From 3159ed57792be7453793bda27297a423e1c63d6c Mon Sep 17 00:00:00 2001
From: Ira Weiny <ira.weiny@intel.com>
Date: Thu, 25 Feb 2021 17:22:22 -0800
Subject: [PATCH] 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>
---
fs/coredump.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/coredump.c b/fs/coredump.c
index ae778937a1ffe..1c0fdc1aa70b4 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);
--
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