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-rw-r--r--Documentation/sound/alsa-configuration.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index ab5761148163..4d83c1c0ca04 100644
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -2224,6 +2224,13 @@ quirk_alias
Quirk alias list, pass strings like ``0123abcd:5678beef``, which
applies the existing quirk for the device 5678:beef to a new
device 0123:abcd.
+use_vmalloc
+ Use vmalloc() for allocations of the PCM buffers (default: yes).
+ For architectures with non-coherent memory like ARM or MIPS, the
+ mmap access may give inconsistent results with vmalloc'ed
+ buffers. If mmap is used on such architectures, turn off this
+ option, so that the DMA-coherent buffers are allocated and used
+ instead.
This module supports multiple devices, autoprobe and hotplugging.