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Message-ID: <66e0d14a-bc95-72d6-b1a7-0337a9540579@suse.de>
Date: Mon, 19 Dec 2022 17:15:00 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Siddh Raman Pant <code@...dh.me>
Cc: maarten lankhorst <maarten.lankhorst@...ux.intel.com>,
maxime ripard <mripard@...nel.org>,
david airlie <airlied@...il.com>,
daniel vetter <daniel@...ll.ch>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm: Replace DRM_INFO() with pr_info()
Hi
Am 19.12.22 um 16:34 schrieb Siddh Raman Pant:
> On Mon, 19 Dec 2022 20:27:45 +0530, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 19.12.22 um 15:23 schrieb Siddh Raman Pant:
>>> Line 536 of drm_print.h says DRM_INFO() is deprecated
>>> in favor of pr_info().
>>
>> That's a misleading comment. DRM_INFO() is deprecated for drm_info().
>> pr_info() et al is only to be used of you don't have a dev pointer.
>>
>> Best regards
>> Thomas
>
> Maybe you are confusing it with DRM_DEV_INFO? It takes the dev pointer,
> and is indeed told to be deprecated in favour of drm_info() in the
> comments (see line 394).
>
> DRM_INFO is a separate macro for printing stuff, and does not take the
> dev pointer. They seem to be early wrappers for printk, I guess when
> pr_info did not exist. And all they do different from pr_info is to add
> DRM_NAME (which seems to be just "drm") in front of the string.
The DRM_ print macros in capital letters are deprecated AFAIK. In cases
where a dev pointer is available, using drm_info() et al. is preferred
over pr_info().
In the context of your patch, you should use drm_info() in
drm_client_target_cloned(), as is gets a dev pointer as its first
argument. In most the other cases from your patch, you can get the dev
pointer from connector->dev.
The final case, drm_legacy_pci_exit(), there's no dev pointer, so you
can use pr_info() there. I'd remove '[drm]' from the string. We don't
use this much elsewhere.
Best regards
Thomas
>
> Thanks,
> Siddh
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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