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>

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index d089c711355a95ca0d365a5c4118e89d70ad9546..fa269622a974e8489c999d0d136057ad4994f71a 100644 (file)
--- 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;