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| author | Johannes Weiner <hannes@cmpxchg.org> | 2023-05-19 13:16:52 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-20 01:18:59 +0200 |
| commit | ce5df7764b3b2abaf3687c460a9a1922daaed5b7 (patch) | |
| tree | b03146da52ffca7454cc8dd7bc8643a9832a154e /mm/page_isolation.c | |
| parent | mm/gup: disallow FOLL_LONGTERM GUP-fast writing to file-backed mappings (diff) | |
| download | linux-ce5df7764b3b2abaf3687c460a9a1922daaed5b7.tar.xz linux-ce5df7764b3b2abaf3687c460a9a1922daaed5b7.zip | |
mm: page_isolation: write proper kerneldoc
And remove the incorrect header comments.
[akpm@linux-foundation.org: s/lower/first/, s/upper/last/, per Mike]
Link: https://lkml.kernel.org/r/20230519111652.40658-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page_isolation.c')
| -rw-r--r-- | mm/page_isolation.c | 33 |
1 files changed, 26 insertions, 7 deletions
diff --git a/mm/page_isolation.c b/mm/page_isolation.c index c6f3605e37ab..6599cc965e21 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -481,10 +481,9 @@ failed: } /** - * start_isolate_page_range() - make page-allocation-type of range of pages to - * be MIGRATE_ISOLATE. - * @start_pfn: The lower PFN of the range to be isolated. - * @end_pfn: The upper PFN of the range to be isolated. + * start_isolate_page_range() - mark page range MIGRATE_ISOLATE + * @start_pfn: The first PFN of the range to be isolated. + * @end_pfn: The last PFN of the range to be isolated. * @migratetype: Migrate type to set in error recovery. * @flags: The following flags are allowed (they can be combined in * a bit mask) @@ -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 first PFN of the isolated range + * @end_pfn: The last 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) { |