From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: stable@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
William Kucharski <william.kucharski@oracle.com>,
Zi Yan <ziy@nvidia.com>, David Hildenbrand <david@redhat.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 1/4] mm: add thp_order
Date: Mon, 7 Jun 2021 21:08:42 +0100 [thread overview]
Message-ID: <20210607200845.3860579-2-willy@infradead.org> (raw)
In-Reply-To: <20210607200845.3860579-1-willy@infradead.org>
commit 6ffbb45826f5d9ae09aa60cd88594b7816c96190 upstream
This function returns the order of a transparent huge page. It compiles
to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: http://lkml.kernel.org/r/20200629151959.15779-4-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/huge_mm.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 93d5cf0bc716..d8b86fd39113 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -231,6 +231,19 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
else
return NULL;
}
+
+/**
+ * thp_order - Order of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ */
+static inline unsigned int thp_order(struct page *page)
+{
+ VM_BUG_ON_PGFLAGS(PageTail(page), page);
+ if (PageHead(page))
+ return HPAGE_PMD_ORDER;
+ return 0;
+}
+
static inline int hpage_nr_pages(struct page *page)
{
if (unlikely(PageTransHuge(page)))
@@ -290,6 +303,12 @@ 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 unsigned int thp_order(struct page *page)
+{
+ VM_BUG_ON_PGFLAGS(PageTail(page), page);
+ return 0;
+}
+
#define hpage_nr_pages(x) 1
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
--
2.30.2
next prev parent reply other threads:[~2021-06-07 20:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 20:08 [5.4 PATCH 0/4] Fix a CONFIG_READ_ONLY_THP_FOR_FS bug Matthew Wilcox (Oracle)
2021-06-07 20:08 ` Matthew Wilcox (Oracle) [this message]
2021-06-07 20:08 ` [PATCH 2/4] XArray: add xa_get_order Matthew Wilcox (Oracle)
2021-06-07 20:08 ` [PATCH 3/4] XArray: add xas_split Matthew Wilcox (Oracle)
2021-06-07 20:08 ` [PATCH 4/4] mm/filemap: fix storing to a THP shadow entry Matthew Wilcox (Oracle)
2021-06-08 14:58 ` [5.4 PATCH 0/4] Fix a CONFIG_READ_ONLY_THP_FOR_FS bug Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210607200845.3860579-2-willy@infradead.org \
--to=willy@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=david@redhat.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=mike.kravetz@oracle.com \
--cc=stable@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=william.kucharski@oracle.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.