linux-kernel - [PATCH -next 1/8] mm: memory_hotplug: add pfn_to_online

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Date:   Tue, 13 Dec 2022 17:27:28 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        SeongJae Park <sj@...nel.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <damon@...ts.linux.dev>, <vishal.moola@...il.com>,
        <willy@...radead.org>, Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH -next 1/8] mm: memory_hotplug: add pfn_to_online_folio()

Introduce a wrapper function pfn_to_online_folio(), which calls
pfn_to_online_page() and returns the folio of the page found,
or null if no page.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/linux/memory_hotplug.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 9fcbf5706595..e841e4fb52a7 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -265,6 +265,13 @@ static inline void pgdat_kswapd_unlock(pg_data_t *pgdat) {}
 static inline void pgdat_kswapd_lock_init(pg_data_t *pgdat) {}
 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 
+static inline struct folio *pfn_to_online_folio(unsigned long pfn)
+{
+	struct page *page = pfn_to_online_page(pfn);
+
+	return page ? page_folio(page) : NULL;
+}
+
 /*
  * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
  * platforms might override and use arch_get_mappable_range()
-- 
2.35.3