[RESEND,v3,net-next,0/5] net: consolidate page_is_pfmemalloc() usage

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-alobakin@pm.me
[1] https://lore.kernel.org/netdev/20210127201031.98544-1-alobakin@pm.me
[2] https://lore.kernel.org/lkml/20210131120844.7529-1-alobakin@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(-)

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Tue, 02 Feb 2021 13:30:43 +0000 you 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.

> 

> [...]


Here is the summary with links:
  - [RESEND,v3,net-next,1/5] mm: constify page_is_pfmemalloc() argument
    https://git.kernel.org/netdev/net-next/c/1d7bab6a9445
  - [RESEND,v3,net-next,2/5] skbuff: constify skb_propagate_pfmemalloc() "page" argument
    https://git.kernel.org/netdev/net-next/c/48f971c9c80a
  - [RESEND,v3,net-next,3/5] net: introduce common dev_page_is_reusable()
    https://git.kernel.org/netdev/net-next/c/bc38f30f8dbc
  - [RESEND,v3,net-next,4/5] net: use the new dev_page_is_reusable() instead of private versions
    https://git.kernel.org/netdev/net-next/c/a79afa78e625
  - [RESEND,v3,net-next,5/5] net: page_pool: simplify page recycling condition tests
    https://git.kernel.org/netdev/net-next/c/05656132a874

You are awesome, thank you!
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