From: Ira Weiny <redacted>
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@intel.com
Signed-off-by: Ira Weiny <redacted>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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

@@ -897,10 +897,10 @@ 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);

_