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Message-ID: <20070911194257.GA9586@uranus.ravnborg.org>
Date: Tue, 11 Sep 2007 21:42:57 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Andi Kleen <ak@...e.de>
Cc: Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
kbuild devel <kbuild-devel@...ts.sourceforge.net>
Subject: Re: [RFC] kbuild - introduce vdir to make life easier for x86_64
On Tue, Sep 11, 2007 at 12:40:41AM +0200, Andi Kleen wrote:
>
> > The below are the minimal clean-up - a bit more could be done.
> >
> > Comments?
>
> Looks good in principle. My only suggestion would be to name it something
> differently than vdir. I know that's what GNU make calls it, but it's still
> pretty cryptic. How about just fallback-dir ?
>
> Also what would be nice (I don't know if it's doable in make) would
> be a separate variable (e.g. other-obj-... := ) that contains the fallback
> names and that is double checked against the fallback directory. That
> would document it clearly what's going on. Failing that stuffing
> them into a comment would be good at least.
I did not like the vdir hack for a couple of reasons as partly outline by Andi.
So starting to wonder why the obvious did not work.
For mm/Makefile I wanted to do:
diff --git a/arch/x86_64/mm/Makefile b/arch/x86_64/mm/Makefile
index d25ac86..6f4addf 100644
--- a/arch/x86_64/mm/Makefile
+++ b/arch/x86_64/mm/Makefile
@@ -1,11 +1,10 @@
#
# Makefile for the linux x86_64-specific parts of the memory manager.
#
+i386 := ../../../arch/i386/mm
obj-y := init.o fault.o ioremap.o extable.o pageattr.o mmap.o
-obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+obj-$(CONFIG_HUGETLB_PAGE) += $(i386)/hugetlbpage.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_K8_NUMA) += k8topology.o
obj-$(CONFIG_ACPI_NUMA) += srat.o
-
-hugetlbpage-y = ../../i386/mm/hugetlbpage.o
And after wondering a bit I came up with following fix for kbuild:
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index fc498fe..ff03b15 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -46,7 +46,7 @@ multi-objs := $(multi-objs-y) $(multi-objs-m)
# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
# in the local directory
-subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
+subdir-obj-y := $(filter %/built-in.o, $(obj-y))
# $(obj-dirs) is a list of directories that contain object files
obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
subdir-obj-y listed all targets in another dir than current dir
but only needed to list built-in.o targets.
So after fixig this long standing bug in kbuild I could do the attached
cleanup of current x86_64 Makefiles.
I will push the kbuild fix in next merge window but due to the ongoing
merge talk I dunno about the x86_64 patch.
Anyway the kbuild fix needs to be pushed first.
Sam
arch/x86_64/kernel/Makefile | 37 +++++++++++-------------------------
arch/x86_64/kernel/acpi/Makefile | 12 ++++-------
arch/x86_64/kernel/cpufreq/Makefile | 18 +++++------------
arch/x86_64/mm/Makefile | 5 +---
arch/x86_64/pci/Makefile | 24 ++++++-----------------
scripts/Makefile.lib | 2 -
6 files changed, 33 insertions(+), 65 deletions(-)
diff --git a/arch/x86_64/kernel/Makefile b/arch/x86_64/kernel/Makefile
index ff5d8c9..ac27cc4 100644
--- a/arch/x86_64/kernel/Makefile
+++ b/arch/x86_64/kernel/Makefile
@@ -1,25 +1,26 @@
#
# Makefile for the linux kernel.
#
+i386 := ../../../arch/i386/kernel
extra-y := head.o head64.o init_task.o vmlinux.lds
EXTRA_AFLAGS := -traditional
obj-y := process.o signal.o entry.o traps.o irq.o \
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_x86_64.o \
x8664_ksyms.o i387.o syscall.o vsyscall.o \
- setup64.o bootflag.o e820.o reboot.o quirks.o i8237.o \
- pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o bugs.o \
- perfctr-watchdog.o
+ setup64.o $(i386)/bootflag.o e820.o reboot.o $(i386)/quirks.o $(i386)/i8237.o \
+ pci-dma.o pci-nommu.o $(i386)/alternative.o hpet.o tsc.o bugs.o \
+ $(i386)/cpu/perfctr-watchdog.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
-obj-$(CONFIG_X86_MCE) += mce.o therm_throt.o
+obj-$(CONFIG_X86_MCE) += mce.o $(i386)/cpu/mcheck/therm_throt.o
obj-$(CONFIG_X86_MCE_INTEL) += mce_intel.o
obj-$(CONFIG_X86_MCE_AMD) += mce_amd.o
obj-$(CONFIG_MTRR) += ../../i386/kernel/cpu/mtrr/
obj-$(CONFIG_ACPI) += acpi/
-obj-$(CONFIG_X86_MSR) += msr.o
-obj-$(CONFIG_MICROCODE) += microcode.o
-obj-$(CONFIG_X86_CPUID) += cpuid.o
+obj-$(CONFIG_X86_MSR) += $(i386)/msr.o
+obj-$(CONFIG_MICROCODE) += $(i386)/microcode.o
+obj-$(CONFIG_X86_CPUID) += $(i386)/cpuid.o
obj-$(CONFIG_SMP) += smp.o smpboot.o trampoline.o tsc_sync.o
obj-y += apic.o nmi.o
obj-y += io_apic.o mpparse.o genapic.o genapic_flat.o
@@ -41,23 +42,9 @@ obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_PCI) += early-quirks.o
-obj-y += topology.o
-obj-y += intel_cacheinfo.o
-obj-y += addon_cpuid_features.o
-obj-y += pcspeaker.o
+obj-y += $(i386)/topology.o
+obj-y += $(i386)/cpu/intel_cacheinfo.o
+obj-y += $(i386)/cpu/addon_cpuid_features.o
+obj-y += $(i386)/pcspeaker.o
CFLAGS_vsyscall.o := $(PROFILING) -g0
-
-therm_throt-y += ../../i386/kernel/cpu/mcheck/therm_throt.o
-bootflag-y += ../../i386/kernel/bootflag.o
-cpuid-$(subst m,y,$(CONFIG_X86_CPUID)) += ../../i386/kernel/cpuid.o
-topology-y += ../../i386/kernel/topology.o
-microcode-$(subst m,y,$(CONFIG_MICROCODE)) += ../../i386/kernel/microcode.o
-intel_cacheinfo-y += ../../i386/kernel/cpu/intel_cacheinfo.o
-addon_cpuid_features-y += ../../i386/kernel/cpu/addon_cpuid_features.o
-quirks-y += ../../i386/kernel/quirks.o
-i8237-y += ../../i386/kernel/i8237.o
-msr-$(subst m,y,$(CONFIG_X86_MSR)) += ../../i386/kernel/msr.o
-alternative-y += ../../i386/kernel/alternative.o
-pcspeaker-y += ../../i386/kernel/pcspeaker.o
-perfctr-watchdog-y += ../../i386/kernel/cpu/perfctr-watchdog.o
diff --git a/arch/x86_64/kernel/acpi/Makefile b/arch/x86_64/kernel/acpi/Makefile
index 080b996..7879f97 100644
--- a/arch/x86_64/kernel/acpi/Makefile
+++ b/arch/x86_64/kernel/acpi/Makefile
@@ -1,9 +1,7 @@
-obj-y := boot.o
-boot-y := ../../../i386/kernel/acpi/boot.o
-obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o
+i386 := ../../../../arch/i386/kernel/acpi
-ifneq ($(CONFIG_ACPI_PROCESSOR),)
-obj-y += processor.o
-processor-y := ../../../i386/kernel/acpi/processor.o ../../../i386/kernel/acpi/cstate.o
-endif
+obj-y := $(i386)/boot.o
+obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o
+obj-$(CONFIG_ACPI_PROCESSOR) += $(i386)/processor.o
+obj-$(CONFIG_ACPI_PROCESSOR) += $(i386)/cstate.o
diff --git a/arch/x86_64/kernel/cpufreq/Makefile b/arch/x86_64/kernel/cpufreq/Makefile
index 753ce1d..d8dacae 100644
--- a/arch/x86_64/kernel/cpufreq/Makefile
+++ b/arch/x86_64/kernel/cpufreq/Makefile
@@ -2,16 +2,10 @@
# Reuse the i386 cpufreq drivers
#
-SRCDIR := ../../../i386/kernel/cpu/cpufreq
+i386 := ../../../i386/kernel/cpu/cpufreq
-obj-$(CONFIG_X86_POWERNOW_K8) += powernow-k8.o
-obj-$(CONFIG_X86_ACPI_CPUFREQ) += acpi-cpufreq.o
-obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += speedstep-centrino.o
-obj-$(CONFIG_X86_P4_CLOCKMOD) += p4-clockmod.o
-obj-$(CONFIG_X86_SPEEDSTEP_LIB) += speedstep-lib.o
-
-powernow-k8-objs := ${SRCDIR}/powernow-k8.o
-speedstep-centrino-objs := ${SRCDIR}/speedstep-centrino.o
-acpi-cpufreq-objs := ${SRCDIR}/acpi-cpufreq.o
-p4-clockmod-objs := ${SRCDIR}/p4-clockmod.o
-speedstep-lib-objs := ${SRCDIR}/speedstep-lib.o
+obj-$(CONFIG_X86_POWERNOW_K8) += $(i386)/powernow-k8.o
+obj-$(CONFIG_X86_ACPI_CPUFREQ) += $(i386)/acpi-cpufreq.o
+obj-$(CONFIG_X86_SPEEDSTEP_CENTRINO) += $(i386)/speedstep-centrino.o
+obj-$(CONFIG_X86_P4_CLOCKMOD) += $(i386)/p4-clockmod.o
+obj-$(CONFIG_X86_SPEEDSTEP_LIB) += $(i386)/speedstep-lib.o
diff --git a/arch/x86_64/mm/Makefile b/arch/x86_64/mm/Makefile
index d25ac86..6f4addf 100644
--- a/arch/x86_64/mm/Makefile
+++ b/arch/x86_64/mm/Makefile
@@ -1,11 +1,10 @@
#
# Makefile for the linux x86_64-specific parts of the memory manager.
#
+i386 := ../../../arch/i386/mm
obj-y := init.o fault.o ioremap.o extable.o pageattr.o mmap.o
-obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
+obj-$(CONFIG_HUGETLB_PAGE) += $(i386)/hugetlbpage.o
obj-$(CONFIG_NUMA) += numa.o
obj-$(CONFIG_K8_NUMA) += k8topology.o
obj-$(CONFIG_ACPI_NUMA) += srat.o
-
-hugetlbpage-y = ../../i386/mm/hugetlbpage.o
diff --git a/arch/x86_64/pci/Makefile b/arch/x86_64/pci/Makefile
index c9eddc8..6f69df2 100644
--- a/arch/x86_64/pci/Makefile
+++ b/arch/x86_64/pci/Makefile
@@ -3,25 +3,15 @@
#
# Reuse the i386 PCI subsystem
#
+i386 := ../../../arch/i386/pci
EXTRA_CFLAGS += -Iarch/i386/pci
-obj-y := i386.o
-obj-$(CONFIG_PCI_DIRECT)+= direct.o
-obj-y += fixup.o init.o
-obj-$(CONFIG_ACPI) += acpi.o
-obj-y += legacy.o irq.o common.o early.o
+obj-y := $(i386)/i386.o
+obj-$(CONFIG_PCI_DIRECT)+= $(i386)/direct.o
+obj-y += $(i386)/fixup.o init.o
+obj-$(CONFIG_ACPI) += $(i386)/acpi.o
+obj-y += $(i386)/legacy.o $(i386)/irq.o $(i386)/common.o $(i386)/early.o
# mmconfig has a 64bit special
-obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o mmconfig-shared.o
+obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o $(i386)/direct.o $(i386)/mmconfig-shared.o
obj-$(CONFIG_NUMA) += k8-bus.o
-
-direct-y += ../../i386/pci/direct.o
-acpi-y += ../../i386/pci/acpi.o
-legacy-y += ../../i386/pci/legacy.o
-irq-y += ../../i386/pci/irq.o
-common-y += ../../i386/pci/common.o
-fixup-y += ../../i386/pci/fixup.o
-i386-y += ../../i386/pci/i386.o
-init-y += ../../i386/pci/init.o
-early-y += ../../i386/pci/early.o
-mmconfig-shared-y += ../../i386/pci/mmconfig-shared.o
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index fc498fe..ff03b15 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -46,7 +46,7 @@ multi-objs := $(multi-objs-y) $(multi-objs-m)
# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
# in the local directory
-subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
+subdir-obj-y := $(filter %/built-in.o, $(obj-y))
# $(obj-dirs) is a list of directories that contain object files
obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
-
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