From fe6f7b77796e6ed21c4f53cfaebedfe12316f5e9 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 3 Oct 2021 13:45:48 -0700
Subject: [PATCH] objtool: print out the symbol type when complaining about it
Git-commit: 7fab1c12bde926c5a8c7d5984c551d0854d7e0b3
Patch-mainline: v5.15-rc4
References: stable-5.14.10

commit 7fab1c12bde926c5a8c7d5984c551d0854d7e0b3 upstream.

The objtool warning that the kvm instruction emulation code triggered
wasn't very useful:

    arch/x86/kvm/emulate.o: warning: objtool: __ex_table+0x4: don't know how to handle reloc symbol type: kvm_fastop_exception

in that it helpfully tells you which symbol name it had trouble figuring
out the relocation for, but it doesn't actually say what the unknown
symbol type was that triggered it all.

In this case it was because of missing type information (type 0, aka
STT_NOTYPE), but on the whole it really should just have printed that
out as part of the message.

Because if this warning triggers, that's very much the first thing you
want to know - why did reloc2sec_off() return failure for that symbol?

So rather than just saying you can't handle some type of symbol without
saying what the type _was_, just print out the type number too.

Fixes: 24ff65257375 ("objtool: Teach get_alt_entry() about more relocation types")
Link: https://lore.kernel.org/lkml/CAHk-=wiZwq-0LknKhXN4M+T8jbxn_2i9mcKpO+OaBSSq_Eh7tg@mail.gmail.com/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 tools/objtool/special.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index f58ecc50fb10..f1428e32a505 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -110,8 +110,10 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
 		return -1;
 	}
 	if (!reloc2sec_off(orig_reloc, &alt->orig_sec, &alt->orig_off)) {
-		WARN_FUNC("don't know how to handle reloc symbol type: %s",
-			   sec, offset + entry->orig, orig_reloc->sym->name);
+		WARN_FUNC("don't know how to handle reloc symbol type %d: %s",
+			   sec, offset + entry->orig,
+			   orig_reloc->sym->type,
+			   orig_reloc->sym->name);
 		return -1;
 	}
 
@@ -132,8 +134,10 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
 			return 1;
 
 		if (!reloc2sec_off(new_reloc, &alt->new_sec, &alt->new_off)) {
-			WARN_FUNC("don't know how to handle reloc symbol type: %s",
-				  sec, offset + entry->new, new_reloc->sym->name);
+			WARN_FUNC("don't know how to handle reloc symbol type %d: %s",
+				  sec, offset + entry->new,
+				  new_reloc->sym->type,
+				  new_reloc->sym->name);
 			return -1;
 		}
 
-- 
2.26.2