From: Jakub Kicinski Date: Thu, 29 Sep 2022 01:51:27 +0000 (-0700) Subject: Merge branch 'shrink-struct-ubuf_info' X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=578b054684e6ad46f6089b726c05054fc5e3cd74;p=linux.git Merge branch 'shrink-struct-ubuf_info' Pavel Begunkov says: ==================== shrink struct ubuf_info struct ubuf_info is large but not all fields are needed for all cases. We have limited space in io_uring for it and large ubuf_info prevents some struct embedding, even though we use only a subset of the fields. It's also not very clean trying to use this typeless extra space. Shrink struct ubuf_info to only necessary fields used in generic paths, namely ->callback, ->refcnt and ->flags, which take only 16 bytes. And make MSG_ZEROCOPY and some other users to embed it into a larger struct ubuf_info_msgzc mimicking the former ubuf_info. Note, xen/vhost may also have some cleaning on top by creating new structs containing ubuf_info but with proper types. ==================== Link: https://lore.kernel.org/r/cover.1663892211.git.asml.silence@gmail.com Signed-off-by: Jakub Kicinski --- 578b054684e6ad46f6089b726c05054fc5e3cd74