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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>
42 lines
1.2 KiB
Makefile
42 lines
1.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for Kernel-based Virtual Machine module
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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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obj-$(CONFIG_KVM) += hyp/
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kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
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inject_fault.o va_layout.o handle_exit.o \
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guest.o debug.o reset.o sys_regs.o stacktrace.o \
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vgic-sys-reg-v3.o fpsimd.o pkvm.o \
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arch_timer.o trng.o vmid.o emulate-nested.o nested.o \
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vgic/vgic.o vgic/vgic-init.o \
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vgic/vgic-irqfd.o vgic/vgic-v2.o \
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vgic/vgic-v3.o vgic/vgic-v4.o \
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vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \
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vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \
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vgic/vgic-its.o vgic/vgic-debug.o
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kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o
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always-y := hyp_constants.h hyp-constants.s
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define rule_gen_hyp_constants
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$(call filechk,offsets,__HYP_CONSTANTS_H__)
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endef
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CFLAGS_hyp-constants.o = -I $(src)/hyp/include
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$(obj)/hyp-constants.s: $(src)/hyp/hyp-constants.c FORCE
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$(call if_changed_dep,cc_s_c)
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$(obj)/hyp_constants.h: $(obj)/hyp-constants.s FORCE
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$(call if_changed_rule,gen_hyp_constants)
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obj-kvm := $(addprefix $(obj)/, $(kvm-y))
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$(obj-kvm): $(obj)/hyp_constants.h
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