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Thu, 11 Jan 2024 19:13:30 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 11 Jan 2024 19:13:30 +0800 From: Kefeng Wang To: Andrew Morton , CC: , , , , Kefeng Wang Subject: [PATCH v2 1/8] mm: swap: introduce pfn_swap_entry_to_folio() Date: Thu, 11 Jan 2024 19:12:32 +0800 Message-ID: <20240111111239.2453282-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240111111239.2453282-1-wangkefeng.wang@huawei.com> References: <20240111111239.2453282-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm100001.china.huawei.com (7.185.36.93) X-Rspamd-Queue-Id: 2AB142002A X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: ajuu3et4rn7pw9tn1tfusbziti3ei6qn X-HE-Tag: 1704971614-389185 X-HE-Meta: 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 +XrrZCbI uU/S2mW/Jwef3xHRomr+wDlAN6YCUEIP9YZh6PmR5dejGaS0tvD3bkZIzl6PQQjeAcSxb1JcqXKXlVzdeiWPCgfChy/jthQRWEGRhRcqrz1/xr7SipikWf1M542utqHf7Qbaind34yAv3di09UdLCNtHX3uJE8S3RoOXAd8O3w1asmpE3rFsIV33X1pvQmoFcNgf9 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce a new pfn_swap_entry_to_folio(), it is similar to pfn_swap_entry_to_page(), but return a folio, which allow us to completely replace the struct page variables with struct folio variables. Signed-off-by: Kefeng Wang Reviewed-by: Matthew Wilcox (Oracle) --- include/linux/swapops.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/swapops.h b/include/linux/swapops.h index bff1e8d97de0..85cb84e4be95 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -468,6 +468,19 @@ static inline struct page *pfn_swap_entry_to_page(swp_entry_t entry) return p; } +static inline struct folio *pfn_swap_entry_to_folio(swp_entry_t entry) +{ + struct folio *folio = pfn_folio(swp_offset_pfn(entry)); + + /* + * Any use of migration entries may only occur while the + * corresponding folio is locked + */ + BUG_ON(is_migration_entry(entry) && !folio_test_locked(folio)); + + return folio; +} + /* * A pfn swap entry is a special type of swap entry that always has a pfn stored * in the swap offset. They are used to represent unaddressable device memory