From 89ade7c7306508f46b811cd43960eaed88e0e1dd Mon Sep 17 00:00:00 2001 From: Byungchul Park Date: Mon, 21 Jul 2025 11:18:26 +0900 Subject: netmem, mlx4: access ->pp_ref_count through netmem_desc instead of page To eliminate the use of struct page in page pool, the page pool users should use netmem descriptor and APIs instead. Make mlx4 access ->pp_ref_count through netmem_desc instead of page. While at it, add a helper, pp_page_to_nmdesc() and __pp_page_to_nmdesc(), that can be used to get netmem_desc from page only if it's a pp page. For now that netmem_desc overlays on page, it can be achieved by just casting, and use macro and _Generic to cover const casting as well. Plus, change page_pool_page_is_pp() to check for 'const struct page *' instead of 'struct page *' since it doesn't modify data and additionally covers const type. Signed-off-by: Byungchul Park Link: https://patch.msgid.link/20250721021835.63939-4-byungchul@sk.com Signed-off-by: Jakub Kicinski --- include/linux/mm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/mm.h b/include/linux/mm.h index fa538feaa8d9..ae50c1641bed 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4178,12 +4178,12 @@ int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status); #define PP_MAGIC_MASK ~(PP_DMA_INDEX_MASK | 0x3UL) #ifdef CONFIG_PAGE_POOL -static inline bool page_pool_page_is_pp(struct page *page) +static inline bool page_pool_page_is_pp(const struct page *page) { return (page->pp_magic & PP_MAGIC_MASK) == PP_SIGNATURE; } #else -static inline bool page_pool_page_is_pp(struct page *page) +static inline bool page_pool_page_is_pp(const struct page *page) { return false; } -- cgit v1.2.3