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From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        kernel-team@fb.com
Subject: [PATCH] mm: page_isolation: write proper kerneldoc
Date:   Fri, 19 May 2023 13:16:52 +0200
Message-Id: <20230519111652.40658-1-hannes@cmpxchg.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

And remove the incorrect header comments.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 include/linux/page-isolation.h | 24 ++++++------------------
 mm/page_isolation.c            | 29 ++++++++++++++++++++++++-----
 2 files changed, 30 insertions(+), 23 deletions(-)

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 5456b7be38ae..0ab089e89db4 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -37,24 +37,12 @@ void set_pageblock_migratetype(struct page *page, int migratetype);
 int move_freepages_block(struct zone *zone, struct page *page,
 				int migratetype, int *num_movable);
 
-/*
- * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
- */
-int
-start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			 int migratetype, int flags, gfp_t gfp_flags);
-
-/*
- * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
- * target range is [start_pfn, end_pfn)
- */
-void
-undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			int migratetype);
-
-/*
- * Test all pages in [start_pfn, end_pfn) are isolated or not.
- */
+int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+			     int migratetype, int flags, gfp_t gfp_flags);
+
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+			     int migratetype);
+
 int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
 			int isol_flags);
 
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index c6f3605e37ab..e7d7685104de 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -481,8 +481,7 @@ static int isolate_single_pageblock(unsigned long boundary_pfn, int flags,
 }
 
 /**
- * start_isolate_page_range() - make page-allocation-type of range of pages to
- * be MIGRATE_ISOLATE.
+ * start_isolate_page_range() - mark page range MIGRATE_ISOLATE
  * @start_pfn:		The lower PFN of the range to be isolated.
  * @end_pfn:		The upper PFN of the range to be isolated.
  * @migratetype:	Migrate type to set in error recovery.
@@ -571,8 +570,14 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 	return 0;
 }
 
-/*
- * Make isolated pages available again.
+/**
+ * undo_isolate_page_range - undo effects of start_isolate_page_range()
+ * @start_pfn:		The lower PFN of the isolated range
+ * @end_pfn:		The upper PFN of the isolated range
+ * @migratetype:	New migrate type to set on the range
+ *
+ * This finds every MIGRATE_ISOLATE page block in the given range
+ * and switches it to @migratetype.
  */
 void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			    int migratetype)
@@ -631,7 +636,21 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
 	return pfn;
 }
 
-/* Caller should ensure that requested range is in a single zone */
+/**
+ * test_pages_isolated - check if pageblocks in range are isolated
+ * @start_pfn:		The first PFN of the isolated range
+ * @end_pfn:		The first PFN *after* the isolated range
+ * @isol_flags:		Testing mode flags
+ *
+ * This tests if all in the specified range are free.
+ *
+ * If %MEMORY_OFFLINE is specified in @flags, it will consider
+ * poisoned and offlined pages free as well.
+ *
+ * Caller must ensure the requested range doesn't span zones.
+ *
+ * Returns 0 if true, -EBUSY if one or more pages are in use.
+ */
 int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
 			int isol_flags)
 {
-- 
2.40.0