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authorJosh Poimboeuf <jpoimboe@redhat.com>2021-01-14 16:14:01 -0600
committerJosh Poimboeuf <jpoimboe@redhat.com>2021-01-21 15:49:58 -0600
commit1d489151e9f9d1647110277ff77282fe4d96d09b (patch)
treebe12758e05f70ca75ca391f9219a7015a6247f6a /tools
parent655cf86548a3938538642a6df27dd359e13c86bd (diff)
objtool: Don't fail on missing symbol table
Thanks to a recent binutils change which doesn't generate unused symbols, it's now possible for thunk_64.o be completely empty without CONFIG_PREEMPTION: no text, no data, no symbols. We could edit the Makefile to only build that file when CONFIG_PREEMPTION is enabled, but that will likely create confusion if/when the thunks end up getting used by some other code again. Just ignore it and move on. Reported-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Link: https://github.com/ClangBuiltLinux/linux/issues/1254 Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/objtool/elf.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index f9682db33cca..d8421e1d06be 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -380,8 +380,11 @@ static int read_symbols(struct elf *elf)
symtab = find_section_by_name(elf, ".symtab");
if (!symtab) {
- WARN("missing symbol table");
- return -1;
+ /*
+ * A missing symbol table is actually possible if it's an empty
+ * .o file. This can happen for thunk_64.o.
+ */
+ return 0;
}
symtab_shndx = find_section_by_name(elf, ".symtab_shndx");