linux-kernel - [PATCH v1 01/17] mm: factor out large folio handling from folio_order() into folio_large

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Message-ID: <20240829165627.2256514-2-david@redhat.com>
Date: Thu, 29 Aug 2024 18:56:04 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	x86@...nel.org,
	linux-fsdevel@...r.kernel.org,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Jonathan Corbet <corbet@....net>,
	Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH v1 01/17] mm: factor out large folio handling from folio_order() into folio_large_order()

Let's factor it out into a simple helper function. This helper will
also come in handy when working with code where we know that our
folio is large.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/mm.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index b31d4bdd65ad5..3c6270f87bdc3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1071,6 +1071,11 @@ int vma_is_stack_for_current(struct vm_area_struct *vma);
 struct mmu_gather;
 struct inode;
 
+static inline unsigned int folio_large_order(const struct folio *folio)
+{
+	return folio->_flags_1 & 0xff;
+}
+
 /*
  * compound_order() can be called without holding a reference, which means
  * that niceties like page_folio() don't work.  These callers should be
@@ -1084,7 +1089,7 @@ static inline unsigned int compound_order(struct page *page)
 
 	if (!test_bit(PG_head, &folio->flags))
 		return 0;
-	return folio->_flags_1 & 0xff;
+	return folio_large_order(folio);
 }
 
 /**
@@ -1100,7 +1105,7 @@ static inline unsigned int folio_order(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return 0;
-	return folio->_flags_1 & 0xff;
+	return folio_large_order(folio);
 }
 
 #include <linux/huge_mm.h>
@@ -2035,7 +2040,7 @@ static inline long folio_nr_pages(const struct folio *folio)
 #ifdef CONFIG_64BIT
 	return folio->_folio_nr_pages;
 #else
-	return 1L << (folio->_flags_1 & 0xff);
+	return 1L << folio_large_order(folio);
 #endif
 }
 
@@ -2060,7 +2065,7 @@ static inline unsigned long compound_nr(struct page *page)
 #ifdef CONFIG_64BIT
 	return folio->_folio_nr_pages;
 #else
-	return 1L << (folio->_flags_1 & 0xff);
+	return 1L << folio_large_order(folio);
 #endif
 }
 
-- 
2.46.0