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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ede426923b
With built-in scsi disk driver, the final link fails with a following error: `.exit.text' referenced in section `.rodata' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o This happens with -Os (CONFIG_CC_OPTIMIZE_FOR_SIZE=y) with all gcc-4 versions, and also with -O2 and gcc-4.3. The problem is in sd.c:sd_major() being inlined into __exit function exit_sd(), and the compiler generating a jump table in .rodata section for the 'switch' statement in sd_major(). So we have references to discarded section. Fixed with a big hammer in the form of -fno-jump-tables. Note that jump tables vs. discarded sections is a generic problem, other architectures are just lucky not to suffer from it. But with a slightly more complex switch/case statement it can be reproduced on x86 as well. So maybe at some point we should consider -fno-jump-tables as a generic compile option... Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
70 lines
2.2 KiB
Makefile
70 lines
2.2 KiB
Makefile
#
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# alpha/Makefile
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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#
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NM := $(NM) -B
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LDFLAGS_vmlinux := -static -N #-relax
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CHECKFLAGS += -D__alpha__ -m64
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cflags-y := -pipe -mno-fp-regs -ffixed-8 -msmall-data
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cflags-y += $(call cc-option, -fno-jump-tables)
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cpuflags-$(CONFIG_ALPHA_EV4) := -mcpu=ev4
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cpuflags-$(CONFIG_ALPHA_EV5) := -mcpu=ev5
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cpuflags-$(CONFIG_ALPHA_EV56) := -mcpu=ev56
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cpuflags-$(CONFIG_ALPHA_POLARIS) := -mcpu=pca56
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cpuflags-$(CONFIG_ALPHA_SX164) := -mcpu=pca56
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cpuflags-$(CONFIG_ALPHA_EV6) := -mcpu=ev6
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cpuflags-$(CONFIG_ALPHA_EV67) := -mcpu=ev67
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# If GENERIC, make sure to turn off any instruction set extensions that
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# the host compiler might have on by default. Given that EV4 and EV5
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# have the same instruction set, prefer EV5 because an EV5 schedule is
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# more likely to keep an EV4 processor busy than vice-versa.
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cpuflags-$(CONFIG_ALPHA_GENERIC) := -mcpu=ev5
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cflags-y += $(cpuflags-y)
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# For TSUNAMI, we must have the assembler not emulate our instructions.
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# The same is true for IRONGATE, POLARIS, PYXIS.
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# BWX is most important, but we don't really want any emulation ever.
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KBUILD_CFLAGS += $(cflags-y) -Wa,-mev6
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head-y := arch/alpha/kernel/head.o
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core-y += arch/alpha/kernel/ arch/alpha/mm/
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core-$(CONFIG_MATHEMU) += arch/alpha/math-emu/
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drivers-$(CONFIG_OPROFILE) += arch/alpha/oprofile/
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libs-y += arch/alpha/lib/
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# export what is needed by arch/alpha/boot/Makefile
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LIBS_Y := $(patsubst %/, %/lib.a, $(libs-y))
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export LIBS_Y
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boot := arch/alpha/boot
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#Default target when executing make with no arguments
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all boot: $(boot)/vmlinux.gz
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$(boot)/vmlinux.gz: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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bootimage bootpfile bootpzfile: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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define archhelp
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echo '* boot - Compressed kernel image (arch/alpha/boot/vmlinux.gz)'
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echo ' bootimage - SRM bootable image (arch/alpha/boot/bootimage)'
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echo ' bootpfile - BOOTP bootable image (arch/alpha/boot/bootpfile)'
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echo ' bootpzfile - compressed kernel BOOTP image (arch/alpha/boot/bootpzfile)'
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endef
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