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c0dd671686
Code which runs outside the kernel's normal mode of operation often does unusual things which can cause a static analysis tool like objtool to emit false positive warnings: - boot image - vdso image - relocation - realmode - efi - head - purgatory - modpost Set OBJECT_FILES_NON_STANDARD for their related files and directories, which will tell objtool to skip checking them. It's ok to skip them because they don't affect runtime stack traces. Also skip the following code which does the right thing with respect to frame pointers, but is too "special" to be validated by a tool: - entry - mcount Also skip the test_nx module because it modifies its exception handling table at runtime, which objtool can't understand. Fortunately it's just a test module so it doesn't matter much. Currently objtool is the only user of OBJECT_FILES_NON_STANDARD, but it might eventually be useful for other tools. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris J Arges <chris.j.arges@canonical.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Marek <mmarek@suse.cz> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Pedro Alves <palves@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/366c080e3844e8a5b6a0327dc7e8c2b90ca3baeb.1456719558.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
51 lines
1.3 KiB
Makefile
51 lines
1.3 KiB
Makefile
OBJECT_FILES_NON_STANDARD := y
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hostprogs-y := modpost mk_elfconfig
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always := $(hostprogs-y) empty.o
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modpost-objs := modpost.o file2alias.o sumversion.o
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devicetable-offsets-file := devicetable-offsets.h
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define sed-y
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"/^->/{s:->#\(.*\):/* \1 */:; \
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s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
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s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
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s:->::; p;}"
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endef
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quiet_cmd_offsets = GEN $@
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define cmd_offsets
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(set -e; \
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echo "#ifndef __DEVICETABLE_OFFSETS_H__"; \
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echo "#define __DEVICETABLE_OFFSETS_H__"; \
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echo "/*"; \
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echo " * DO NOT MODIFY."; \
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echo " *"; \
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echo " * This file was generated by Kbuild"; \
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echo " *"; \
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echo " */"; \
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echo ""; \
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sed -ne $(sed-y) $<; \
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echo ""; \
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echo "#endif" ) > $@
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endef
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$(obj)/$(devicetable-offsets-file): $(obj)/devicetable-offsets.s
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$(call if_changed,offsets)
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targets += $(devicetable-offsets-file) devicetable-offsets.s
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# dependencies on generated files need to be listed explicitly
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$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o: $(obj)/elfconfig.h
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$(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)
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quiet_cmd_elfconfig = MKELF $@
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cmd_elfconfig = $(obj)/mk_elfconfig < $< > $@
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$(obj)/elfconfig.h: $(obj)/empty.o $(obj)/mk_elfconfig FORCE
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$(call if_changed,elfconfig)
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targets += elfconfig.h
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