linux-kernel - [RFC PATCH 7/8] mm: Use static initialisers for 'info' field of 'struct vm

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Date:   Thu, 14 Jan 2021 17:59:33 +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>, kernel-team@...roid.com
Subject: [RFC PATCH 7/8] mm: Use static initialisers for 'info' field of 'struct vm_fault'

In preparation for const-ifying the 'info' field of 'struct vm_fault',
ensure that it is initialised using static initialisers.

Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
 mm/shmem.c    |  8 +++++---
 mm/swapfile.c | 13 ++++++++-----
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 6831d662fe01..4429e488636e 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1520,11 +1520,13 @@ static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp,
 {
 	struct vm_area_struct pvma;
 	struct page *page;
-	struct vm_fault vmf;
+	struct vm_fault vmf = {
+		.info = {
+			.vma = &pvma,
+		},
+	};
 
 	shmem_pseudo_vma_init(&pvma, info, index);
-	vmf.info.vma = &pvma;
-	vmf.info.address = 0;
 	page = swap_cluster_readahead(swap, gfp, &vmf);
 	shmem_pseudo_vma_destroy(&pvma);
 
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 96ac0725feff..2a21bf3cfdbf 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1951,8 +1951,6 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 	si = swap_info[type];
 	pte = pte_offset_map(pmd, addr);
 	do {
-		struct vm_fault vmf;
-
 		if (!is_swap_pte(*pte))
 			continue;
 
@@ -1968,9 +1966,14 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 		swap_map = &si->swap_map[offset];
 		page = lookup_swap_cache(entry, vma, addr);
 		if (!page) {
-			vmf.info.vma = vma;
-			vmf.info.address = addr;
-			vmf.pmd = pmd;
+			struct vm_fault vmf = {
+				.info = {
+					.vma = vma,
+					.address = addr,
+				},
+				.pmd = pmd,
+			};
+
 			page = swapin_readahead(entry, GFP_HIGHUSER_MOVABLE,
 						&vmf);
 		}
-- 
2.30.0.284.gd98b1dd5eaa7-goog