The patch titled
Subject: highmem: document kunmap_local()
has been removed from the -mm tree. Its filename was
highmem-document-kunmap_local.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Ira Weiny <ira.weiny@xxxxxxxxx>
Subject: highmem: document kunmap_local()
Some users of kmap() add an offset to the kmap() address to be used
during the mapping.
When converting to kmap_local_page() the base address does not
need to be stored because any address within the page can be used in
kunmap_local(). However, this was not clear from the documentation and
cause some questions.[1]
Document that any address in the page can be used in kunmap_local() to
clarify this for future users.
[1] https://lore.kernel.org/lkml/20211213154543.GM3538886@xxxxxxxxxxxxxxxxxxxxxxxxx/
[ira.weiny@xxxxxxxxx: updates per Christoph]
Link: https://lkml.kernel.org/r/20220124182138.816693-1-ira.weiny@xxxxxxxxx
Link: https://lkml.kernel.org/r/20220124013045.806718-1-ira.weiny@xxxxxxxxx
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/highmem-internal.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/include/linux/highmem-internal.h~highmem-document-kunmap_local
+++ a/include/linux/highmem-internal.h
@@ -246,6 +246,16 @@ do { \
__kunmap_atomic(__addr); \
} while (0)
+/**
+ * kunmap_local - Unmap a page mapped via kmap_local_page().
+ * @__addr: An address within the page mapped
+ *
+ * @__addr can be any address within the mapped page. Commonly it is the
+ * address return from kmap_local_page(), but it can also include offsets.
+ *
+ * Unmapping should be done in the reverse order of the mapping. See
+ * kmap_local_page() for details.
+ */
#define kunmap_local(__addr) \
do { \
BUILD_BUG_ON(__same_type((__addr), struct page *)); \
_
Patches currently in -mm which might be from ira.weiny@xxxxxxxxx are
