From: ira.weiny@intel.com
To: Andrew Morton <akpm@linux-foundation.org>,
David Sterba <dsterba@suse.cz>
Cc: Ira Weiny <ira.weiny@intel.com>,
Christoph Hellwig <hch@infradead.org>,
clm@fb.com, josef@toxicpanda.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: [PATCH V2 3/8] mm/highmem: Introduce memcpy_page(), memmove_page(), and memset_page()
Date: Tue, 9 Feb 2021 22:22:16 -0800 [thread overview]
Message-ID: <20210210062221.3023586-4-ira.weiny@intel.com> (raw)
In-Reply-To: <20210210062221.3023586-1-ira.weiny@intel.com>
From: Ira Weiny <ira.weiny@intel.com>
3 more common kmap patterns are kmap/memcpy/kunmap, kmap/memmove/kunmap.
and kmap/memset/kunmap.
Add helper functions for those patterns which use kmap_local_page().
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
New for V2
---
include/linux/highmem.h | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index c17a175fe5fe..0b5d89621cb9 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -276,6 +276,39 @@ static inline void copy_highpage(struct page *to, struct page *from)
#endif
+static inline void memcpy_page(struct page *dst_page, size_t dst_off,
+ struct page *src_page, size_t src_off,
+ size_t len)
+{
+ char *dst = kmap_local_page(dst_page);
+ char *src = kmap_local_page(src_page);
+
+ memcpy(dst + dst_off, src + src_off, len);
+ kunmap_local(src);
+ kunmap_local(dst);
+}
+
+static inline void memmove_page(struct page *dst_page, size_t dst_off,
+ struct page *src_page, size_t src_off,
+ size_t len)
+{
+ char *dst = kmap_local_page(dst_page);
+ char *src = kmap_local_page(src_page);
+
+ memmove(dst + dst_off, src + src_off, len);
+ kunmap_local(src);
+ kunmap_local(dst);
+}
+
+static inline void memset_page(struct page *page, size_t offset, int val,
+ size_t len)
+{
+ char *addr = kmap_local_page(page);
+
+ memset(addr + offset, val, len);
+ kunmap_local(addr);
+}
+
static inline void memcpy_from_page(char *to, struct page *page,
size_t offset, size_t len)
{
--
2.28.0.rc0.12.gb6a658bd00c9
next prev parent reply other threads:[~2021-02-10 6:24 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 6:22 [PATCH V2 0/8] btrfs: convert kmaps to core page calls ira.weiny
2021-02-10 6:22 ` [PATCH V2 1/8] mm/highmem: Lift memcpy_[to|from]_page to core ira.weiny
2021-02-10 6:33 ` Chaitanya Kulkarni
2021-02-10 12:53 ` Christoph Hellwig
2021-02-10 6:22 ` [PATCH V2 2/8] mm/highmem: Convert memcpy_[to|from]_page() to kmap_local_page() ira.weiny
2021-02-10 6:37 ` Chaitanya Kulkarni
2021-02-10 12:54 ` Christoph Hellwig
2021-02-10 6:22 ` ira.weiny [this message]
2021-02-10 6:46 ` [PATCH V2 3/8] mm/highmem: Introduce memcpy_page(), memmove_page(), and memset_page() Chaitanya Kulkarni
2021-02-10 12:54 ` Christoph Hellwig
2021-02-10 6:22 ` [PATCH V2 4/8] mm/highmem: Add VM_BUG_ON() to mem*_page() calls ira.weiny
2021-02-10 6:57 ` Chaitanya Kulkarni
2021-02-10 16:31 ` Ira Weiny
2021-02-10 12:55 ` Christoph Hellwig
2021-02-10 16:29 ` Ira Weiny
2021-02-10 16:41 ` Christoph Hellwig
2021-02-10 17:04 ` Ira Weiny
2021-02-10 18:56 ` Matthew Wilcox
2021-02-10 21:22 ` Ira Weiny
2021-02-11 18:52 ` David Sterba
2021-02-10 17:49 ` [PATCH V2.1] " ira.weiny
2021-02-10 6:22 ` [PATCH V2 5/8] iov_iter: Remove memzero_page() in favor of zero_user() ira.weiny
2021-02-10 12:55 ` Christoph Hellwig
2021-02-10 6:22 ` [PATCH V2 6/8] btrfs: use memcpy_[to|from]_page() and kmap_local_page() ira.weiny
2021-02-10 12:56 ` Christoph Hellwig
2021-02-10 6:22 ` [PATCH V2 7/8] btrfs: use copy_highpage() instead of 2 kmaps() ira.weiny
2021-02-10 12:56 ` Christoph Hellwig
2021-02-10 6:22 ` [PATCH V2 8/8] btrfs: convert to zero_user() ira.weiny
2021-02-10 12:57 ` Christoph Hellwig
2021-02-11 19:38 ` [PATCH V2 0/8] btrfs: convert kmaps to core page calls David Sterba
2021-02-11 21:32 ` Ira Weiny
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