]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
highmem: document kunmap_local()
authorIra Weiny <ira.weiny@intel.com>
Tue, 22 Mar 2022 21:47:58 +0000 (14:47 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 22 Mar 2022 22:57:11 +0000 (15:57 -0700)
commitd7ca25c53e25a9a628aaa19b5a031f115d8c353d
tree1a677c54404423c7427d27fb06c3ddb354872f9e
parentbe4893d92b6b426357978ed955190c0ead23a4b1
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/highmem-internal.h