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Date: Thu, 6 Sep 2012 21:43:27 +0100
From: James Hogan <james@...anarts.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: linux arch <linux-arch@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
linux-kbuild <linux-kbuild@...r.kernel.org>,
Michal Marek <mmarek@...e.cz>,
Richard Weinberger <richard@....at>,
"David S. Miller" <davem@...emloft.net>,
Arnaud Lacombe <lacombar@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Mike Frysinger <vapier@...too.org>,
uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 3/4] kbuild: link of vmlinux moved to a script
Hi Sam,
On Sat, Apr 28, 2012 at 10:59:19PM +0200, Sam Ravnborg wrote:
> From c92ef0a63bb191fb7642e744e8c5865a983713fa Mon Sep 17 00:00:00 2001
> From: Sam Ravnborg <sam@...nborg.org>
> Date: Sat, 28 Apr 2012 20:03:59 +0200
> Subject: [PATCH 3/4] kbuild: link of vmlinux moved to a script
>
> Move the final link of vmlinux to a script to improve
> readability and maintainability of the code.
> The Makefil fragments used to link vmlinux has over the
> years seen far too much changes and the logic was very
> hard to follow.
Unfortunately this doesn't appear to take into account that some
architectures add arguments to the KALLSYMS Makefile variable in their
own Makefiles. For example arch/blackfin/Makefile contains the line:
KALLSYMS += --symbol-prefix=_
The script doesn't include this when it calls ./scripts/kallsyms and as
a result kallsyms_addresses won't correctly override the weak symbol
_kallsyms_addresses on such architectures, and it'll hit the BUG_ONs in
kernel/kallsyms.c when kallsyms is used, e.g. to print a backtrace:
BUG_ON(!kallsyms_addresses);
Any thoughts about what the preferred solution would be? There is a
Kconfig variable CONFIG_SYMBOL_PREFIX which it may be more convenient to
use rather than relying on the architecture's Makefile to adjust the
KALLSYMS command.
Cheers
James
>
> As the process by nature is serialized there was
> nothing gained including this in the Makefile.
>
> "um" has special link requirments - and the
> only was to handle this was to hard-code the linking
> of "um" in the script.
> This was better than trying to modularize it only for the
> benefit of "um" anyway.
>
> The shell script has been improved after input from:
> Arnaud Lacombe <lacombar@...il.com>
> Nick Bowler <nbowler@...iptictech.com>
>
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Cc: Arnaud Lacombe <lacombar@...il.com>
> Cc: Nick Bowler <nbowler@...iptictech.com>
> Cc: Richard Weinberger <richard@....at>
> ---
> Makefile | 215 +++--------------------------------------------
> arch/um/Makefile | 11 +--
> scripts/link-vmlinux.sh | 211 ++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 225 insertions(+), 212 deletions(-)
> create mode 100644 scripts/link-vmlinux.sh
>
> diff --git a/Makefile b/Makefile
> index 00bf5b1..e196ec3 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -341,7 +341,6 @@ AWK = awk
> GENKSYMS = scripts/genksyms/genksyms
> INSTALLKERNEL := installkernel
> DEPMOD = /sbin/depmod
> -KALLSYMS = scripts/kallsyms
> PERL = perl
> CHECK = sparse
>
> @@ -727,191 +726,21 @@ libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
> libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
> libs-y := $(libs-y1) $(libs-y2)
>
> -# externally visible symbols
> +# Externally visible symbols (used by link-vmlinux.sh)
> export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
> export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
> export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
> +export LDFLAGS_vmlinux
>
> -# Build vmlinux
> -# ---------------------------------------------------------------------------
> -# vmlinux is built from the objects selected by $(vmlinux-init) and
> -# $(vmlinux-main). Most are built-in.o files from top-level directories
> -# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
> -# Ordering when linking is important, and $(vmlinux-init) must be first.
> -#
> -# vmlinux
> -# ^
> -# |
> -# +-< $(vmlinux-init)
> -# | +--< init/version.o + more
> -# |
> -# +--< $(vmlinux-main)
> -# | +--< driver/built-in.o mm/built-in.o + more
> -# |
> -# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
> -#
> -# vmlinux version (uname -v) cannot be updated during normal
> -# descending-into-subdirs phase since we do not yet know if we need to
> -# update vmlinux.
> -# Therefore this step is delayed until just before final link of vmlinux -
> -# except in the kallsyms case where it is done just before adding the
> -# symbols to the kernel.
> -#
> -# System.map is generated to document addresses of all kernel symbols
> -
> -vmlinux-init := $(head-y) $(init-y)
> -vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
> -vmlinux-all := $(vmlinux-init) $(vmlinux-main)
> -vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
> -
> -# Rule to link vmlinux - also used during CONFIG_KALLSYMS
> -# May be overridden by arch/$(ARCH)/Makefile
> -quiet_cmd_vmlinux__ ?= LD $@
> - cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
> - -T $(vmlinux-lds) $(vmlinux-init) \
> - --start-group $(vmlinux-main) --end-group \
> - $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
> -
> -# Generate new vmlinux version
> -quiet_cmd_vmlinux_version = GEN .version
> - cmd_vmlinux_version = set -e; \
> - if [ ! -r .version ]; then \
> - rm -f .version; \
> - echo 1 >.version; \
> - else \
> - mv .version .old_version; \
> - expr 0$$(cat .old_version) + 1 >.version; \
> - fi; \
> - $(MAKE) $(build)=init
> -
> -# Generate System.map
> -quiet_cmd_sysmap = SYSMAP
> - cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
> -
> -# Link of vmlinux
> -# If CONFIG_KALLSYMS is set .version is already updated
> -# Generate System.map and verify that the content is consistent
> -# Use + in front of the vmlinux_version rule to silent warning with make -j2
> -# First command is ':' to allow us to use + in front of the rule
> -define rule_vmlinux__
> - :
> - $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
> -
> - $(call cmd,vmlinux__)
> - $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
> -
> - $(Q)$(if $($(quiet)cmd_sysmap), \
> - echo ' $($(quiet)cmd_sysmap) System.map' &&) \
> - $(cmd_sysmap) $@ System.map; \
> - if [ $$? -ne 0 ]; then \
> - rm -f $@; \
> - /bin/false; \
> - fi;
> - $(verify_kallsyms)
> -endef
> -
> -
> -ifdef CONFIG_KALLSYMS
> -# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
> -# It's a three stage process:
> -# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
> -# empty
> -# Running kallsyms on that gives us .tmp_kallsyms1.o with
> -# the right size - vmlinux version (uname -v) is updated during this step
> -# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
> -# but due to the added section, some addresses have shifted.
> -# From here, we generate a correct .tmp_kallsyms2.o
> -# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
> -# o Verify that the System.map from vmlinux matches the map from
> -# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
> -# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
> -# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
> -# temporary bypass to allow the kernel to be built while the
> -# maintainers work out what went wrong with kallsyms.
> -
> -last_kallsyms := 2
> -
> -ifdef KALLSYMS_EXTRA_PASS
> -ifneq ($(KALLSYMS_EXTRA_PASS),0)
> -last_kallsyms := 3
> -endif
> -endif
> -
> -kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
> -
> -define verify_kallsyms
> - $(Q)$(if $($(quiet)cmd_sysmap), \
> - echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
> - $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
> - $(Q)cmp -s System.map .tmp_System.map || \
> - (echo Inconsistent kallsyms data; \
> - echo This is a bug - please report about it; \
> - echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
> - rm .tmp_kallsyms* ; /bin/false )
> -endef
> -
> -# Update vmlinux version before link
> -# Use + in front of this rule to silent warning about make -j1
> -# First command is ':' to allow us to use + in front of this rule
> -cmd_ksym_ld = $(cmd_vmlinux__)
> -define rule_ksym_ld
> - :
> - +$(call cmd,vmlinux_version)
> - $(call cmd,vmlinux__)
> - $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
> -endef
> -
> -# Generate .S file with all kernel symbols
> -quiet_cmd_kallsyms = KSYM $@
> - cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
> - $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
> -
> -.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
> - $(call if_changed_dep,as_o_S)
> +vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
>
> -.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
> - $(call cmd,kallsyms)
> +# Final link of vmlinux
> + cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
> +quiet_cmd_link-vmlinux = LINK $@
>
> -# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
> -.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
> - $(call if_changed_rule,ksym_ld)
> -
> -.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
> - $(call if_changed,vmlinux__)
> -
> -.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
> - $(call if_changed,vmlinux__)
> -
> -# Needs to visit scripts/ before $(KALLSYMS) can be used.
> -$(KALLSYMS): scripts ;
> -
> -# Generate some data for debugging strange kallsyms problems
> -debug_kallsyms: .tmp_map$(last_kallsyms)
> -
> -.tmp_map%: .tmp_vmlinux% FORCE
> - ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
> -
> -.tmp_map3: .tmp_map2
> -
> -.tmp_map2: .tmp_map1
> -
> -endif # ifdef CONFIG_KALLSYMS
> -
> -# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
> -# relevant sections renamed as per the linker script.
> -quiet_cmd_vmlinux-modpost = LD $@
> - cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
> - $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
> - $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
> -define rule_vmlinux-modpost
> - :
> - +$(call cmd,vmlinux-modpost)
> - $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
> - $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
> -endef
> -
> -# vmlinux image - including updated kernel symbols
> -vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
> +# Include targets which we want to
> +# execute if the rest of the kernel build went well.
> +vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
> ifdef CONFIG_HEADERS_CHECK
> $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
> endif
> @@ -921,22 +750,11 @@ endif
> ifdef CONFIG_BUILD_DOCSRC
> $(Q)$(MAKE) $(build)=Documentation
> endif
> - $(call vmlinux-modpost)
> - $(call if_changed_rule,vmlinux__)
> - $(Q)rm -f .old_version
> -
> -# build vmlinux.o first to catch section mismatch errors early
> -ifdef CONFIG_KALLSYMS
> -.tmp_vmlinux1: vmlinux.o
> -endif
> -
> -modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
> -vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
> - $(call if_changed_rule,vmlinux-modpost)
> + +$(call if_changed,link-vmlinux)
>
> # The actual objects are generated when descending,
> # make sure no implicit rule kicks in
> -$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
> +$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>
> # Handle descending into subdirectories listed in $(vmlinux-dirs)
> # Preset locale variables to speed up the build process. Limit locale
> @@ -1160,8 +978,6 @@ endif # CONFIG_MODULES
>
> # Directories & files removed with 'make clean'
> CLEAN_DIRS += $(MODVERDIR)
> -CLEAN_FILES += vmlinux System.map \
> - .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
>
> # Directories & files removed with 'make mrproper'
> MRPROPER_DIRS += include/config usr/include include/generated \
> @@ -1407,6 +1223,7 @@ scripts: ;
> endif # KBUILD_EXTMOD
>
> clean: $(clean-dirs)
> + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
> $(call cmd,rmdirs)
> $(call cmd,rmfiles)
> @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
> @@ -1540,14 +1357,6 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
> cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
> $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
>
> -a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
> - $(KBUILD_AFLAGS_KERNEL) \
> - $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
> - $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
> -
> -quiet_cmd_as_o_S = AS $@
> -cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
> -
> # read all saved command lines
>
> targets := $(wildcard $(sort $(targets)))
> diff --git a/arch/um/Makefile b/arch/um/Makefile
> index 55c0661..0970910 100644
> --- a/arch/um/Makefile
> +++ b/arch/um/Makefile
> @@ -121,15 +121,8 @@ LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
>
> LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
>
> -CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
> -define cmd_vmlinux__
> - $(CC) $(CFLAGS_vmlinux) -o $@ \
> - -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
> - -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
> - -lutil \
> - $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
> - FORCE ,$^) ; rm -f linux
> -endef
> +# Used by link-vmlinux.sh which has special support for um link
> +export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
>
> # When cleaning we don't include .config, so we don't include
> # TT or skas makefiles and don't clean skas_ptregs.h.
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> new file mode 100644
> index 0000000..fb6d058
> --- /dev/null
> +++ b/scripts/link-vmlinux.sh
> @@ -0,0 +1,211 @@
> +#!/bin/sh
> +#
> +# link vmlinux
> +#
> +# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
> +# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
> +# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
> +# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
> +#
> +# vmlinux
> +# ^
> +# |
> +# +-< $(KBUILD_VMLINUX_INIT)
> +# | +--< init/version.o + more
> +# |
> +# +--< $(KBUILD_VMLINUX_MAIN)
> +# | +--< drivers/built-in.o mm/built-in.o + more
> +# |
> +# +-< ${kallsymso} (see description in KALLSYMS section)
> +#
> +# vmlinux version (uname -v) cannot be updated during normal
> +# descending-into-subdirs phase since we do not yet know if we need to
> +# update vmlinux.
> +# Therefore this step is delayed until just before final link of vmlinux.
> +#
> +# System.map is generated to document addresses of all kernel symbols
> +
> +# Error out on error
> +set -e
> +
> +# Nice output in kbuild format
> +# Will be supressed by "make -s"
> +info()
> +{
> + if [ "${quiet}" != "silent_" ]; then
> + printf " %-7s %s\n" ${1} ${2}
> + fi
> +}
> +
> +# Link of vmlinux.o used for section mismatch analysis
> +# ${1} output file
> +modpost_link()
> +{
> + ${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT} \
> + --start-group ${KBUILD_VMLINUX_MAIN} --end-group
> +}
> +
> +# Link of vmlinux
> +# ${1} - optional extra .o files
> +# ${2} - output file
> +vmlinux_link()
> +{
> + local lds="${objtree}/${KBUILD_LDS}"
> +
> + if [ "${SRCARCH}" != "um" ]; then
> + ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
> + -T ${lds} ${KBUILD_VMLINUX_INIT} \
> + --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
> + else
> + ${CC} ${CFLAGS_vmlinux} -o ${2} \
> + -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT} \
> + -Wl,--start-group \
> + ${KBUILD_VMLINUX_MAIN} \
> + -Wl,--end-group \
> + -lutil ${1}
> + rm -f linux
> + fi
> +}
> +
> +
> +# Create ${2} .o file with all symbols from the ${1} object file
> +kallsyms()
> +{
> + info KSYM ${2}
> + local kallsymopt;
> +
> + if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
> + kallsymopt=--all-symbols
> + fi
> +
> + local aflags="${KBUILD_AFLAGS} ${NOSTDINC_FLAGS} \
> + ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
> +
> + ${NM} -n ${1} | \
> + scripts/kallsyms ${kallsymopt} | \
> + ${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
> +}
> +
> +# Create map file with all symbols from ${1}
> +# See mksymap for additional details
> +mksysmap()
> +{
> + ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
> +}
> +
> +# Delete output files in case of error
> +trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM ERR
> +cleanup()
> +{
> + rm -f .old_version
> + rm -f .tmp_System.map
> + rm -f .tmp_kallsyms*
> + rm -f .tmp_version
> + rm -f .tmp_vmlinux*
> + rm -f System.map
> + rm -f vmlinux
> + rm -f vmlinux.o
> +}
> +
> +#
> +#
> +# Use "make V=1" to debug this script
> +case "${KBUILD_VERBOSE}" in
> +*1*)
> + set -x
> + ;;
> +esac
> +
> +if [ "$1" = "clean" ]; then
> + cleanup
> + exit 0
> +fi
> +
> +# We need access to CONFIG_ symbols
> +. ./.config
> +
> +#link vmlinux.o
> +info LD vmlinux.o
> +modpost_link vmlinux.o
> +
> +# modpost vmlinux.o to check for section mismatches
> +${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
> +
> +# Update version
> +info GEN .version
> +if [ ! -r .version ]; then
> + rm -f .version;
> + echo 1 >.version;
> +else
> + mv .version .old_version;
> + expr 0$(cat .old_version) + 1 >.version;
> +fi;
> +
> +# final build of init/
> +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
> +
> +kallsymso=""
> +kallsyms_vmlinux=""
> +if [ -n "${CONFIG_KALLSYMS}" ]; then
> +
> + # kallsyms support
> + # Generate section listing all symbols and add it into vmlinux
> + # It's a three step process:
> + # 1) Link .tmp_vmlinux1 so it has all symbols and sections,
> + # but __kallsyms is empty.
> + # Running kallsyms on that gives us .tmp_kallsyms1.o with
> + # the right size
> + # 2) Link .tmp_vmlinux2 so it now has a __kallsyms section of
> + # the right size, but due to the added section, some
> + # addresses have shifted.
> + # From here, we generate a correct .tmp_kallsyms2.o
> + # 2a) We may use an extra pass as this has been necessary to
> + # woraround some alignment related bugs.
> + # KALLSYMS_EXTRA_PASS=1 is used to trigger this.
> + # 3) The correct ${kallsymso} is linked into the final vmlinux.
> + #
> + # a) Verify that the System.map from vmlinux matches the map from
> + # ${kallsymso}.
> +
> + kallsymso=.tmp_kallsyms2.o
> + kallsyms_vmlinux=.tmp_vmlinux2
> +
> + # step 1
> + vmlinux_link "" .tmp_vmlinux1
> + kallsyms .tmp_vmlinux1 .tmp_kallsyms1.o
> +
> + # step 2
> + vmlinux_link .tmp_kallsyms1.o .tmp_vmlinux2
> + kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
> +
> + # step 2a
> + if [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
> + kallsymso=.tmp_kallsyms3.o
> + kallsyms_vmlinux=.tmp_vmlinux2
> +
> + vmlinux_link .tmp_kallsyms2.o .tmp_vmlinux3
> +
> + kallsyms .tmp_vmlinux3 .tmp_kallsyms3.o
> + fi
> +fi
> +
> +info LD vmlinux
> +vmlinux_link "${kallsymso}" vmlinux
> +
> +info SYSMAP System.map
> +mksysmap vmlinux System.map
> +
> +# step a (see comment above)
> +if [ -n "${CONFIG_KALLSYMS}" ]; then
> + mksysmap ${kallsyms_vmlinux} .tmp_System.map
> +
> + if ! cmp -s System.map .tmp_System.map; then
> + echo Inconsistent kallsyms data
> + echo echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround
> + cleanup
> + exit 1
> + fi
> +fi
> +
> +# We made a new kernel - delete old version file
> +rm -f .old_version
> --
> 1.7.10
>
> --
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