linux-kernel - [PATCH 3/5] mm: gup: remove useless BUG_ON in __get_user

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Date:   Sat, 7 Aug 2021 17:36:18 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <imbrenda@...ux.ibm.com>, <kirill.shutemov@...ux.intel.com>,
        <jack@...e.cz>, <jhubbard@...dia.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH 3/5] mm: gup: remove useless BUG_ON in __get_user_pages()

Indeed, this BUG_ON couldn't catch anything useful. We are sure ret == 0
here because we would already bail out if ret != 0 and ret is untouched
till here.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/gup.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/gup.c b/mm/gup.c
index d6056dcab02c..d7e4507de6b1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1149,7 +1149,6 @@ static long __get_user_pages(struct mm_struct *mm,
 					 * We must stop here.
 					 */
 					BUG_ON(gup_flags & FOLL_NOWAIT);
-					BUG_ON(ret != 0);
 					goto out;
 				}
 				continue;
-- 
2.23.0