linux/sound/hda/Kconfig
Takashi Iwai f8e4ae10de ALSA: hda: Allow setting preallocation again for x86
The commit c31427d0d2 ("ALSA: hda: No preallocation on x86
platforms") changed CONFIG_SND_HDA_PREALLOC_SIZE setup and its default
to zero for x86, as the preallocation should work almost all cases.
However, this expectation was too naive; some applications try to
allocate as the max buffer size as possible, and it leads to the
memory exhaustion.  More badly, the commit changed the kconfig no
longer adjustable for x86, so you can't fix it statically (although it
can be still adjusted via procfs).

So, practically seen, it's more recommended to set a reasonable limit
for x86, too.  This patch follows to that experience, and changes the
default to 2048 and allow the kconfig adjustable again.

Fixes: c31427d0d2 ("ALSA: hda: No preallocation on x86 platforms")
Cc: <stable@vger.kernel.org>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207223
Link: https://lore.kernel.org/r/20200413201919.24241-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-04-13 22:22:28 +02:00

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# SPDX-License-Identifier: GPL-2.0-only
config SND_HDA_CORE
tristate
select REGMAP
config SND_HDA_DSP_LOADER
bool
config SND_HDA_ALIGNED_MMIO
bool
config SND_HDA_COMPONENT
bool
config SND_HDA_I915
bool
select SND_HDA_COMPONENT
config SND_HDA_EXT_CORE
tristate
select SND_HDA_CORE
config SND_HDA_PREALLOC_SIZE
int "Pre-allocated buffer size for HD-audio driver"
range 0 32768
default 2048 if SND_DMA_SGBUF
default 64 if !SND_DMA_SGBUF
help
Specifies the default pre-allocated buffer-size in kB for the
HD-audio driver. A larger buffer (e.g. 2048) is preferred
for systems using PulseAudio. The default 64 is chosen just
for compatibility reasons.
On x86 systems, the default is 2048 as a reasonable value for
most of modern systems.
Note that the pre-allocation size can be changed dynamically
via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too.
config SND_INTEL_NHLT
bool
# this config should be selected only for Intel ACPI platforms.
# A fallback is provided so that the code compiles in all cases.
config SND_INTEL_DSP_CONFIG
tristate
select SND_INTEL_NHLT if ACPI
# this config should be selected only for Intel DSP platforms.
# A fallback is provided so that the code compiles in all cases.