On Thu, 2019-08-01 at 19:24 -0300, Leonardo Bras wrote: > As explained in splice.2, SPLICE_F_MOVE became a no-op, and since it > is needed to use page gifting, it made SPLICE_F_GIFT a no-op too. > > I took a look in current code, and found no use of this flag: > When enabled, it sets PIPE_BUF_FLAG_GIFT,which is only checked in > user_page_pipe_buf_steal, which is only used on > user_page_pipe_buf_ops, as a .steal component. > > But, in the whole kernel code, there is no calling of a steal() > function, making me believe this flag is not used anymore. > > Signed-off-by: Leonardo Bras <leonardo@xxxxxxxxxxxxx> > --- > man2/vmsplice.2 | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/man2/vmsplice.2 b/man2/vmsplice.2 > index 17834607b..94fb86142 100644 > --- a/man2/vmsplice.2 > +++ b/man2/vmsplice.2 > @@ -123,6 +123,11 @@ if this flag is not specified, then a subsequent > .B SPLICE_F_MOVE > must copy the pages. > Data must also be properly page aligned, both in memory and length. > +Starting in Linux 2.6.21, it is a no-op, because the > +.B SPLICE_F_MOVE > +also became a no-op on > +.BR splice (2) > +. > .\" FIXME > .\" It looks like the page-alignment requirement went away with > .\" commit bd1a68b59c8e3bce45fb76632c64e1e063c3962d Any feedback on this patch?
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