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Date:   Thu, 26 May 2022 21:47:11 -0700
From:   Josh Poimboeuf <jpoimboe@kernel.org>
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: manual merge of the tip tree with the kbuild tree
Message-ID: <20220527044711.hrqxx5gz3jghydax@treble>
References: <20220523142431.10ff2f77@canb.auug.org.au>
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 <CAK7LNAR5XWPhmTJV42sYiFCDan6DfB8gsOCJOWiqz4MV1cdE4Q@mail.gmail.com>
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On Fri, May 27, 2022 at 11:19:02AM +0900, Masahiro Yamada wrote:
> [1] original behavior in Josh's commit
> 
> $ git checkout 753da4179d08b625d8df72e97724e22749969fd3
> $ make defconfig
> $ make -j8 kernel/
> $ head -n 1   kernel/.fork.o.cmd
> 
> 
> I do not see the "--linked" parameter in the objtool command.
> 
> 
> 
> 
> [2] behavior in linux-next
> 
> 
> $ git checkout next-20220523
> $ make defconfig
> $ make -j8 kernel/
> $ head -n 1   kernel/.fork.o.cmd
> 
> I see the "--linked" parameter in the objtool command.
> 
> kernel/fork.o  is a direct output from GCC,
> not from linker.

Yes, good catch.  That flag should only be used for linked objects like
vmlinux.o or some_module.o.

Objtool only runs on such objects when CONFIG_LTO_CLANG,
CONFIG_X86_KERNEL_IBT, or CONFIG_NOINSTR_VALIDATION (vmlinux.o-only) is
enabled.

-- 
Josh