[v2,net-next,0/4] net: consolidate page_is_pfmemalloc() usage

Message

Alexander Lobakin Jan. 27, 2021, 8:10 p.m. UTC

page_is_pfmemalloc() is used mostly by networking drivers to test
if a page can be considered for reusing/recycling.
It doesn't write anything to the struct page itself, so its sole
argument can be constified, as well as the first argument of
skb_propagate_pfmemalloc().
In Page Pool core code, it can be simply inlined instead.
Most of the callers from NIC drivers were just doppelgangers of
the same condition tests. Derive them into a new common function
do deduplicate the code.

Since v1 [0]:
 - new: reduce code duplication by introducing a new common function
   to test if a page can be reused/recycled (David Rientjes);
 - collect autographs for Page Pool bits (Jesper Dangaard Brouer,
   Ilias Apalodimas).

[0] https://lore.kernel.org/netdev/[e-mail]

Alexander Lobakin (4):
  mm: constify page_is_pfmemalloc() argument
  skbuff: constify skb_propagate_pfmemalloc() "page" argument
  net: introduce common dev_page_is_reserved()
  net: page_pool: simplify page recycling condition tests

 .../net/ethernet/hisilicon/hns3/hns3_enet.c   | 10 ++--------
 drivers/net/ethernet/intel/fm10k/fm10k_main.c |  9 ++-------
 drivers/net/ethernet/intel/i40e/i40e_txrx.c   | 15 +--------------
 drivers/net/ethernet/intel/iavf/iavf_txrx.c   | 15 +--------------
 drivers/net/ethernet/intel/ice/ice_txrx.c     | 11 +----------
 drivers/net/ethernet/intel/igb/igb_main.c     |  7 +------
 drivers/net/ethernet/intel/igc/igc_main.c     |  7 +------
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  7 +------
 .../net/ethernet/intel/ixgbevf/ixgbevf_main.c |  7 +------
 .../net/ethernet/mellanox/mlx5/core/en_rx.c   |  7 +------
 include/linux/mm.h                            |  2 +-
 include/linux/skbuff.h                        | 19 +++++++++++++++++--
 net/core/page_pool.c                          | 14 ++++----------
 13 files changed, 34 insertions(+), 96 deletions(-)

Comments

Jesse Brandeburg Jan. 27, 2021, 9:52 p.m. UTC | #1

Alexander Lobakin wrote:

> page_is_pfmemalloc() is used mostly by networking drivers to test
> if a page can be considered for reusing/recycling.
> It doesn't write anything to the struct page itself, so its sole
> argument can be constified, as well as the first argument of
> skb_propagate_pfmemalloc().
> In Page Pool core code, it can be simply inlined instead.
> Most of the callers from NIC drivers were just doppelgangers of
> the same condition tests. Derive them into a new common function
> do deduplicate the code.

This is a useful cleanup! Thanks.

For the series:
Reviewed-by: Jesse Brandeburg <[e-mail]>