cae74ba8c2
Using __builtin_return_address(n) might return undefined values when used with values of n outside of the stack. This was noticed when __builtin_return_address() was called in ftrace on top level functions like the interrupt handlers. As this behaviour cannot be fixed, use the s390 stack unwinder and remove the ftrace compilation flags for unwind_bc.c and stacktrace.c to prevent the unwinding function polluting function traces. Another advantage is that this also works with clang. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
89 lines
3.0 KiB
Makefile
89 lines
3.0 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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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace tracer code
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CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
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# Do not trace early setup code
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CFLAGS_REMOVE_early.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_rethook.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_stacktrace.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_unwind_bc.o = $(CC_FLAGS_FTRACE)
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endif
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GCOV_PROFILE_early.o := n
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KCOV_INSTRUMENT_early.o := n
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UBSAN_SANITIZE_early.o := n
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KASAN_SANITIZE_ipl.o := n
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KASAN_SANITIZE_machine_kexec.o := n
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#
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# Passing null pointers is ok for smp code, since we access the lowcore here.
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#
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CFLAGS_smp.o := -Wno-nonnull
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#
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# Disable tailcall optimizations for stack / callchain walking functions
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# since this might generate broken code when accessing register 15 and
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# passing its content to other functions.
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#
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CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
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CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
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CFLAGS_unwind_bc.o += -fno-optimize-sibling-calls
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obj-y := head64.o traps.o time.o process.o earlypgm.o early.o setup.o idle.o vtime.o
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obj-y += processor.o syscall.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
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obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o cpufeature.o
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obj-y += sysinfo.o lgr.o os_info.o ctlreg.o
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obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
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obj-y += entry.o reipl.o kdebugfs.o alternative.o
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obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
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obj-y += smp.o text_amode31.o stacktrace.o abs_lowcore.o facility.o
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extra-y += vmlinux.lds
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obj-$(CONFIG_SYSFS) += nospec-sysfs.o
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CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o
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obj-$(CONFIG_NUMA) += numa.o
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obj-$(CONFIG_AUDIT) += audit.o
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compat-obj-$(CONFIG_AUDIT) += compat_audit.o
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obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o
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obj-$(CONFIG_COMPAT) += $(compat-obj-y)
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KPROBES) += kprobes_insn_page.o
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obj-$(CONFIG_KPROBES) += mcount.o
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obj-$(CONFIG_RETHOOK) += rethook.o
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obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o
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obj-$(CONFIG_VMCORE_INFO) += vmcore_info.o
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obj-$(CONFIG_UPROBES) += uprobes.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
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obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o
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obj-$(CONFIG_CERT_STORE) += cert_store.o
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obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o
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obj-$(CONFIG_PERF_EVENTS) += perf_pai_crypto.o perf_pai_ext.o
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obj-$(CONFIG_TRACEPOINTS) += trace.o
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obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) += uv.o
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# vdso
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obj-y += vdso64/
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obj-$(CONFIG_COMPAT) += vdso32/
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