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Date:   Sat, 22 Jan 2022 10:58:06 +1100
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Peter Zijlstra <peterz@infradead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: build warnings after merge of the tip tree
Message-ID: <20220122105806.3b710900@canb.auug.org.au>
In-Reply-To: <20211217144004.0c00fabc@canb.auug.org.au>
References: <20211217144004.0c00fabc@canb.auug.org.au>
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Hi all,

On Fri, 17 Dec 2021 14:40:04 +1100 Stephen Rothwell <sfr@canb.auug.org.au> =
wrote:
>
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> produced these warnings:
>=20
> lib/strnlen_user.o: warning: objtool: strnlen_user()+0xc9: call to do_str=
nlen_user() with UACCESS enabled
> lib/strncpy_from_user.o: warning: objtool: strncpy_from_user()+0x129: cal=
l to do_strncpy_from_user() with UACCESS enabled
> vmlinux.o: warning: objtool: mce_start()+0x5c: call to __kasan_check_writ=
e() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_gather_info()+0x5f: call to v8086_mode.c=
onstprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_read_aux()+0x8a: call to mca_msr_reg() l=
eaves .noinstr.text section
> vmlinux.o: warning: objtool: do_machine_check()+0x192: call to mce_no_way=
_out() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_severity_amd.constprop.0()+0xca: call to=
 mce_severity_amd_smca() leaves .noinstr.text section
>=20
> I am not sure which changes caused the above.

I currently still get the following warnings from an x86_64
allmodconfig build fo Linus' tree:

vmlinux.o: warning: objtool: mce_start()+0x5c: call to __kasan_check_write(=
) leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_gather_info()+0x5f: call to v8086_mode.con=
stprop.0() leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_read_aux()+0x8a: call to mca_msr_reg() lea=
ves .noinstr.text section
vmlinux.o: warning: objtool: do_machine_check()+0x192: call to mce_no_way_o=
ut() leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_severity_amd.constprop.0()+0xca: call to m=
ce_severity_amd_smca() leaves .noinstr.text section

$ x86_64-linux-gnu-gcc --version
x86_64-linux-gnu-gcc (Debian 11.2.0-9) 11.2.0
$ x86_64-linux-gnu-ld --version
GNU ld (GNU Binutils for Debian) 2.37

--=20
Cheers,
Stephen Rothwell

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