Thread (57 messages) 57 messages, 11 authors, 2022-11-29
STALE1276d REVIEWED: 1 (1M)
Revisions (2)
  1. rfc [diff vs current]
  2. v1 current

[PATCH mm-unstable v1 19/20] habanalabs: remove FOLL_FORCE usage

From: David Hildenbrand <hidden>
Date: 2022-11-16 10:42:27
Also in: dri-devel, linux-alpha, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-media, linux-mips, linux-mm, linux-perf-users, linux-rdma, linux-samsung-soc, linux-security-module, linux-um, lkml, sparclinux
Subsystem: char and misc drivers, the rest · Maintainers: Arnd Bergmann, Greg Kroah-Hartman, Linus Torvalds

FOLL_FORCE is really only for ptrace access. As we unpin the pinned pages
using unpin_user_pages_dirty_lock(true), the assumption is that all these
pages are writable.

FOLL_FORCE in this case seems to be due to copy-and-past from other
drivers. Let's just remove it.

Acked-by: Oded Gabbay <ogabbay@kernel.org>
Cc: Oded Gabbay <ogabbay@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David Hildenbrand <redacted>
---
 drivers/misc/habanalabs/common/memory.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index ef28f3b37b93..e35cca96bbef 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -2312,8 +2312,7 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
 	if (!userptr->pages)
 		return -ENOMEM;
 
-	rc = pin_user_pages_fast(start, npages,
-				 FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM,
+	rc = pin_user_pages_fast(start, npages, FOLL_WRITE | FOLL_LONGTERM,
 				 userptr->pages);
 
 	if (rc != npages) {
-- 
2.38.1
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