John Hubbard <jhubbard@xxxxxxxxxx> wrote: > > Renumber FOLL_PIN and FOLL_GET down to bit 0 and 1 respectively so that > > they are coincidentally the same as BIO_PAGE_PINNED and BIO_PAGE_REFFED and > > also so that they can be stored in the bottom two bits of a page pointer > > (something I'm looking at for zerocopy socket fragments). > > (Note that BIO_PAGE_REFFED should probably be got rid of at some point, > > hence why FOLL_PIN is at 0.) > > Also renumber down the other FOLL_* flags to close the gaps. > > Should we also get these sorted into internal-to-mm and public sets? > Because Jason (+Cc) again was about to split them apart into > mm/internal.h [1] and that might make that a little cleaner. My plan was to push this patch by itself through akpm since it's only an optimisation and not necessary to the rest of the patches here. David
