On 20 March 2012 04:32, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > Big differences to other contenders in the field (like ion) is > that this also supports highmem, so we have to split up the cpu > access from the kernel side into a prepare and a kmap step. > > Prepare is allowed to fail and should do everything required so that > the kmap calls can succeed (like swapin/backing storage allocation, > flushing, ...). > > More in-depth explanations will follow in the follow-up documentation > patch. > > Changes in v2: > > - Clear up begin_cpu_access confusion noticed by Sumit Semwal. > - Don't automatically fallback from the _atomic variants to the > non-atomic variants. The _atomic callbacks are not allowed to > sleep, so we want exporters to make this decision explicit. The > function signatures are explicit, so simpler exporters can still > use the same function for both. > - Make the unmap functions optional. Simpler exporters with permanent > mappings don't need to do anything at unmap time. > > Changes in v3: > > - Adjust the WARN_ON checks for the new ->ops functions as suggested > by Rob Clark and Sumit Semwal. > - Rebased on top of latest dma-buf-next git. > > Changes in v4: > > - Fixup a missing - in a return -EINVAL; statement. > > Signed-Off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Thanks; applied to for-next. > --- <snip> BR, ~Sumit. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
