[PATCH net-next 0/3] net: constify page_is_pfmemalloc() and its users

[PATCH net-next 0/3] net: constify page_is_pfmemalloc() and its users

[Alexander Lobakin]

page_is_pfmemalloc() is used mostly by networking drivers. It doesn't
write anything to the struct page itself, so constify its argument and
a bunch of callers and wrappers around this function in drivers.
In Page Pool core code, it can be simply inlined instead.

Alexander Lobakin (3):
  mm: constify page_is_pfmemalloc() argument
  net: constify page_is_pfmemalloc() argument at call sites
  net: page_pool: simplify page recycling condition tests

 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   |  2 +-
 drivers/net/ethernet/intel/fm10k/fm10k_main.c     |  2 +-
 drivers/net/ethernet/intel/i40e/i40e_txrx.c       |  2 +-
 drivers/net/ethernet/intel/iavf/iavf_txrx.c       |  2 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c         |  2 +-
 drivers/net/ethernet/intel/igb/igb_main.c         |  2 +-
 drivers/net/ethernet/intel/igc/igc_main.c         |  2 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  2 +-
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   |  2 +-
 include/linux/mm.h                                |  2 +-
 include/linux/skbuff.h                            |  4 ++--
 net/core/page_pool.c                              | 14 ++++----------
 13 files changed, 17 insertions(+), 23 deletions(-)

-- 
2.30.0

[PATCH net-next 1/3] mm: constify page_is_pfmemalloc() argument

[Alexander Lobakin]

The function only tests for page->index, so its argument should be
const.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ecdf8a8cd6ae..078633d43af9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1584,7 +1584,7 @@ struct address_space *page_mapping_file(struct page *page);
  * ALLOC_NO_WATERMARKS and the low watermark was not
  * met implying that the system is under some pressure.
  */
-static inline bool page_is_pfmemalloc(struct page *page)
+static inline bool page_is_pfmemalloc(const struct page *page)
 {
 	/*
 	 * Page index cannot be this large so this must be
-- 
2.30.0

[PATCH net-next 2/3] net: constify page_is_pfmemalloc() argument at call sites

[Alexander Lobakin]

Constify "page" argument for page_is_pfmemalloc() users where applicable.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   | 2 +-
 drivers/net/ethernet/intel/fm10k/fm10k_main.c     | 2 +-
 drivers/net/ethernet/intel/i40e/i40e_txrx.c       | 2 +-
 drivers/net/ethernet/intel/iavf/iavf_txrx.c       | 2 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c         | 2 +-
 drivers/net/ethernet/intel/igb/igb_main.c         | 2 +-
 drivers/net/ethernet/intel/igc/igc_main.c         | 2 +-
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     | 2 +-
 drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 2 +-
 include/linux/skbuff.h                            | 4 ++--
 11 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 512080640cbc..0f8e962b5010 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2800,7 +2800,7 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
 	writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
 }
 
-static bool hns3_page_is_reusable(struct page *page)
+static bool hns3_page_is_reusable(const struct page *page)
 {
 	return page_to_nid(page) == numa_mem_id() &&
 		!page_is_pfmemalloc(page);
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index 99b8252eb969..32fcb7a51b5d 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -194,7 +194,7 @@ static void fm10k_reuse_rx_page(struct fm10k_ring *rx_ring,
 					 DMA_FROM_DEVICE);
 }
 
-static inline bool fm10k_page_is_reserved(struct page *page)
+static inline bool fm10k_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 2574e78f7597..3886cddfd856 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1850,7 +1850,7 @@ static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb,
  * A page is not reusable if it was allocated under low memory
  * conditions, or it's not in the same NUMA node as this CPU.
  */
-static inline bool i40e_page_is_reusable(struct page *page)
+static inline bool i40e_page_is_reusable(const struct page *page)
 {
 	return (page_to_nid(page) == numa_mem_id()) &&
 		!page_is_pfmemalloc(page);
diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index 256fa07d54d5..d9ba8433c911 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -1148,7 +1148,7 @@ static void iavf_reuse_rx_page(struct iavf_ring *rx_ring,
  * A page is not reusable if it was allocated under low memory
  * conditions, or it's not in the same NUMA node as this CPU.
  */
-static inline bool iavf_page_is_reusable(struct page *page)
+static inline bool iavf_page_is_reusable(const struct page *page)
 {
 	return (page_to_nid(page) == numa_mem_id()) &&
 		!page_is_pfmemalloc(page);
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 422f53997c02..ecbf94cb11ea 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -732,7 +732,7 @@ bool ice_alloc_rx_bufs(struct ice_ring *rx_ring, u16 cleaned_count)
  * ice_page_is_reserved - check if reuse is possible
  * @page: page struct to check
  */
-static bool ice_page_is_reserved(struct page *page)
+static bool ice_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 84d4284b8b32..5e1aa7d04bf7 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -8215,7 +8215,7 @@ static void igb_reuse_rx_page(struct igb_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool igb_page_is_reserved(struct page *page)
+static inline bool igb_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 43aec42e6d9d..2939a3a4fa00 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1648,7 +1648,7 @@ static void igc_reuse_rx_page(struct igc_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool igc_page_is_reserved(struct page *page)
+static inline bool igc_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index e08c01525fd2..e2cd995512b1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1940,7 +1940,7 @@ static void ixgbe_reuse_rx_page(struct ixgbe_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool ixgbe_page_is_reserved(struct page *page)
+static inline bool ixgbe_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index a14e55e7fce8..b4fb6bee1bb0 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -781,7 +781,7 @@ static void ixgbevf_reuse_rx_page(struct ixgbevf_ring *rx_ring,
 	new_buff->pagecnt_bias = old_buff->pagecnt_bias;
 }
 
-static inline bool ixgbevf_page_is_reserved(struct page *page)
+static inline bool ixgbevf_page_is_reserved(const struct page *page)
 {
 	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index dec93d57542f..9fff677026b7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -212,7 +212,7 @@ static inline u32 mlx5e_decompress_cqes_start(struct mlx5e_rq *rq,
 	return mlx5e_decompress_cqes_cont(rq, wq, 1, budget_rem) - 1;
 }
 
-static inline bool mlx5e_page_is_reserved(struct page *page)
+static inline bool mlx5e_page_is_reserved(const struct page *page)
 {
 	return page_is_pfmemalloc(page) || page_to_nid(page) != numa_mem_id();
 }
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 9313b5aaf45b..b027526da4f9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2943,8 +2943,8 @@ static inline struct page *dev_alloc_page(void)
  *	@page: The page that was allocated from skb_alloc_page
  *	@skb: The skb that may need pfmemalloc set
  */
-static inline void skb_propagate_pfmemalloc(struct page *page,
-					     struct sk_buff *skb)
+static inline void skb_propagate_pfmemalloc(const struct page *page,
+					    struct sk_buff *skb)
 {
 	if (page_is_pfmemalloc(page))
 		skb->pfmemalloc = true;
-- 
2.30.0

Re: [PATCH net-next 2/3] net: constify page_is_pfmemalloc() argument at call sites

[David Rientjes]

On Mon, 25 Jan 2021, Alexander Lobakin wrote:

> Constify "page" argument for page_is_pfmemalloc() users where applicable.
> 
> Signed-off-by: Alexander Lobakin <alobakin@pm.me>
> ---
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   | 2 +-
>  drivers/net/ethernet/intel/fm10k/fm10k_main.c     | 2 +-
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c       | 2 +-
>  drivers/net/ethernet/intel/iavf/iavf_txrx.c       | 2 +-
>  drivers/net/ethernet/intel/ice/ice_txrx.c         | 2 +-
>  drivers/net/ethernet/intel/igb/igb_main.c         | 2 +-
>  drivers/net/ethernet/intel/igc/igc_main.c         | 2 +-
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     | 2 +-
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 2 +-
>  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 2 +-
>  include/linux/skbuff.h                            | 4 ++--
>  11 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 512080640cbc..0f8e962b5010 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> @@ -2800,7 +2800,7 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
>  	writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
>  }
>  
> -static bool hns3_page_is_reusable(struct page *page)
> +static bool hns3_page_is_reusable(const struct page *page)
>  {
>  	return page_to_nid(page) == numa_mem_id() &&
>  		!page_is_pfmemalloc(page);

Hi Alexander,

All of these functions appear to be doing the same thing, would it make 
sense to simply add this to a header file and remove all the code 
duplication as well?

Re: [PATCH net-next 2/3] net: constify page_is_pfmemalloc() argument at call sites

[Alexander Lobakin]

From: David Rientjes <rientjes@google.com>
Date: Mon, 25 Jan 2021 10:19:48 -0800 (PST)

> On Mon, 25 Jan 2021, Alexander Lobakin wrote:
> 
> > Constify "page" argument for page_is_pfmemalloc() users where applicable.
> >
> > Signed-off-by: Alexander Lobakin <alobakin@pm.me>
> > ---
> >  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   | 2 +-
> >  drivers/net/ethernet/intel/fm10k/fm10k_main.c     | 2 +-
> >  drivers/net/ethernet/intel/i40e/i40e_txrx.c       | 2 +-
> >  drivers/net/ethernet/intel/iavf/iavf_txrx.c       | 2 +-
> >  drivers/net/ethernet/intel/ice/ice_txrx.c         | 2 +-
> >  drivers/net/ethernet/intel/igb/igb_main.c         | 2 +-
> >  drivers/net/ethernet/intel/igc/igc_main.c         | 2 +-
> >  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     | 2 +-
> >  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 2 +-
> >  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   | 2 +-
> >  include/linux/skbuff.h                            | 4 ++--
> >  11 files changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > index 512080640cbc..0f8e962b5010 100644
> > --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> > @@ -2800,7 +2800,7 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
> >  	writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
> >  }
> >
> > -static bool hns3_page_is_reusable(struct page *page)
> > +static bool hns3_page_is_reusable(const struct page *page)
> >  {
> >  	return page_to_nid(page) == numa_mem_id() &&
> >  		!page_is_pfmemalloc(page);
> 
> Hi Alexander,

Hi David!

> All of these functions appear to be doing the same thing, would it make
> sense to simply add this to a header file and remove all the code
> duplication as well?

That's an interesting idea. I'll be glad to do this if drivers'
maintainers agree it's okay for them.

Thanks,
Al

[PATCH net-next 3/3] net: page_pool: simplify page recycling condition tests

[Alexander Lobakin]

pool_page_reusable() is a leftover from pre-NUMA-aware times. For now,
this function is just a redundant wrapper over page_is_pfmemalloc(),
so Inline it into its sole call site.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 net/core/page_pool.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index f3c690b8c8e3..ad8b0707af04 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -350,14 +350,6 @@ static bool page_pool_recycle_in_cache(struct page *page,
 	return true;
 }
 
-/* page is NOT reusable when:
- * 1) allocated when system is under some pressure. (page_is_pfmemalloc)
- */
-static bool pool_page_reusable(struct page_pool *pool, struct page *page)
-{
-	return !page_is_pfmemalloc(page);
-}
-
 /* If the page refcnt == 1, this will try to recycle the page.
  * if PP_FLAG_DMA_SYNC_DEV is set, we'll try to sync the DMA area for
  * the configured size min(dma_sync_size, pool->max_len).
@@ -373,9 +365,11 @@ __page_pool_put_page(struct page_pool *pool, struct page *page,
 	 * regular page allocator APIs.
 	 *
 	 * refcnt == 1 means page_pool owns page, and can recycle it.
+	 *
+	 * page is NOT reusable when allocated when system is under
+	 * some pressure. (page_is_pfmemalloc)
 	 */
-	if (likely(page_ref_count(page) == 1 &&
-		   pool_page_reusable(pool, page))) {
+	if (likely(page_ref_count(page) == 1 && !page_is_pfmemalloc(page))) {
 		/* Read barrier done in page_ref_count / READ_ONCE */
 
 		if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
-- 
2.30.0

Re: [PATCH net-next 3/3] net: page_pool: simplify page recycling condition tests

[Jesper Dangaard Brouer]

On Mon, 25 Jan 2021 16:47:20 +0000
Alexander Lobakin <alobakin@pm.me> wrote:

> pool_page_reusable() is a leftover from pre-NUMA-aware times. For now,
> this function is just a redundant wrapper over page_is_pfmemalloc(),
> so Inline it into its sole call site.
> 
> Signed-off-by: Alexander Lobakin <alobakin@pm.me>
> ---
>  net/core/page_pool.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)

Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>

> 
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index f3c690b8c8e3..ad8b0707af04 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -350,14 +350,6 @@ static bool page_pool_recycle_in_cache(struct page *page,
>  	return true;
>  }
>  
> -/* page is NOT reusable when:
> - * 1) allocated when system is under some pressure. (page_is_pfmemalloc)
> - */
> -static bool pool_page_reusable(struct page_pool *pool, struct page *page)
> -{
> -	return !page_is_pfmemalloc(page);
> -}
> -
>  /* If the page refcnt == 1, this will try to recycle the page.
>   * if PP_FLAG_DMA_SYNC_DEV is set, we'll try to sync the DMA area for
>   * the configured size min(dma_sync_size, pool->max_len).
> @@ -373,9 +365,11 @@ __page_pool_put_page(struct page_pool *pool, struct page *page,
>  	 * regular page allocator APIs.
>  	 *
>  	 * refcnt == 1 means page_pool owns page, and can recycle it.
> +	 *
> +	 * page is NOT reusable when allocated when system is under
> +	 * some pressure. (page_is_pfmemalloc)
>  	 */
> -	if (likely(page_ref_count(page) == 1 &&
> -		   pool_page_reusable(pool, page))) {
> +	if (likely(page_ref_count(page) == 1 && !page_is_pfmemalloc(page))) {
>  		/* Read barrier done in page_ref_count / READ_ONCE */
>  
>  		if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)



-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer

Re: [PATCH net-next 3/3] net: page_pool: simplify page recycling condition tests

[Ilias Apalodimas]

On Mon, Jan 25, 2021 at 04:47:20PM +0000, Alexander Lobakin wrote:
> pool_page_reusable() is a leftover from pre-NUMA-aware times. For now,
> this function is just a redundant wrapper over page_is_pfmemalloc(),
> so Inline it into its sole call site.
> 
> Signed-off-by: Alexander Lobakin <alobakin@pm.me>
> ---
>  net/core/page_pool.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index f3c690b8c8e3..ad8b0707af04 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -350,14 +350,6 @@ static bool page_pool_recycle_in_cache(struct page *page,
>  	return true;
>  }
>  
> -/* page is NOT reusable when:
> - * 1) allocated when system is under some pressure. (page_is_pfmemalloc)
> - */
> -static bool pool_page_reusable(struct page_pool *pool, struct page *page)
> -{
> -	return !page_is_pfmemalloc(page);
> -}
> -
>  /* If the page refcnt == 1, this will try to recycle the page.
>   * if PP_FLAG_DMA_SYNC_DEV is set, we'll try to sync the DMA area for
>   * the configured size min(dma_sync_size, pool->max_len).
> @@ -373,9 +365,11 @@ __page_pool_put_page(struct page_pool *pool, struct page *page,
>  	 * regular page allocator APIs.
>  	 *
>  	 * refcnt == 1 means page_pool owns page, and can recycle it.
> +	 *
> +	 * page is NOT reusable when allocated when system is under
> +	 * some pressure. (page_is_pfmemalloc)
>  	 */
> -	if (likely(page_ref_count(page) == 1 &&
> -		   pool_page_reusable(pool, page))) {
> +	if (likely(page_ref_count(page) == 1 && !page_is_pfmemalloc(page))) {
>  		/* Read barrier done in page_ref_count / READ_ONCE */
>  
>  		if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
> -- 
> 2.30.0
> 
> 

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Re: [PATCH net-next 0/3] net: constify page_is_pfmemalloc() and its users

[Alexander Lobakin]

From: Alexander Lobakin <alobakin@pm.me>
Date: Mon, 25 Jan 2021 16:46:48 +0000

> page_is_pfmemalloc() is used mostly by networking drivers. It doesn't
> write anything to the struct page itself, so constify its argument and
> a bunch of callers and wrappers around this function in drivers.
> In Page Pool core code, it can be simply inlined instead.
> 
> Alexander Lobakin (3):
>   mm: constify page_is_pfmemalloc() argument
>   net: constify page_is_pfmemalloc() argument at call sites
>   net: page_pool: simplify page recycling condition tests

Superseded with v2 [0].

>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c   |  2 +-
>  drivers/net/ethernet/intel/fm10k/fm10k_main.c     |  2 +-
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c       |  2 +-
>  drivers/net/ethernet/intel/iavf/iavf_txrx.c       |  2 +-
>  drivers/net/ethernet/intel/ice/ice_txrx.c         |  2 +-
>  drivers/net/ethernet/intel/igb/igb_main.c         |  2 +-
>  drivers/net/ethernet/intel/igc/igc_main.c         |  2 +-
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c     |  2 +-
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |  2 +-
>  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c   |  2 +-
>  include/linux/mm.h                                |  2 +-
>  include/linux/skbuff.h                            |  4 ++--
>  net/core/page_pool.c                              | 14 ++++----------
>  13 files changed, 17 insertions(+), 23 deletions(-)
> 
> -- 
> 2.30.0

[0] https://lore.kernel.org/netdev/20210127201031.98544-1-alobakin@pm.me

Thanks,
Al