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@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/coredump.c b/fs/coredump.c
index ae77893..1c0fdc1 100644 (file)
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -897,10 +897,10 @@ int dump_user_range(struct coredump_params *cprm, unsigned long start,
                 */
                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);