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50 lines
1.7 KiB
Diff
50 lines
1.7 KiB
Diff
From 91b6847ca89d9e7e38770f56c13b80c8f9f810b2 Mon Sep 17 00:00:00 2001
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From: Josh Poimboeuf <jpoimboe@redhat.com>
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Date: Thu, 14 Jan 2021 16:14:01 -0600
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Subject: [PATCH 1/4] objtool: Don't fail on missing symbol table
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[ Upstream commit 1d489151e9f9d1647110277ff77282fe4d96d09b ]
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Thanks to a recent binutils change which doesn't generate unused
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symbols, it's now possible for thunk_64.o be completely empty without
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CONFIG_PREEMPTION: no text, no data, no symbols.
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We could edit the Makefile to only build that file when
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CONFIG_PREEMPTION is enabled, but that will likely create confusion
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if/when the thunks end up getting used by some other code again.
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Just ignore it and move on.
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Reported-by: Nathan Chancellor <natechancellor@gmail.com>
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Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
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Reviewed-by: Miroslav Benes <mbenes@suse.cz>
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Tested-by: Nathan Chancellor <natechancellor@gmail.com>
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Link: https://github.com/ClangBuiltLinux/linux/issues/1254
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Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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Signed-off-by: Sasha Levin <sashal@kernel.org>
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---
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tools/objtool/elf.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
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index 26d11d821941..d68d3efabff4 100644
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--- a/tools/objtool/elf.c
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+++ b/tools/objtool/elf.c
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@@ -354,8 +354,11 @@ static int read_symbols(struct elf *elf)
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symtab = find_section_by_name(elf, ".symtab");
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if (!symtab) {
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- WARN("missing symbol table");
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- return -1;
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+ /*
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+ * A missing symbol table is actually possible if it's an empty
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+ * .o file. This can happen for thunk_64.o.
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+ */
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+ return 0;
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}
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symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
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--
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2.35.3
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