提交 5aa82478 编写于 作者: J Josh Poimboeuf 提交者: Zheng Zengkai

objtool: Don't fail on missing symbol table

stable inclusion
from stable-5.10.12
commit c6fd968f58439398b765300aecd7758d501ee49c
bugzilla: 47876

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

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: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
上级 805fa5dc
......@@ -354,8 +354,11 @@ 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");
......
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