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b1992c3772
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
71 lines
2.0 KiB
Makefile
71 lines
2.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for x86-compatible CPU details, features and quirks
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#
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# Don't trace early stages of a secondary CPU boot
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_common.o = -pg
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CFLAGS_REMOVE_perf_event.o = -pg
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endif
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# If these files are instrumented, boot hangs during the first second.
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KCOV_INSTRUMENT_common.o := n
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KCOV_INSTRUMENT_perf_event.o := n
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KMSAN_SANITIZE_common.o := n
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# As above, instrumenting secondary CPU boot code causes boot hangs.
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KCSAN_SANITIZE_common.o := n
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obj-y := cacheinfo.o scattered.o
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obj-y += topology_common.o topology_ext.o topology_amd.o
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obj-y += common.o
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obj-y += rdrand.o
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obj-y += match.o
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obj-y += bugs.o
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obj-y += aperfmperf.o
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obj-y += cpuid-deps.o
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obj-y += umwait.o
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obj-y += capflags.o powerflags.o
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obj-$(CONFIG_X86_LOCAL_APIC) += topology.o
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obj-$(CONFIG_PROC_FS) += proc.o
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obj-$(CONFIG_IA32_FEAT_CTL) += feat_ctl.o
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ifdef CONFIG_CPU_SUP_INTEL
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obj-y += intel.o intel_pconfig.o tsx.o
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obj-$(CONFIG_PM) += intel_epb.o
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endif
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obj-$(CONFIG_CPU_SUP_AMD) += amd.o
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obj-$(CONFIG_CPU_SUP_HYGON) += hygon.o
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obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
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obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
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obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
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obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
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obj-$(CONFIG_CPU_SUP_ZHAOXIN) += zhaoxin.o
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obj-$(CONFIG_CPU_SUP_VORTEX_32) += vortex.o
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obj-$(CONFIG_X86_MCE) += mce/
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obj-$(CONFIG_MTRR) += mtrr/
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obj-$(CONFIG_MICROCODE) += microcode/
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obj-$(CONFIG_X86_CPU_RESCTRL) += resctrl/
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obj-$(CONFIG_X86_SGX) += sgx/
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obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o
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obj-$(CONFIG_HYPERVISOR_GUEST) += vmware.o hypervisor.o mshyperv.o
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obj-$(CONFIG_ACRN_GUEST) += acrn.o
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obj-$(CONFIG_DEBUG_FS) += debugfs.o
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quiet_cmd_mkcapflags = MKCAP $@
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cmd_mkcapflags = $(CONFIG_SHELL) $(src)/mkcapflags.sh $@ $^
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cpufeature = $(src)/../../include/asm/cpufeatures.h
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vmxfeature = $(src)/../../include/asm/vmxfeatures.h
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$(obj)/capflags.c: $(cpufeature) $(vmxfeature) $(src)/mkcapflags.sh FORCE
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$(call if_changed,mkcapflags)
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targets += capflags.c
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