linux-kernel - Re: [PATCH] asm-generic: avoid sparse {get,put}

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Message-ID: <3234493.RMHOAZ7QyG@ripper>
Date:   Mon, 26 Jul 2021 17:04:46 +0200
From:   Sven Eckelmann <sven@...fation.org>
To:     Al Viro <viro@...iv.linux.org.uk>, Arnd Bergmann <arnd@...db.de>
Cc:     Arnd Bergmann <arnd@...db.de>, b.a.t.m.a.n@...ts.open-mesh.org,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] asm-generic: avoid sparse {get,put}_unaligned warning

On Monday, 26 July 2021 14:57:31 CEST Arnd Bergmann wrote:
> >
> > > The special attribute force must be used in such statements when the cast
> > > is known to be safe to avoid these warnings.
> 
> I can see why this would warn, but I'm having trouble reproducing the
> warning on linux-next.

I have sparse 0.6.3 on an Debian bullseye amd64 system. Sources are from 
linux-next next-20210723

    make allnoconfig
    cat >> .config << "EOF"
    CONFIG_NET=y
    CONFIG_INET=y
    CONFIG_BATMAN_ADV=y
    CONFIG_BATMAN_ADV_DAT=y
    EOF
    make olddefconfig
    make CHECK="sparse -Wbitwise-pointer" C=1

I should maybe have made this clearer in the last sentence of the first 
paragraph: "This is also true for pointers to variables with this type when
-Wbitwise-pointer is activated."

Kind regards,
	Sven

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