Hi, this is a patchset for the issues we've discussed recently lengthily, the explicit sync of appl_ptr by disabling the control mmap. The first patch achieves it for a driver setting the new INFO flag. The second patch is for a generic ABI extension I wanted to implement for long time. It allows user-space reporting its supporting protocol version, so that the kernel can behave differently. It's especially useful for extending the ABI struct to use the reserved bits. The third patch is the optimization by the second patch; it simply skips the previous workaround when the user-space declares itself being new enough to support the feature. The corresponding alsa-lib patchset will follow in another thread. thanks, Takashi === Takashi Iwai (3): ALSA: pcm: Add the explicit appl_ptr sync support ALSA: pcm: Add an ioctl to specify the supported protocol version ALSA: pcm: Limit the appl_ptr sync workaround only for old user-space include/sound/pcm.h | 1 + include/uapi/sound/asound.h | 4 +++- sound/core/pcm_compat.c | 1 + sound/core/pcm_native.c | 28 ++++++++++++++++++++++++++++ 4 files changed, 33 insertions(+), 1 deletion(-) -- 2.13.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
