From: Ira Weiny <ira.weiny@intel.com>
Date: Fri, 26 Feb 2021 01:22:22 +0000 (-0800)
Subject: fs/coredump: use kmap_local_page()
X-Git-Tag: accepted/tizen/unified/20230118.172025~7728^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3159ed57792be7453793bda27297a423e1c63d6c;p=platform%2Fkernel%2Flinux-rpi.git

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
--- 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);