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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2021-01-15 01:14:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-07 16:47:41 +0300 |
| commit | 536aea4013d50a4768262430e30c047818e57380 (patch) | |
| tree | d50c4311ccdf118f8f3121598175c428d13e4275 /tools | |
| parent | 85969e0bb3e6bdb9230882f98715422b353ef701 (diff) | |
| download | linux-536aea4013d50a4768262430e30c047818e57380.tar.xz | |
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')
| -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 d089c711355a..fa269622a974 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; |