The patch titled
Subject: fs/coredump: use kmap_local_page()
has been added to the -mm tree. Its filename is
fs-coredump-use-kmap_local_page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/fs-coredump-use-kmap_local_page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/fs-coredump-use-kmap_local_page.patch
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------------------------------------------------------
From: Ira Weiny <ira.weiny@xxxxxxxxx>
Subject: fs/coredump: use kmap_local_page()
In dump_user_range() there is no reason for the mapping to be global. Use
kmap_local_page() rather than kmap.
Link: https://lkml.kernel.org/r/20210203223328.558945-1-ira.weiny@xxxxxxxxx
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/coredump.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/coredump.c~fs-coredump-use-kmap_local_page
+++ a/fs/coredump.c
@@ -894,10 +894,10 @@ int dump_user_range(struct coredump_para
*/
page = get_dump_page(addr);
if (page) {
- void *kaddr = kmap(page);
+ void *kaddr = kmap_local_page(page);
stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
- kunmap(page);
+ kunmap_local(kaddr);
put_page(page);
} else {
stop = !dump_skip(cprm, PAGE_SIZE);
_
Patches currently in -mm which might be from ira.weiny@xxxxxxxxx are
fs-coredump-use-kmap_local_page.patch
