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net: Declare MSG_SPLICE_PAGES internal sendmsg() flag
[ Upstream commit b841b90 ] Declare MSG_SPLICE_PAGES, an internal sendmsg() flag, that hints to a network protocol that it should splice pages from the source iterator rather than copying the data if it can. This flag is added to a list that is cleared by sendmsg syscalls on entry. This is intended as a replacement for the ->sendpage() op, allowing a way to splice in several multipage folios in one go. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Willem de Bruijn <willemb@google.com> cc: Jens Axboe <axboe@kernel.dk> cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Stable-dep-of: a000212 ("udp: move udp->no_check6_tx to udp->udp_flags") Signed-off-by: Sasha Levin <sashal@kernel.org>
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