From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: [PATCH 6/7] mm: Add thp_head
Date: Mon, 29 Jun 2020 16:19:58 +0100 [thread overview]
Message-ID: <20200629151959.15779-7-willy@infradead.org> (raw)
In-Reply-To: <20200629151959.15779-1-willy@infradead.org>
This is like compound_head() but compiles away when
CONFIG_TRANSPARENT_HUGEPAGE is not enabled.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/huge_mm.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index dcdfd21763a3..bd13e9ac3437 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -266,6 +266,15 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
return NULL;
}
+/**
+ * thp_head - Head page of a transparent huge page.
+ * @page: Any page (tail, head or regular) found in the page cache.
+ */
+static inline struct page *thp_head(struct page *page)
+{
+ return compound_head(page);
+}
+
/**
* thp_order - Order of a transparent huge page.
* @page: Head page of a transparent huge page.
@@ -342,6 +351,12 @@ static inline struct list_head *page_deferred_list(struct page *page)
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
+static inline struct page *thp_head(struct page *page)
+{
+ VM_BUG_ON_PGFLAGS(PageTail(page), page);
+ return page;
+}
+
static inline unsigned int thp_order(struct page *page)
{
VM_BUG_ON_PGFLAGS(PageTail(page), page);
--
2.27.0
next prev parent reply other threads:[~2020-06-29 21:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-29 15:19 [PATCH 0/7] THP prep patches Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 1/7] mm: Store compound_nr as well as compound_order Matthew Wilcox (Oracle)
2020-06-29 16:22 ` Ira Weiny
2020-06-29 16:24 ` Matthew Wilcox
2020-07-06 10:29 ` Kirill A. Shutemov
2020-08-11 22:53 ` Matthew Wilcox
2020-06-29 15:19 ` [PATCH 2/7] mm: Move page-flags include to top of file Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 3/7] mm: Add thp_order Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 4/7] mm: Add thp_size Matthew Wilcox (Oracle)
2020-06-29 15:19 ` [PATCH 5/7] mm: Replace hpage_nr_pages with thp_nr_pages Matthew Wilcox (Oracle)
2020-06-29 17:40 ` Mike Kravetz
2020-06-29 18:14 ` Matthew Wilcox
2020-06-29 18:32 ` Matthew Wilcox
2020-07-01 1:33 ` Andrew Morton
2020-06-29 15:19 ` Matthew Wilcox (Oracle) [this message]
2020-06-29 15:19 ` [PATCH 7/7] mm: Introduce offset_in_thp Matthew Wilcox (Oracle)
2020-06-29 17:11 ` [PATCH 0/7] THP prep patches William Kucharski
2020-06-29 18:13 ` Zi Yan
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