linux-kernel - Re: [PATCH 04/10] modpost: remove more symbol patterns from the section check whitelist

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Date:   Mon, 23 Oct 2023 16:28:14 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH 04/10] modpost: remove more symbol patterns from the
 section check whitelist

On Mon, Oct 23, 2023 at 02:06:07AM +0900, Masahiro Yamada wrote:
> These symbol patterns were whitelisted to allow them to reference to
> functions with the old __devinit and __devexit annotations.
> 
> We stopped doing this a long time ago, for example, commit 6f039790510f
> ("Drivers: scsi: remove __dev* attributes.") remove those annotations
> from the scsi drivers.
> 
> Keep *_ops and *_console, otherwise they will really cause section
> mismatch warnings.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/mod/modpost.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 792ba9da0f27..19b138664f75 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -997,13 +997,7 @@ static int secref_whitelist(const char *fromsec, const char *fromsym,
>  	/* symbols in data sections that may refer to any init/exit sections */
>  	if (match(fromsec, PATTERNS(DATA_SECTIONS)) &&
>  	    match(tosec, PATTERNS(ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS)) &&
> -	    match(fromsym, PATTERNS("*_template", // scsi uses *_template a lot
> -				    "*_timer", // arm uses ops structures named _timer a lot
> -				    "*_sht", // scsi also used *_sht to some extent
> -				    "*_ops",
> -				    "*_probe",

It seems like this one might still be needed. I see this when building
certain arm64 configurations with clang.

  WARNING: modpost: vmlinux: section mismatch in reference: qcom_irq_combiner_probe+0x0 (section: .data) -> combiner_probe (section: .init.text)

> -				    "*_probe_one",
> -				    "*_console")))
> +	    match(fromsym, PATTERNS("*_ops", "*_console")))
>  		return 0;
>  
>  	/*
> -- 
> 2.40.1
>