b668970e61
kernelci.org reports tons of build warnings for linux-next:
35 WARNING: "memcpy" [fs/fat/msdos.ko] has no CRC!
35 WARNING: "__copy_user" [fs/fat/fat.ko] has no CRC!
32 WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol will not be versioned.
32 WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned.
32 WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned.
32 WARNING: EXPORT symbol "__strncpy_from_user_nocheck_asm" [vmlinux] version generation failed, symbol will not be versioned.
The problem here is mainly the missing asm/asm-prototypes.h header file
that is supposed to include the prototypes for each symbol that is exported
from an assembler file.
A second problem is that the asm/uaccess.h header contains some but not
all the necessary declarations for the user access helpers.
Finally, the vdso build is broken once we add asm/asm-prototypes.h, so
we have to fix this at the same time by changing the vdso header. My
approach here is to just not look for exported symbols in the VDSO
assembler files, as the symbols cannot be exported anyway.
Fixes: 576a2f0c5c ("MIPS: Export memcpy & memset functions alongside their definitions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Maciej W. Rozycki <macro@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15038/
Patchwork: https://patchwork.linux-mips.org/patch/15069/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
180 lines
5.0 KiB
Makefile
180 lines
5.0 KiB
Makefile
# Objects to go into the VDSO.
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obj-vdso-y := elf.o gettimeofday.o sigreturn.o
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# Common compiler flags between ABIs.
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ccflags-vdso := \
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$(filter -I%,$(KBUILD_CFLAGS)) \
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$(filter -E%,$(KBUILD_CFLAGS)) \
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$(filter -mmicromips,$(KBUILD_CFLAGS)) \
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$(filter -march=%,$(KBUILD_CFLAGS))
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cflags-vdso := $(ccflags-vdso) \
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$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
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-O2 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
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-DDISABLE_BRANCH_PROFILING \
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$(call cc-option, -fno-stack-protector)
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aflags-vdso := $(ccflags-vdso) \
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-D__ASSEMBLY__ -Wa,-gdwarf-2
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#
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# For the pre-R6 code in arch/mips/vdso/vdso.h for locating
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# the base address of VDSO, the linker will emit a R_MIPS_PC32
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# relocation in binutils > 2.25 but it will fail with older versions
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# because that relocation is not supported for that symbol. As a result
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# of which we are forced to disable the VDSO symbols when building
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# with < 2.25 binutils on pre-R6 kernels. For more references on why we
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# can't use other methods to get the base address of VDSO please refer to
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# the comments on that file.
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#
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ifndef CONFIG_CPU_MIPSR6
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ifeq ($(call ld-ifversion, -lt, 225000000, y),y)
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$(warning MIPS VDSO requires binutils >= 2.25)
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obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
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ccflags-vdso += -DDISABLE_MIPS_VDSO
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endif
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endif
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# VDSO linker flags.
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VDSO_LDFLAGS := \
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-Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 \
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-nostdlib -shared \
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$(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
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$(call cc-ldoption, -Wl$(comma)--build-id)
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GCOV_PROFILE := n
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#
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# Shared build commands.
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#
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quiet_cmd_vdsold = VDSO $@
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cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
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-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
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quiet_cmd_vdsoas_o_S = AS $@
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cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
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# Strip rule for the raw .so files
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$(obj)/%.so.raw: OBJCOPYFLAGS := -S
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$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
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$(call if_changed,objcopy)
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hostprogs-y := genvdso
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quiet_cmd_genvdso = GENVDSO $@
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define cmd_genvdso
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$(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
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$(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
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endef
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#
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# Build native VDSO.
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#
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native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
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targets += $(obj-vdso-y)
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targets += vdso.lds
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targets += vdso.so.dbg.raw vdso.so.raw
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targets += vdso.so.dbg vdso.so
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targets += vdso-image.c
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obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
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$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
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$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
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$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
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$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
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$(call if_changed,vdsold)
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$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
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$(obj)/genvdso FORCE
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$(call if_changed,genvdso)
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obj-y += vdso-image.o
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#
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# Build O32 VDSO.
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#
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# Define these outside the ifdef to ensure they are picked up by clean.
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targets += $(obj-vdso-y:%.o=%-o32.o)
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targets += vdso-o32.lds
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targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
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targets += vdso-o32.so.dbg vdso-o32.so
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targets += vdso-o32-image.c
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ifdef CONFIG_MIPS32_O32
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obj-vdso-o32 := $(obj-vdso-y:%.o=$(obj)/%-o32.o)
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$(obj-vdso-o32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=32
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$(obj-vdso-o32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=32
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$(obj)/%-o32.o: $(src)/%.S FORCE
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$(call if_changed_dep,vdsoas_o_S)
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$(obj)/%-o32.o: $(src)/%.c FORCE
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$(call cmd,force_checksrc)
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$(call if_changed_rule,cc_o_c)
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$(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
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$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
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$(call if_changed,vdsold)
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$(obj)/vdso-o32-image.c: VDSO_NAME := o32
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$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
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$(obj)/genvdso FORCE
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$(call if_changed,genvdso)
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obj-y += vdso-o32-image.o
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endif
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#
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# Build N32 VDSO.
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#
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targets += $(obj-vdso-y:%.o=%-n32.o)
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targets += vdso-n32.lds
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targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
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targets += vdso-n32.so.dbg vdso-n32.so
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targets += vdso-n32-image.c
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ifdef CONFIG_MIPS32_N32
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obj-vdso-n32 := $(obj-vdso-y:%.o=$(obj)/%-n32.o)
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$(obj-vdso-n32): KBUILD_CFLAGS := $(cflags-vdso) -mabi=n32
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$(obj-vdso-n32): KBUILD_AFLAGS := $(aflags-vdso) -mabi=n32
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$(obj)/%-n32.o: $(src)/%.S FORCE
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$(call if_changed_dep,vdsoas_o_S)
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$(obj)/%-n32.o: $(src)/%.c FORCE
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$(call cmd,force_checksrc)
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$(call if_changed_rule,cc_o_c)
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$(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
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$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
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$(call if_changed,vdsold)
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$(obj)/vdso-n32-image.c: VDSO_NAME := n32
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$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
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$(obj)/genvdso FORCE
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$(call if_changed,genvdso)
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obj-y += vdso-n32-image.o
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endif
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# FIXME: Need install rule for debug.
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# Needs to deal with dependency for generation of dbg by cmd_genvdso...
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