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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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
165 lines
4.9 KiB
Makefile
165 lines
4.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux kernel.
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#
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extra-y += vmlinux.lds
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CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
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ifdef CONFIG_FUNCTION_TRACER
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# Do not profile debug and lowlevel utilities
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CFLAGS_REMOVE_tsc.o = -pg
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CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
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CFLAGS_REMOVE_pvclock.o = -pg
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CFLAGS_REMOVE_kvmclock.o = -pg
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_early_printk.o = -pg
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CFLAGS_REMOVE_head64.o = -pg
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CFLAGS_REMOVE_head32.o = -pg
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CFLAGS_REMOVE_sev.o = -pg
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CFLAGS_REMOVE_rethook.o = -pg
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endif
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KASAN_SANITIZE_head$(BITS).o := n
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KASAN_SANITIZE_dumpstack.o := n
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KASAN_SANITIZE_dumpstack_$(BITS).o := n
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KASAN_SANITIZE_stacktrace.o := n
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KASAN_SANITIZE_paravirt.o := n
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KASAN_SANITIZE_sev.o := n
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# With some compiler versions the generated code results in boot hangs, caused
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# by several compilation units. To be safe, disable all instrumentation.
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KCSAN_SANITIZE := n
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KMSAN_SANITIZE_head$(BITS).o := n
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KMSAN_SANITIZE_nmi.o := n
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KMSAN_SANITIZE_sev.o := n
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# If instrumentation of the following files is enabled, boot hangs during
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# first second.
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KCOV_INSTRUMENT_head$(BITS).o := n
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KCOV_INSTRUMENT_sev.o := n
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CFLAGS_irq.o := -I $(src)/../include/asm/trace
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obj-y += head_$(BITS).o
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obj-y += head$(BITS).o
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obj-y += ebda.o
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obj-y += platform-quirks.o
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obj-y += process_$(BITS).o signal.o signal_$(BITS).o
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obj-y += traps.o idt.o irq.o irq_$(BITS).o dumpstack_$(BITS).o
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obj-y += time.o ioport.o dumpstack.o nmi.o
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obj-$(CONFIG_X86_FRED) += fred.o
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obj-$(CONFIG_MODIFY_LDT_SYSCALL) += ldt.o
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obj-$(CONFIG_X86_KERNEL_IBT) += ibt_selftest.o
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obj-y += setup.o x86_init.o i8259.o irqinit.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_IRQ_WORK) += irq_work.o
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obj-y += probe_roms.o
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obj-$(CONFIG_X86_32) += sys_ia32.o
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obj-$(CONFIG_IA32_EMULATION) += sys_ia32.o signal_32.o
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obj-$(CONFIG_X86_64) += sys_x86_64.o
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obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
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obj-$(CONFIG_SYSFS) += ksysfs.o
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obj-y += bootflag.o e820.o
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obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
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obj-y += alternative.o i8253.o hw_breakpoint.o
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obj-y += tsc.o tsc_msr.o io_delay.o rtc.o
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obj-y += resource.o
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obj-y += irqflags.o
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obj-y += static_call.o
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obj-y += process.o
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obj-y += fpu/
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obj-y += ptrace.o
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obj-$(CONFIG_X86_32) += tls.o
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obj-$(CONFIG_IA32_EMULATION) += tls.o
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obj-y += step.o
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obj-$(CONFIG_INTEL_TXT) += tboot.o
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obj-$(CONFIG_ISA_DMA_API) += i8237.o
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obj-y += stacktrace.o
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obj-y += cpu/
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obj-y += acpi/
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obj-y += reboot.o
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obj-$(CONFIG_X86_MSR) += msr.o
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obj-$(CONFIG_X86_CPUID) += cpuid.o
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obj-$(CONFIG_PCI) += early-quirks.o
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apm-y := apm_32.o
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obj-$(CONFIG_APM) += apm.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SMP) += smpboot.o
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obj-$(CONFIG_X86_TSC) += tsc_sync.o
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obj-$(CONFIG_SMP) += setup_percpu.o
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obj-$(CONFIG_X86_MPPARSE) += mpparse.o
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obj-y += apic/
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obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace_$(BITS).o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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obj-$(CONFIG_X86_TSC) += trace_clock.o
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obj-$(CONFIG_TRACING) += trace.o
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obj-$(CONFIG_RETHOOK) += rethook.o
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obj-$(CONFIG_VMCORE_INFO) += vmcore_info_$(BITS).o
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obj-$(CONFIG_KEXEC_CORE) += machine_kexec_$(BITS).o
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obj-$(CONFIG_KEXEC_CORE) += relocate_kernel_$(BITS).o
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obj-$(CONFIG_KEXEC_FILE) += kexec-bzimage64.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o crash.o
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obj-y += kprobes/
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_X86_32) += doublefault_32.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_VM86) += vm86_32.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_HPET_TIMER) += hpet.o
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obj-$(CONFIG_AMD_NB) += amd_nb.o
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obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o
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obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o
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obj-$(CONFIG_PARAVIRT) += paravirt.o
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obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o
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obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
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obj-$(CONFIG_X86_PMEM_LEGACY_DEVICE) += pmem.o
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obj-$(CONFIG_JAILHOUSE_GUEST) += jailhouse.o
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obj-$(CONFIG_EISA) += eisa.o
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obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
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obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
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obj-$(CONFIG_OF) += devicetree.o
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obj-$(CONFIG_UPROBES) += uprobes.o
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obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
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obj-$(CONFIG_TRACING) += tracepoint.o
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obj-$(CONFIG_SCHED_MC_PRIO) += itmt.o
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obj-$(CONFIG_X86_UMIP) += umip.o
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obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
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obj-$(CONFIG_UNWINDER_FRAME_POINTER) += unwind_frame.o
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obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
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obj-$(CONFIG_AMD_MEM_ENCRYPT) += sev.o
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obj-$(CONFIG_CFI_CLANG) += cfi.o
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obj-$(CONFIG_CALL_THUNKS) += callthunks.o
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obj-$(CONFIG_X86_CET) += cet.o
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obj-$(CONFIG_X86_USER_SHADOW_STACK) += shstk.o
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###
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# 64 bit specific files
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ifeq ($(CONFIG_X86_64),y)
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obj-$(CONFIG_AUDIT) += audit_64.o
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obj-$(CONFIG_GART_IOMMU) += amd_gart_64.o aperture_64.o
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obj-$(CONFIG_MMCONF_FAM10H) += mmconf-fam10h_64.o
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obj-y += vsmp_64.o
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endif
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