linux-kernel - Re: [PATCH v1 1/2] LoongArch: Add missing headers

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Message-ID: <CAAhV-H4HkA=SZAb-4q5QVdyDB1MsEsmjVO_N8h30MkSXzpzimQ@mail.gmail.com>
Date:   Mon, 18 Sep 2023 16:05:50 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        WANG Xuerui <kernel@...0n.name>
Subject: Re: [PATCH v1 1/2] LoongArch: Add missing headers

Hi, Andy,

On Mon, Sep 18, 2023 at 2:49 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Sat, Sep 16, 2023 at 08:05:52PM +0800, Huacai Chen wrote:
> > On Sat, Sep 16, 2023 at 6:27 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > > On Fri, Sep 15, 2023 at 08:36:24AM +0800, Huacai Chen wrote:
> > > > On Fri, Sep 15, 2023 at 2:53 AM Andy Shevchenko
> > > > <andriy.shevchenko@...ux.intel.com> wrote:
> > > > > On Thu, Sep 14, 2023 at 11:25:22PM +0800, Huacai Chen wrote:
> > >
> > > > > > Thank you for your patch, can this patch solve the problem below?
> > > > > > https://lore.kernel.org/oe-kbuild-all/202309072237.9zxMv4MZ-lkp@intel.com/T/#u
> > > > >
> > > > > Nope, this just adds missing includes.
> > > > > No functional change, so warnings will still be there.
> > > > But I think a patch should solve a problem.
> > >
> > > No, that problem is static analyser concern, not the compiler nor linker.
> > >
> > > > If we don't get a build
> > > > error or warning without this patch, does that mean the 'missing'
> > > > headers are actually included indirectly?
> > >
> > > I might be missing something, but I do not see any build error in the above message.
> > Hmm, then I think I will take the second patch only.
>
> Thanks, but can you shed a light why?
>
> The rule of thumb is to include the headers we are direct users of, we have not
> to imply any other inclusions done by others, unless it's kinda same family of
> headers (like types.h always includes compiler_types.h). Since in your case
> the const.h is included the other two are missing and it's even worse, as I
> understand you rely on the specific headers to be included _before_ using this
> one in the users.
I agree with you more or less, but I doubt there is another rule: no
break, no fix. Please see:

https://lore.kernel.org/loongarch/20221024070105.306280-1-chenhuacai@loongson.cn/T/#t

Obviously static_key is used in page-flags.h and it really causes
build errors once before, but at last I removed the inclusion of
static_key.h to get that series merged.

Huacai

>
>
> --
> With Best Regards,
> Andy Shevchenko
>
>
>