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de979c8357
With CONFIG_PREEMPTION disabled, arch/x86/entry/thunk_$(BITS).o becomes
an empty object file.
With some old versions of binutils (i.e., 2.35.90.20210113-1ubuntu1) the
GNU assembler doesn't generate a symbol table for empty object files and
objtool fails with the following error when a valid symbol table cannot
be found:
arch/x86/entry/thunk_64.o: warning: objtool: missing symbol table
To prevent this from happening, build thunk_$(BITS).o only if
CONFIG_PREEMPTION is enabled.
BugLink: https://bugs.launchpad.net/bugs/1911359
Fixes: 320100a5ff ("x86/entry: Remove the TRACE_IRQS cruft")
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/Ys/Ke7EWjcX+ZlXO@arighi-desktop
23 lines
503 B
Makefile
23 lines
503 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the x86 low level entry code
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#
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KASAN_SANITIZE := n
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UBSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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CFLAGS_REMOVE_common.o = $(CC_FLAGS_FTRACE)
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CFLAGS_common.o += -fno-stack-protector
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obj-y := entry.o entry_$(BITS).o syscall_$(BITS).o
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obj-y += common.o
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obj-y += vdso/
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obj-y += vsyscall/
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obj-$(CONFIG_PREEMPTION) += thunk_$(BITS).o
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obj-$(CONFIG_IA32_EMULATION) += entry_64_compat.o syscall_32.o
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obj-$(CONFIG_X86_X32_ABI) += syscall_x32.o
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