objtool: Don't fail on missing symbol table

stable inclusion
from stable-5.10.12
commit c6fd968f58439398b765300aecd7758d501ee49c
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5Q0UG?from=project-issue
CVE: NA

--------------------------------

commit 1d489151 upstream.

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: NNathan Chancellor <natechancellor@gmail.com>
Reviewed-by: NNathan Chancellor <natechancellor@gmail.com>
Reviewed-by: NMiroslav Benes <mbenes@suse.cz>
Tested-by: NNathan Chancellor <natechancellor@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1254Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ntangbin <tangbin_yewu@cmss.chinamobile.com>

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;