From fc333b2df388d6e8791b3ee59c0679e4a131555a Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Wed, 17 Oct 2007 23:30:14 +0200 Subject: kbuild: check asm symlink when building a kernel We often hit the situation where the asm symlink in include/ points to the wrong architecture. In 9 out of 10 cases thats because we forgot to set ARCH but sometimes we just reused the same tree for another ARCH. For the merged x86 tree we need to create a new symlink but this is not obvious. So with the following patch we check if the symlink points to the correct architecture and error out if this is not the case. Signed-off-by: Sam Ravnborg --- Makefile | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 529b9048d97e..feca34c26145 100644 --- a/Makefile +++ b/Makefile @@ -903,14 +903,24 @@ prepare: prepare0 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH) -# FIXME: The asm symlink changes when $(ARCH) changes. That's -# hard to detect, but I suppose "make mrproper" is a good idea -# before switching between archs anyway. - -include/asm: - @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)' - $(Q)if [ ! -d include ]; then mkdir -p include; fi; - @ln -fsn asm-$(SRCARCH) $@ +# The asm symlink changes when $(ARCH) changes. +# Detect this and ask user to run make mrproper + +include/asm: FORCE + $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \ + if [ -L include/asm ]; then \ + if [ "$$asmlink" != "$(SRCARCH)" ]; then \ + echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \ + echo " set ARCH or save .config and run 'make mrproper' to fix it"; \ + exit 1; \ + fi; \ + else \ + echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \ + if [ ! -d include ]; then \ + mkdir -p include; \ + fi; \ + ln -fsn asm-$(SRCARCH) $@; \ + fi # Generate some files # --------------------------------------------------------------------------- -- cgit v1.2.3 From 37ab7a269637086d56940c31968f3fb3389b6d68 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Wed, 17 Oct 2007 16:43:39 -0700 Subject: kbuild: cscope - filter out .tmp_* in find_sources remove .tmp_kallsyms*.S in cscope.files Signed-off-by: Yinghai Lu Signed-off-by: Sam Ravnborg --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index feca34c26145..e8ace82e334f 100644 --- a/Makefile +++ b/Makefile @@ -1351,7 +1351,7 @@ define find-sources find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \ -name $1 -print; \ find $(__srctree) $(RCS_FIND_IGNORE) \ - \( -name include -o -name arch \) -prune -o \ + \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \ -name $1 -print; \ ) endef -- cgit v1.2.3 From 50a8ec31c3a00594ceb7c5f1dcf2ecdaf6a5b847 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Thu, 18 Oct 2007 21:24:21 +0200 Subject: kbuild: disable depmod in cross-compile kernel build MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When building embedded systems in a cross-compile environment and populating a target's file system image, we don't want to run the depmod on the host as we may be building for a completely different architecture. Since there's no such thing as a cross-depmod, we just disable running depmod in the cross-compile case and we just run depmod on the target at bootup. Inspired by patches from Christian, Armin and Deepak. This solves: http://bugzilla.kernel.org/show_bug.cgi?id=3881 Signed-off-by: Sam Ravnborg Cc: Christian Bjølevik Cc: Deepak Saxena and Cc: Armin Kuster , --- Makefile | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index e8ace82e334f..784903a63e0f 100644 --- a/Makefile +++ b/Makefile @@ -1030,19 +1030,12 @@ _modinst_: fi $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst -# If System.map exists, run depmod. This deliberately does not have a -# dependency on System.map since that would run the dependency tree on -# vmlinux. This depmod is only for convenience to give the initial +# This depmod is only for convenience to give the initial # boot a modules.dep even before / is mounted read-write. However the # boot script depmod is the master version. -ifeq "$(strip $(INSTALL_MOD_PATH))" "" -depmod_opts := -else -depmod_opts := -b $(INSTALL_MOD_PATH) -r -endif PHONY += _modinst_post _modinst_post: _modinst_ - if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi + $(call cmd,depmod) else # CONFIG_MODULES @@ -1259,15 +1252,6 @@ _emodinst_: $(Q)mkdir -p $(MODLIB)/$(install-dir) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst -# Run depmod only is we have System.map and depmod is executable -quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) - cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \ - $(DEPMOD) -ae -F System.map \ - $(if $(strip $(INSTALL_MOD_PATH)), \ - -b $(INSTALL_MOD_PATH) -r) \ - $(KERNELRELEASE); \ - fi - PHONY += _emodinst_post _emodinst_post: _emodinst_ $(call cmd,depmod) @@ -1516,6 +1500,16 @@ quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) cmd_rmfiles = rm -f $(rm-files) +# Run depmod only is we have System.map and depmod is executable +# and we build for the host arch +quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) + cmd_depmod = \ + if [ -r System.map -a -x $(DEPMOD) -a "$(SUBARCH)" == "$(ARCH)" ]; then \ + $(DEPMOD) -ae -F System.map \ + $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \ + $(KERNELRELEASE); \ + fi + a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ -- cgit v1.2.3 From 7bb9d092de0b21f8f3f0a20dc2ec84395549fb62 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Fri, 19 Oct 2007 22:20:02 +0200 Subject: kbuild: fix first module build When building a specific module before doing a total kernel build it failed because $(MORVERDIR) were missing. Creating the MODVERDIR explicit (independent of KBUILD_MODULES) fixed this. As a side-effect the MODVERDIR will be created also for a non-module build - but no harm done by that. Signed-off-by: Sam Ravnborg --- Makefile | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 784903a63e0f..6d7527cee9fa 100644 --- a/Makefile +++ b/Makefile @@ -884,10 +884,7 @@ prepare2: prepare3 outputmakefile prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \ include/asm include/config/auto.conf -ifneq ($(KBUILD_MODULES),) - $(Q)mkdir -p $(MODVERDIR) - $(Q)rm -f $(MODVERDIR)/* -endif + $(cmd_crmodverdir) archprepare: prepare1 scripts_basic @@ -1223,8 +1220,7 @@ else # KBUILD_EXTMOD KBUILD_MODULES := 1 PHONY += crmodverdir crmodverdir: - $(Q)mkdir -p $(MODVERDIR) - $(Q)rm -f $(MODVERDIR)/* + $(cmd_crmodverdir) PHONY += $(objtree)/Module.symvers $(objtree)/Module.symvers: @@ -1484,9 +1480,11 @@ endif # Modules / %/: prepare scripts FORCE + $(cmd_crmodverdir) $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ $(build)=$(build-dir) %.ko: prepare scripts FORCE + $(cmd_crmodverdir) $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ $(build)=$(build-dir) $(@:.ko=.o) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost @@ -1510,6 +1508,9 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) $(KERNELRELEASE); \ fi +# Create temporary dir for module support files +cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR); rm -f $(MODVERDIR)/* + a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \ $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ -- cgit v1.2.3