linux-kernel - Re: [PATCH] efi/tpm: fix section mismatch warning

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Date:   Wed, 29 Apr 2020 21:15:21 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Dave Young <dyoung@...hat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Lukas Wunner <lukas@...ner.de>, Lyude Paul <lyude@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Octavian Purdila <octavian.purdila@...el.com>,
        Peter Jones <pjones@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Scott Talbert <swt@...hie.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-integrity@...r.kernel.org, stable@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] efi/tpm: fix section mismatch warning

On Wed, 29 Apr 2020 at 21:02, Arnd Bergmann <arnd@...db.de> wrote:
>
> Building with gcc-10 causes a harmless warning about a section mismatch:
>
> WARNING: modpost: vmlinux.o(.text.unlikely+0x5e191): Section mismatch in reference from the function tpm2_calc_event_log_size() to the function .init.text:early_memunmap()
> The function tpm2_calc_event_log_size() references
> the function __init early_memunmap().
> This is often because tpm2_calc_event_log_size lacks a __init
> annotation or the annotation of early_memunmap is wrong.
>
> Add the missing annotation.
>
> Fixes: e658c82be556 ("efi/tpm: Only set 'efi_tpm_final_log_size' after successful event log parsing")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, I'll take it as a fix.

> ---
>  drivers/firmware/efi/tpm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
> index 31f9f0e369b9..55b031d2c989 100644
> --- a/drivers/firmware/efi/tpm.c
> +++ b/drivers/firmware/efi/tpm.c
> @@ -16,7 +16,7 @@
>  int efi_tpm_final_log_size;
>  EXPORT_SYMBOL(efi_tpm_final_log_size);
>
> -static int tpm2_calc_event_log_size(void *data, int count, void *size_info)
> +static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
>  {
>         struct tcg_pcr_event2_head *header;
>         int event_size, size = 0;
> --
> 2.26.0
>