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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pDY4H-00GWmx-D2; Thu, 05 Jan 2023 21:46:33 +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 Subject: [PATCH v2 02/24] netmem: Add utility functions Date: Thu, 5 Jan 2023 21:46:09 +0000 Message-Id: <20230105214631.3939268-3-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230105214631.3939268-1-willy@infradead.org> References: <20230105214631.3939268-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4F7344000B X-Stat-Signature: ap1zf91jpz3f5ojqexjuknqjfd9atd8t X-Rspam-User: X-HE-Tag: 1672955194-401950 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) --- 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..84b4ea8af015 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