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 @@ -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); _
