linux-kernel - Re: [PATCH] powerpc: fix function annotations to avoid section mismatch warnings with gcc-10

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Date:   Wed, 29 Jul 2020 09:49:49 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Vladis Dronov <vdronov@...hat.com>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] powerpc: fix function annotations to avoid section mismatch warnings with gcc-10

On Wed, Jul 29, 2020 at 03:37:41PM +0200, Vladis Dronov wrote:
> Certain warnings are emitted for powerpc code when building with a gcc-10
> toolset:
> 
>     WARNING: modpost: vmlinux.o(.text.unlikely+0x377c): Section mismatch in
>     reference from the function remove_pmd_table() to the function
>     .meminit.text:split_kernel_mapping()
>     The function remove_pmd_table() references
>     the function __meminit split_kernel_mapping().
>     This is often because remove_pmd_table lacks a __meminit
>     annotation or the annotation of split_kernel_mapping is wrong.
> 
> Add the appropriate __init and __meminit annotations to make modpost not
> complain. In all the cases there are just a single callsite from another
> __init or __meminit function:
> 
> __meminit remove_pagetable() -> remove_pud_table() -> remove_pmd_table()
> __init prom_init() -> setup_secure_guest()
> __init xive_spapr_init() -> xive_spapr_disabled()

So what changed?  These functions were inlined with older compilers, but
not anymore?


Segher