From ffe1e7861211aafe12977a3ed2f11bb6fe1e77ea Mon Sep 17 00:00:00 2001
From: Peter Xu <peterx@redhat.com>
Date: Wed, 28 Jun 2023 17:53:06 -0400
Subject: [PATCH] mm/gup: cleanup next_page handling
The only path that doesn't use generic "**pages" handling is the gate vma.
Make it use the same path, meanwhile tune the next_page label upper to
cover "**pages" handling. This prepares for THP handling for "**pages".
Link: https://lkml.kernel.org/r/20230628215310.73782-5-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kirill A . Shutemov <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/gup.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c
index 818d98b34decc..d70f8f0613f4c 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1207,7 +1207,7 @@ static long __get_user_pages(struct mm_struct *mm,
if (!vma && in_gate_area(mm, start)) {
ret = get_gate_page(mm, start & PAGE_MASK,
gup_flags, &vma,
- pages ? &pages[i] : NULL);
+ pages ? &page : NULL);
if (ret)
goto out;
ctx.page_mask = 0;
@@ -1277,19 +1277,18 @@ static long __get_user_pages(struct mm_struct *mm,
ret = PTR_ERR(page);
goto out;
}
-
- goto next_page;
} else if (IS_ERR(page)) {
ret = PTR_ERR(page);
goto out;
}
+next_page:
if (pages) {
pages[i] = page;
flush_anon_page(vma, page, start);
flush_dcache_page(page);
ctx.page_mask = 0;
}
-next_page:
+
page_increm = 1 + (~(start >> PAGE_SHIFT) & ctx.page_mask);
if (page_increm > nr_pages)
page_increm = nr_pages;
--
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