linux-kernel - Re: [asahilinux:asahi-soc/rtkit-sart-nvme 4/6] drivers/soc/apple/sart.c:284:4: warning: format specifies type 'unsigned long long' but the argument has type 'phys_addr

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Date:   Mon, 2 May 2022 09:47:04 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Arnd Bergmann <arnd@...db.de>, kernel test robot <lkp@...el.com>,
        clang-built-linux <llvm@...ts.linux.dev>,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hector Martin <marcan@...can.st>
Subject: Re: [asahilinux:asahi-soc/rtkit-sart-nvme 4/6] drivers/soc/apple/sart.c:284:4:
 warning: format specifies type 'unsigned long long' but the argument has type
 'phys_addr_t' (aka 'unsigned int')

On Mon, May 2, 2022 at 9:34 AM Sven Peter <sven@...npeter.dev> wrote:
> On Mon, May 2, 2022, at 08:39, Arnd Bergmann wrote:
> >
> > to print a phys_addr_t, you should pass the address by reference and use
> > the special "%pap" format string modifier. I'm not entirely sure if it should
> > actually be a dma_addr_t instead of a phys_addr_t. If the type gets changed,
> > the format string would become "%pad".
>
> I've been using %pa for all other prints in this file since v1 and just
> missed this one for some reason. I'm a bit confused why the bots found this last
> one only now but I'll fix it as well.

You only get a warning for 32-bit builds using 64-bit phys_addr_t,
which is fairly
rare, so you can't predict whether the bots will actually run into this.

       Arnd