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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>
23 lines
375 B
Makefile
23 lines
375 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for LoongArch KVM support
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#
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ccflags-y += -I $(src)
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include $(srctree)/virt/kvm/Makefile.kvm
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obj-$(CONFIG_KVM) += kvm.o
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kvm-y += exit.o
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kvm-y += interrupt.o
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kvm-y += main.o
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kvm-y += mmu.o
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kvm-y += switch.o
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kvm-y += timer.o
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kvm-y += tlb.o
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kvm-y += vcpu.o
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kvm-y += vm.o
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CFLAGS_exit.o += $(call cc-option,-Wno-override-init,)
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