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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pFScy-003nxk-AX; Wed, 11 Jan 2023 04:22:16 +0000 From: "Matthew Wilcox (Oracle)" To: Jesper Dangaard Brouer , Ilias Apalodimas Cc: "Matthew Wilcox (Oracle)" , netdev@vger.kernel.org, linux-mm@kvack.org, Shakeel Butt , Jesper Dangaard Brouer , Jesse Brandeburg Subject: [PATCH v3 02/26] netmem: Add utility functions Date: Wed, 11 Jan 2023 04:21:50 +0000 Message-Id: <20230111042214.907030-3-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230111042214.907030-1-willy@infradead.org> References: <20230111042214.907030-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: B2FEFC0005 X-Stat-Signature: o96dddcey64dyrrkjwkp5wgqdkb3974s X-HE-Tag: 1673410959-33692 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: netmem_page() is defined this way to preserve constness. page_netmem() doesn't call compound_head() because netmem users always use the head page; it does include a debugging assert to check that it's true. Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Jesper Dangaard Brouer Reviewed-by: Jesse Brandeburg --- include/net/page_pool.h | 59 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/include/net/page_pool.h b/include/net/page_pool.h index cbea4df54918..414907e67ff6 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -96,6 +96,65 @@ NETMEM_MATCH(_refcount, _refcount); #undef NETMEM_MATCH static_assert(sizeof(struct netmem) <= sizeof(struct page)); +#define netmem_page(nmem) (_Generic((nmem), \ + const struct netmem *: (const struct page *)nmem, \ + struct netmem *: (struct page *)nmem)) + +static inline struct netmem *page_netmem(struct page *page) +{ + VM_BUG_ON_PAGE(PageTail(page), page); + return (struct netmem *)page; +} + +static inline unsigned long netmem_pfn(const struct netmem *nmem) +{ + return page_to_pfn(netmem_page(nmem)); +} + +static inline unsigned long netmem_nid(const struct netmem *nmem) +{ + return page_to_nid(netmem_page(nmem)); +} + +static inline struct netmem *virt_to_netmem(const void *x) +{ + return page_netmem(virt_to_head_page(x)); +} + +static inline void *netmem_to_virt(const struct netmem *nmem) +{ + return page_to_virt(netmem_page(nmem)); +} + +static inline void *netmem_address(const struct netmem *nmem) +{ + return page_address(netmem_page(nmem)); +} + +static inline int netmem_ref_count(const struct netmem *nmem) +{ + return page_ref_count(netmem_page(nmem)); +} + +static inline void netmem_get(struct netmem *nmem) +{ + struct folio *folio = (struct folio *)nmem; + + folio_get(folio); +} + +static inline void netmem_put(struct netmem *nmem) +{ + struct folio *folio = (struct folio *)nmem; + + folio_put(folio); +} + +static inline bool netmem_is_pfmemalloc(const struct netmem *nmem) +{ + return nmem->pp_magic & BIT(1); +} + /* * Fast allocation side cache array/stack * -- 2.35.1