diff options
| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2021-01-14 16:14:01 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-07 14:48:38 +0100 |
| commit | 52b4c58bac0e03732961d6d1c29c21a1eb7364e5 (patch) | |
| tree | afabfef116371f73e2de4ee192c8c3f1af2f7be9 /tools/objtool | |
| parent | 10365001390876ffb846bcbc5b94404928b0f9ca (diff) | |
| download | linux-stable-52b4c58bac0e03732961d6d1c29c21a1eb7364e5.tar.gz linux-stable-52b4c58bac0e03732961d6d1c29c21a1eb7364e5.tar.bz2 linux-stable-52b4c58bac0e03732961d6d1c29c21a1eb7364e5.zip | |
objtool: Don't fail on missing symbol table
[ Upstream commit 1d489151e9f9d1647110277ff77282fe4d96d09b ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/elf.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index b8f3cca8e58b..264d49fea814 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -226,8 +226,11 @@ 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; } symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize; |