From: Jesper Dangaard Brouer <brouer@redhat.com>
To: netdev@vger.kernel.org, linux-mm@kvack.org
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
willy@infradead.org, "Saeed Mahameed" <saeedm@mellanox.com>,
"Alexander Duyck" <alexander.duyck@gmail.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
mgorman@techsingularity.net,
"David S. Miller" <davem@davemloft.net>,
"Tariq Toukan" <tariqt@mellanox.com>
Subject: [net-next PATCH V3 1/3] mm: add dma_addr_t to struct page
Date: Wed, 13 Feb 2019 02:55:40 +0100 [thread overview]
Message-ID: <155002294008.5597.13759027075590385810.stgit@firesoul> (raw)
In-Reply-To: <155002290134.5597.6544755780651689517.stgit@firesoul>
The page_pool API is using page->private to store DMA addresses.
As pointed out by David Miller we can't use that on 32-bit architectures
with 64-bit DMA
This patch adds a new dma_addr_t struct to allow storing DMA addresses
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/mm_types.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 2c471a2c43fa..0a36a22228e7 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -95,6 +95,13 @@ struct page {
*/
unsigned long private;
};
+ struct { /* page_pool used by netstack */
+ /**
+ * @dma_addr: might require a 64-bit value even on
+ * 32-bit architectures.
+ */
+ dma_addr_t dma_addr;
+ };
struct { /* slab, slob and slub */
union {
struct list_head slab_list; /* uses lru */
next prev parent reply other threads:[~2019-02-13 1:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 1:55 [net-next PATCH V3 0/3] Fix page_pool API and dma address storage Jesper Dangaard Brouer
2019-02-13 1:55 ` Jesper Dangaard Brouer [this message]
2020-04-29 0:38 ` [net-next PATCH V3 1/3] mm: add dma_addr_t to struct page Kirill A. Shutemov
2020-04-29 1:54 ` Matthew Wilcox
2019-02-13 1:55 ` [net-next PATCH V3 2/3] net: page_pool: don't use page->private to store dma_addr_t Jesper Dangaard Brouer
2019-02-13 1:55 ` [net-next PATCH V3 3/3] page_pool: use DMA_ATTR_SKIP_CPU_SYNC for DMA mappings Jesper Dangaard Brouer
2019-02-14 6:02 ` [net-next PATCH V3 0/3] Fix page_pool API and dma address storage David Miller
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