linux-kernel - [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct vm

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Message-Id: <20210120173612.20913-9-will@kernel.org>
Date:   Wed, 20 Jan 2021 17:36:12 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Hugh Dickins <hughd@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        kernel-team@...roid.com
Subject: [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct vm_fault' as 'const'

The fields of this struct are only ever read after being initialised, so
mark it 'const' before somebody tries to modify it again.

Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e0f056753bef..7ff3d9817d38 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -514,7 +514,7 @@ static inline bool fault_flag_allow_retry_first(unsigned int flags)
  * pgoff should be used in favour of virtual_address, if possible.
  */
 struct vm_fault {
-	struct {
+	const struct {
 		struct vm_area_struct *vma;	/* Target VMA */
 		gfp_t gfp_mask;			/* gfp mask to be used for allocations */
 		pgoff_t pgoff;			/* Logical page offset based on vma */
-- 
2.30.0.284.gd98b1dd5eaa7-goog