From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Javier Martinez Canillas <javierm@redhat.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>,
Sam Ravnborg <sam@ravnborg.org>,
linux-arch@vger.kernel.org, linux-fbdev@vger.kernel.org,
linux-ia64@vger.kernel.org, loongarch@lists.linux.dev,
arnd@arndb.de, deller@gmx.de, chenhuacai@kernel.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
James.Bottomley@hansenpartnership.com,
linux-m68k@lists.linux-m68k.org, linux-parisc@vger.kernel.org,
vgupta@kernel.org, sparclinux@vger.kernel.org,
kernel@xen0n.name, linux-snps-arc@lists.infradead.org,
davem@davemloft.net, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 4/6] fbdev: Include <linux/io.h> via <asm/fb.h>
Date: Wed, 3 May 2023 10:09:39 +0200 [thread overview]
Message-ID: <CAMuHMdW8Sm7sBu47XQ1xygn6fzq2FzQeiuK0ncMVGHan-_k4Ow@mail.gmail.com> (raw)
In-Reply-To: <87354dyj9i.fsf@minerva.mail-host-address-is-not-set>
On Wed, May 3, 2023 at 9:19 AM Javier Martinez Canillas
<javierm@redhat.com> wrote:
> Thomas Zimmermann <tzimmermann@suse.de> writes:
> > Am 02.05.23 um 21:54 schrieb Sam Ravnborg:
> >> On Tue, May 02, 2023 at 03:02:21PM +0200, Thomas Zimmermann wrote:
>
> [...]
>
> >>> #include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
> >>> #include <video/vga.h>
> >>>
> >>> +#include <asm/fb.h>
> >>
> >> When we have a header like linux/fb.h - it is my understanding that it is
> >> preferred to include that file, and not the asm/fb.h variant.
> >>
> >> This is assuming the linux/fb.h contains the generic stuff, and includes
> >> asm/fb.h for the architecture specific parts.
> >>
> >> So drivers will include linux/fb.h and then they automatically get the
> >> architecture specific parts from asm/fb.h.
> >>
> >> In other words, drivers are not supposed to include asm/fb.h, if
> >> linux.fb.h exists - and linux/fb.h shall include the asm/fb.h.
> >>
> >> If the above holds true, then it is wrong and not needed to add asm/fb.h
> >> as seen above.
> >>
> >>
> >> There are countless examples where the above are not followed,
> >> but to my best understanding the above it the preferred way to do it.
> >
> > Where did youher this? I only know about this in the case of asm/io.h
> > vs. linux/io.h.
> >
>
> I understand that's the case too. I believe even checkpatch.pl complains
> about it? (not that the script always get right, but just as an example).
One more to chime in: in general, drivers should only include <linux/foo.h>.
Including <asm/foo.h> directly is the exception.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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next prev parent reply other threads:[~2023-05-03 8:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-02 13:02 [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h> Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 1/6] fbdev/matrox: Remove trailing whitespaces Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 2/6] ipu-v3: Include <linux/io.h> Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 3/6] fbdev: Include <linux/io.h> in various drivers Thomas Zimmermann
2023-05-02 13:02 ` [PATCH v3 4/6] fbdev: Include <linux/io.h> via <asm/fb.h> Thomas Zimmermann
2023-05-02 19:54 ` Sam Ravnborg
2023-05-03 7:09 ` Thomas Zimmermann
2023-05-03 7:19 ` Javier Martinez Canillas
2023-05-03 8:09 ` Geert Uytterhoeven [this message]
2023-05-03 8:12 ` Thomas Zimmermann
2023-05-03 8:52 ` Arnd Bergmann
2023-05-02 13:02 ` [PATCH v3 5/6] fbdev: Move framebuffer I/O helpers into <asm/fb.h> Thomas Zimmermann
2023-05-02 20:03 ` Sam Ravnborg
2023-05-03 6:58 ` Thomas Zimmermann
2023-05-03 19:03 ` Sam Ravnborg
2023-05-02 20:06 ` Arnd Bergmann
2023-05-03 14:55 ` Thomas Zimmermann
2023-05-03 15:06 ` Arnd Bergmann
2023-05-02 13:02 ` [PATCH v3 6/6] fbdev: Rename fb_mem*() helpers Thomas Zimmermann
2023-05-02 20:08 ` Sam Ravnborg
2023-05-03 8:15 ` Thomas Zimmermann
2023-05-03 19:06 ` Sam Ravnborg
2023-05-03 8:21 ` [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h> Geert Uytterhoeven
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