linux-kernel - Re: linux-next: build warning after merge of the akpm tree

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Date:   Wed, 09 Dec 2020 15:44:35 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Mathieu Malaterre <malat@...ian.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: linux-next: build warning after merge of the akpm tree

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi Stephen,
>
> On Fri, 4 Dec 2020 21:00:00 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>>
>> Hi all,
>> 
>> After merging the akpm tree, today's linux-next build (powerpc
>> allyesconfig) produced warnings like this:
>> 
>> ld: warning: orphan section `.data..Lubsan_data177' from `arch/powerpc/oprofile/op_model_pa6t.o' being placed in section `.data..Lubsan_data177'
>> 
>> (lots of these latter ones)
>
> 781584 of them today!
>
>> I don't know what produced these, but it is in the akpm-current or
>> akpm trees.
>
> Presumably the result of commit
>
>   186c3e18dba3 ("ubsan: enable for all*config builds")
>
> from the akpm-current tree.
>
> arch/powerpc/kernel/vmlinux.lds.S has:
>
> #ifdef CONFIG_PPC32
>         .data : AT(ADDR(.data) - LOAD_OFFSET) {
>                 DATA_DATA
> #ifdef CONFIG_UBSAN
>                 *(.data..Lubsan_data*)
>                 *(.data..Lubsan_type*)
> #endif
>                 *(.data.rel*)
>                 *(SDATA_MAIN)
>
> added by commit
>
>   beba24ac5913 ("powerpc/32: Add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly")
>
> in 2018, but no equivalent for 64 bit.

They should really be in DATA_DATA or similar shouldn't they?

cheers