From 1d625960e41907af706f573a3cd097595a0ade63 Mon Sep 17 00:00:00 2001 From: "Fabio M. De Francesco" Date: Mon, 25 Apr 2022 19:57:53 +0200 Subject: binder: Use kmap_local_page() in binder_alloc_copy_user_to_buffer() The use of kmap() is being deprecated in favor of kmap_local_page() where it is feasible. With kmap_local_page(), the mapping is per thread, CPU local and not globally visible. binder_alloc_copy_user_to_buffer() is a function where the use of kmap_local_page() in place of kmap() is correctly suited because the mapping is local to the thread. Therefore, use kmap_local_page() / kunmap_local(). Cc: Christophe JAILLET Acked-by: Todd Kjos Signed-off-by: Fabio M. De Francesco Link: https://lore.kernel.org/r/20220425175754.8180-3-fmdefrancesco@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c index 0b3f2f569053..0875c463c002 100644 --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -1217,9 +1217,9 @@ binder_alloc_copy_user_to_buffer(struct binder_alloc *alloc, page = binder_alloc_get_page(alloc, buffer, buffer_offset, &pgoff); size = min_t(size_t, bytes, PAGE_SIZE - pgoff); - kptr = kmap(page) + pgoff; + kptr = kmap_local_page(page) + pgoff; ret = copy_from_user(kptr, from, size); - kunmap(page); + kunmap_local(kptr); if (ret) return bytes - size + ret; bytes -= size; -- cgit v1.2.3