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[5.94.253.60]) by smtp.gmail.com with ESMTPSA id b12sm14577136eds.23.2021.05.11.06.32.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 May 2021 06:32:11 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org, linux-mm@kvack.org Cc: Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Ilias Apalodimas , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, Matthew Wilcox , Eric Dumazet , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni , Sven Auhagen Subject: [PATCH net-next v4 1/4] mm: add a signature in struct page Date: Tue, 11 May 2021 15:31:15 +0200 Message-Id: <20210511133118.15012-2-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210511133118.15012-1-mcroce@linux.microsoft.com> References: <20210511133118.15012-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Matteo Croce This is needed by the page_pool to avoid recycling a page not allocated via page_pool. Signed-off-by: Matteo Croce --- include/linux/mm_types.h | 1 + include/net/page_pool.h | 2 ++ net/core/page_pool.c | 4 ++++ 3 files changed, 7 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 5aacc1c10a45..77c04210e474 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -101,6 +101,7 @@ struct page { * 32-bit architectures. */ unsigned long dma_addr[2]; + unsigned long signature; }; struct { /* slab, slob and slub */ union { diff --git a/include/net/page_pool.h b/include/net/page_pool.h index b4b6de909c93..9814e36becc1 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -63,6 +63,8 @@ */ #define PP_ALLOC_CACHE_SIZE 128 #define PP_ALLOC_CACHE_REFILL 64 +#define PP_SIGNATURE 0x20210303 + struct pp_alloc_cache { u32 count; struct page *cache[PP_ALLOC_CACHE_SIZE]; diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 3c4c4c7a0402..2e5e2b8c3a02 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -221,6 +221,8 @@ static struct page *__page_pool_alloc_page_order(struct page_pool *pool, return NULL; } + page->signature = PP_SIGNATURE; + /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++; trace_page_pool_state_hold(pool, page, pool->pages_state_hold_cnt); @@ -341,6 +343,8 @@ void page_pool_release_page(struct page_pool *pool, struct page *page) DMA_ATTR_SKIP_CPU_SYNC); page_pool_set_dma_addr(page, 0); skip_dma_unmap: + page->signature = 0; + /* This may be the last page returned, releasing the pool, so * it is not safe to reference pool afterwards. */ -- 2.31.1