link to the'
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echo ' real kernel binary, the "vmlinux" binary you'
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echo ' find in the kernel root.'
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endef
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archheaders:
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$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
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archprepare:
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$(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
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LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -no-pie
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LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
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CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
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-fno-stack-protector $(call cc-option, -fno-stack-protector-all)
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# Options used by linker script
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export LDS_START := $(START)
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export LDS_ELF_ARCH := $(ELF_ARCH)
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export LDS_ELF_FORMAT := $(ELF_FORMAT)
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# The wrappers will select whether using "malloc" or the kernel allocator.
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LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
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# Avoid binutils 2.39+ warnings by marking the stack non-executable and
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# ignorning warnings for the kallsyms sections.
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LDFLAGS_EXECSTACK = -z noexecstack
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ifeq ($(CONFIG_LD_IS_BFD),y)
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LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
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endif
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LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
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# Used by link-vmlinux.sh which has special support for um link
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export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
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# When cleaning we don't include .config, so we don't include
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# TT or skas makefiles and don't clean skas_ptregs.h.
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CLEAN_FILES += linux x.i gmon.out
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MRPROPER_FILES += $(HOST_DIR)/include/generated
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archclean:
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@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
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-o -name '*.gcov' \) -type f -print | xargs rm -f
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$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) clean
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export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH
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