linux-kernel - Re: [PATCH] [PATCH v2] ARM: fix unmet dependency on BITREVERSE for HAVE_ARCH

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Message-ID: <CAK8P3a3=LBTM=ZnoPyhGRRstdBy1iTMHEeV4C4+NDU8B_sbTEQ@mail.gmail.com>
Date:   Tue, 9 Nov 2021 08:57:27 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Julian Braha <julianbraha@...il.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        fazilyildiran@...il.com
Subject: Re: [PATCH] [PATCH v2] ARM: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE

On Tue, Nov 9, 2021 at 7:03 AM Julian Braha <julianbraha@...il.com> wrote:
>
> When ARM is enabled, and BITREVERSE is disabled,
> Kbuild gives the following warning:
>
> WARNING: unmet direct dependencies detected for HAVE_ARCH_BITREVERSE
>   Depends on [n]: BITREVERSE [=n]
>   Selected by [y]:
>   - ARM [=y] && (CPU_32v7M [=n] || CPU_32v7 [=y]) && !CPU_32v6 [=n]
>
> This is because ARM selects HAVE_ARCH_BITREVERSE
> without selecting BITREVERSE, despite
> HAVE_ARCH_BITREVERSE depending on BITREVERSE.
>
> This unmet dependency bug was found by Kismet,
> a static analysis tool for Kconfig.

Looks good to me, please add it to the patch tracker[1].

Reviewed-by: Arnd Bergmann <arnd@...db.de>

> Please advise if this
> is not the appropriate solution.
>
> v2:
> Changed this fix to remove the dependency on BITREVERSE from
> HAVE_ARCH_BITREVERSE, since it isn't actually necessary.

This bit should go below the --- line. You can also add a Link: tag
pointing to v1 [2].

       Arnd

[1] https://www.armlinux.org.uk/developer/patches/info.php
[2] https://lore.kernel.org/linux-arm-kernel/20211029203110.8343-1-julianbraha@gmail.com/