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.
Resend of v3 [2]: - it missed Patchwork and Netdev archives, probably due to server-side issues. Since v2 [1]: - use more intuitive name for the new inline function since there's nothing "reserved" in remote pages (Jakub Kicinski, John Hubbard); - fold likely() inside the helper itself to make driver code a bit fancier (Jakub Kicinski); - split function introduction and using into two separate commits; - collect some more tags (Jesse Brandeburg, David Rientjes). 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/20210125164612.243838-1-aloba...@pm.me [1] https://lore.kernel.org/netdev/20210127201031.98544-1-aloba...@pm.me [2] https://lore.kernel.org/lkml/20210131120844.7529-1-aloba...@pm.me Alexander Lobakin (5): mm: constify page_is_pfmemalloc() argument skbuff: constify skb_propagate_pfmemalloc() "page" argument net: introduce common dev_page_is_reusable() net: use the new dev_page_is_reusable() instead of private versions net: page_pool: simplify page recycling condition tests .../net/ethernet/hisilicon/hns3/hns3_enet.c | 17 ++++++---------- drivers/net/ethernet/intel/fm10k/fm10k_main.c | 13 ++++-------- 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 | 13 ++---------- drivers/net/ethernet/intel/igb/igb_main.c | 9 ++------- drivers/net/ethernet/intel/igc/igc_main.c | 9 ++------- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 9 ++------- .../net/ethernet/intel/ixgbevf/ixgbevf_main.c | 9 ++------- .../net/ethernet/mellanox/mlx5/core/en_rx.c | 7 +------ include/linux/mm.h | 2 +- include/linux/skbuff.h | 20 +++++++++++++++++-- net/core/page_pool.c | 14 ++++--------- 13 files changed, 46 insertions(+), 106 deletions(-) -- 2.30.0
