On Mon, Jul 22, 2019 at 5:54 AM Gao Xiang <gaoxiang25@xxxxxxxxxx> wrote: > > Currently kernel has scattered tagged pointer usages > hacked by hand in plain code, without a unique and > portable functionset to highlight the tagged pointer > itself and wrap these hacked code in order to clean up > all over meaningless magic masks. > > This patch introduces simple generic methods to fold > tags into a pointer integer. Currently it supports > the last n bits of the pointer for tags, which can be > selected by users. > > In addition, it will also be used for the upcoming EROFS > filesystem, which heavily uses tagged pointer pproach > to reduce extra memory allocation. > > Link: https://en.wikipedia.org/wiki/Tagged_pointer Well, it won't do much good for other kernel users in fs/erofs/ ;-) I think now would be a right time to promote this facility to include/linux as you initially proposed. I don't recall you got any objections. No ACKs either, but I think that was the good kind of silence (?) You might want to post the __fdget conversion patch [1] as a bonus patch on top of your series. Thanks, Amir. [1] https://lore.kernel.org/linux-fsdevel/1530543233-65279-2-git-send-email-gaoxiang25@xxxxxxxxxx/
