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authorSidhartha Kumar <sidhartha.kumar@oracle.com>2023-01-07 00:52:51 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-01-19 04:12:57 +0300
commit02d65d6fb1aae151570c8bfd1bd77a8153d2e607 (patch)
tree6b543908838b5881c10f6aaf08bf84073cf78d63 /include
parent17e810229cb3068b692fa078bd9b3a6527e0866a (diff)
downloadlinux-02d65d6fb1aae151570c8bfd1bd77a8153d2e607.tar.xz
mm: introduce folio_is_pfmemalloc
Add a folio equivalent for page_is_pfmemalloc. This removes two instances of page_is_pfmemalloc(folio_page(folio, 0)) so the folio can be used directly. Link: https://lkml.kernel.org/r/20230106215251.599222-1-sidhartha.kumar@oracle.com Suggested-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: SeongJae Park <sj@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mm.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8a8563359946..76c97cb8ee9a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1927,6 +1927,21 @@ static inline bool page_is_pfmemalloc(const struct page *page)
}
/*
+ * Return true only if the folio has been allocated with
+ * ALLOC_NO_WATERMARKS and the low watermark was not
+ * met implying that the system is under some pressure.
+ */
+static inline bool folio_is_pfmemalloc(const struct folio *folio)
+{
+ /*
+ * lru.next has bit 1 set if the page is allocated from the
+ * pfmemalloc reserves. Callers may simply overwrite it if
+ * they do not need to preserve that information.
+ */
+ return (uintptr_t)folio->lru.next & BIT(1);
+}
+
+/*
* Only to be called by the page allocator on a freshly allocated
* page.
*/