linux-kernel - Re: linux-next: build warnings after merge of the tip tree

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Date:   Tue, 15 Mar 2022 13:32:49 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warnings after merge of the tip tree

Hi all,

On Sat, 22 Jan 2022 10:58:06 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> On Fri, 17 Dec 2021 14:40:04 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> > produced these warnings:
> > 
> > lib/strnlen_user.o: warning: objtool: strnlen_user()+0xc9: call to do_strnlen_user() with UACCESS enabled
> > lib/strncpy_from_user.o: warning: objtool: strncpy_from_user()+0x129: call to do_strncpy_from_user() with UACCESS enabled
> > 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.constprop.0() leaves .noinstr.text section
> > vmlinux.o: warning: objtool: mce_read_aux()+0x8a: call to mca_msr_reg() leaves .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
> > 
> > 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.constprop.0() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_read_aux()+0x8a: call to mca_msr_reg() leaves .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
> 
> $ 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

I gained these new ones after merging today's tip tree:

arch/x86/crypto/chacha-x86_64.o: warning: objtool: chacha_2block_xor_avx512vl() falls through to next function chacha_8block_xor_avx512vl()
arch/x86/crypto/chacha-x86_64.o: warning: objtool: chacha_4block_xor_avx512vl() falls through to next function chacha_8block_xor_avx512vl()
arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_blocks_avx() falls through to next function poly1305_blocks_x86_64()
arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_emit_avx() falls through to next function poly1305_emit_x86_64()
arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_blocks_avx2() falls through to next function poly1305_blocks_x86_64()
arch/x86/crypto/poly1305-x86_64.o: warning: objtool: poly1305_blocks_avx512() falls through to next function poly1305_blocks_x86_64()

-- 
Cheers,
Stephen Rothwell

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