linux-kernel - [PATCH 02/18] mm: use kunmap_local_dirty in memcpy_to

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Message-Id: <20210615132456.753241-3-hch@lst.de>
Date:   Tue, 15 Jun 2021 15:24:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>, Thomas Gleixner <tglx@...utronix.de>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Geoff Levand <geoff@...radead.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Dongsheng Yang <dongsheng.yang@...ystack.cn>,
        Mike Snitzer <snitzer@...hat.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        ceph-devel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: [PATCH 02/18] mm: use kunmap_local_dirty in memcpy_to_page

memcpy_to_page can write to potentially mapped page cache pages, so
use kunmap_local_dirty to make sure flush_kernel_dcache_pages is
called.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/linux/highmem.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 65f548db4f2d..d0497c0daf80 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -333,7 +333,7 @@ static inline void memcpy_to_page(struct page *page, size_t offset,
 
 	VM_BUG_ON(offset + len > PAGE_SIZE);
 	memcpy(to + offset, from, len);
-	kunmap_local(to);
+	kunmap_local_dirty(page, to);
 }
 
 static inline void memzero_page(struct page *page, size_t offset, size_t len)
-- 
2.30.2