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ALSA: docs: Drop snd_print*() stuff

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The legacy snd_print*() helpers will be dropped now.  Clean up the
corresponding documentation, too.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20240807133452.9424-54-tiwai@suse.de
This commit is contained in:
Takashi Iwai 2024-08-07 15:34:43 +02:00
parent 7f5485c4d3
commit 9acb51e961
2 changed files with 0 additions and 31 deletions
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6
Documentation/sound/hd-audio/notes.rst
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@ -321,12 +321,6 @@ Kernel Configuration
--------------------
In general, I recommend you to enable the sound debug option,
``CONFIG_SND_DEBUG=y``, no matter whether you are debugging or not.
This enables snd_printd() macro and others, and you'll get additional
kernel messages at probing.
In addition, you can enable ``CONFIG_SND_DEBUG_VERBOSE=y``. But this
will give you far more messages. Thus turn this on only when you are
sure to want it.
Don't forget to turn on the appropriate ``CONFIG_SND_HDA_CODEC_*``
options. Note that each of them corresponds to the codec chip, not

25
Documentation/sound/kernel-api/writing-an-alsa-driver.rst
View File

@ -4030,31 +4030,6 @@ located in the new subdirectory, sound/pci/xyz.
Useful Functions
================
:c:func:`snd_printk()` and friends
----------------------------------
.. note:: This subsection describes a few helper functions for
decorating a bit more on the standard :c:func:`printk()` & co.
However, in general, the use of such helpers is no longer recommended.
If possible, try to stick with the standard functions like
:c:func:`dev_err()` or :c:func:`pr_err()`.
ALSA provides a verbose version of the :c:func:`printk()` function.
If a kernel config ``CONFIG_SND_VERBOSE_PRINTK`` is set, this function
prints the given message together with the file name and the line of the
caller. The ``KERN_XXX`` prefix is processed as well as the original
:c:func:`printk()` does, so it's recommended to add this prefix,
e.g. snd_printk(KERN_ERR "Oh my, sorry, it's extremely bad!\\n");
There are also :c:func:`printk()`'s for debugging.
:c:func:`snd_printd()` can be used for general debugging purposes.
If ``CONFIG_SND_DEBUG`` is set, this function is compiled, and works
just like :c:func:`snd_printk()`. If the ALSA is compiled without
the debugging flag, it's ignored.
:c:func:`snd_printdd()` is compiled in only when
``CONFIG_SND_DEBUG_VERBOSE`` is set.
:c:func:`snd_BUG()`
-------------------