linux-kernel - Re: [PATCH] reiserfs: avoid objtool warning after panic

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Message-Id: <9355f758-9d06-4de8-85f7-e6ad870e784b@app.fastmail.com>
Date:   Fri, 16 Dec 2022 09:00:16 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "kernel test robot" <lkp@...el.com>,
        "Arnd Bergmann" <arnd@...nel.org>, reiserfs-devel@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] reiserfs: avoid objtool warning after panic

On Thu, Dec 15, 2022, at 23:31, kernel test robot wrote:
> Hi Arnd,
>
> I love your patch! Perhaps something to improve:
>
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> reproduce (this is a W=1 build):
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
>>> fs/reiserfs/namei.o: warning: objtool: reiserfs_rename+0x212: unreachable instruction
> --
>>> fs/reiserfs/ibalance.o: warning: objtool: balance_internal_when_delete+0x44c: unreachable instruction
> --
>>> fs/reiserfs/stree.o: warning: objtool: reiserfs_cut_from_item+0x17a: unreachable instruction
> --
>>> fs/reiserfs/journal.o: warning: objtool: do_journal_end+0x4af: unreachable instruction
> --
>>> fs/reiserfs/item_ops.o: warning: objtool: direntry_check_left+0x65: unreachable instruction

Ok, I'll have to revisit this one. I think I tried something similar
before and ran into the same problem but I though I had figured
it out this time.

The problem apparently is that the patch to shut up the objtool
warning with clang in turn adds a different objtool warning with
gcc...

    Arnd