linux-kernel - Re: [PATCH 00/17] Add memberof(), split some headers, and slightly simplify code

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Message-ID: <f1a90f53-060e-2960-3926-e30b44a1be28@gmail.com>
Date:   Fri, 19 Nov 2021 16:38:46 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Borislav Petkov <bp@...e.de>,
        Corey Minyard <cminyard@...sta.com>, Chris Mason <clm@...com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        David Sterba <dsterba@...e.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jason Wang <jasowang@...hat.com>,
        Jitendra Bhivare <jitendra.bhivare@...adcom.com>,
        John Hubbard <jhubbard@...dia.com>,
        "John S . Gruber" <JohnSGruber@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Josef Bacik <josef@...icpanda.com>,
        Kees Cook <keescook@...omium.org>,
        Ketan Mukadam <ketan.mukadam@...adcom.com>,
        Len Brown <lenb@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Subbu Seetharaman <subbu.seetharaman@...adcom.com>,
        intel-gfx@...ts.freedesktop.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-btrfs@...r.kernel.org,
        linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 00/17] Add memberof(), split some headers, and slightly
 simplify code

Hi Andy,

On 11/19/21 16:34, Andy Shevchenko wrote:
> On Fri, Nov 19, 2021 at 04:06:27PM +0100, Alejandro Colomar (man-pages) wrote:
>> Yes, I would like to untangle the dependencies.
>>
>> The main reason I started doing this splitting
>> is because I wouldn't be able to include
>> <linux/stddef.h> in some headers,
>> because it pulled too much stuff that broke unrelated things.
>>
>> So that's why I started from there.
>>
>> I for example would like to get NULL in memberof()
>> without puling anything else,
>> so <linux/NULL.h> makes sense for that.
> 
> I don't believe that the code that uses NULL won't include types.h.

I'm not sure about the error I got (I didn't write it down),
but I got a compilation error.
That's why I split NULL.

If one could anwer my doubt,
I would be in better position to learn how to avoid them.
See below.

On 11/19/21 16:06, Alejandro Colomar (man-pages) wrote:
> BTW, I also have a longstanding doubt about
> how header files are organized in the kernel,
> and which headers can and cannot be included
> from which other files.
>
> For example I see that files in samples or scripts or tools,
> that redefine many things such as offsetof() or ARRAY_SIZE(),
> and I don't know if there's a good reason for that,
> or if I should simply remove all that stuff and
> include <linux/offsetof.h> everywhere I see offsetof() being used.

Thanks,
Alex



-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/