[merged] highmem-document-kunmap_local.patch removed from -mm tree

[merged] highmem-document-kunmap_local.patch removed from -mm tree

[Andrew Morton]

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@intel.com>
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@iweiny-DESK2.sc.intel.com/

[ira.weiny@intel.com: updates per Christoph]
  Link: https://lkml.kernel.org/r/20220124182138.816693-1-ira.weiny@intel.com
Link: https://lkml.kernel.org/r/20220124013045.806718-1-ira.weiny@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@intel.com are