[PATCH v2 04/13] mm: Make HPAGE_PXD_* macros even if !THP

From: peterx@redhat.com
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: James Houghton <jthoughton@google.com>,
	David Hildenbrand <david@redhat.com>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Yang Shi <shy828301@gmail.com>,
	peterx@redhat.com, linux-riscv@lists.infradead.org,
	Andrew Morton <akpm@linux-foundation.org>,
	"Aneesh Kumar K . V" <aneesh.kumar@kernel.org>,
	Rik van Riel <riel@surriel.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Mike Rapoport <rppt@kernel.org>,
	John Hubbard <jhubbard@nvidia.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Andrew Jones <andrew.jones@linux.dev>,
	linuxppc-dev@lists.ozlabs.org,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Muchun Song <muchun.song@linux.dev>,
	linux-arm-kernel@lists.infradead.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	Christoph Hellwig <hch@infradead.org>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	Matthew Wilcox <willy@infradead.org>
Subject: [PATCH v2 04/13] mm: Make HPAGE_PXD_* macros even if !THP
Date: Wed,  3 Jan 2024 17:14:14 +0800	[thread overview]
Message-ID: <20240103091423.400294-5-peterx@redhat.com> (raw)
In-Reply-To: <20240103091423.400294-1-peterx@redhat.com>

From: Peter Xu <peterx@redhat.com>

These macros can be helpful when we plan to merge hugetlb code into generic
code.  Move them out and define them even if !THP.

We actually already defined HPAGE_PMD_NR for other reasons even if !THP.
Reorganize these macros.

Reviewed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/linux/huge_mm.h | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 5adb86af35fc..96bd4b5d027e 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -64,9 +64,6 @@ ssize_t single_hugepage_flag_show(struct kobject *kobj,
 				  enum transparent_hugepage_flag flag);
 extern struct kobj_attribute shmem_enabled_attr;
 
-#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
-#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
-
 /*
  * Mask of all large folio orders supported for anonymous THP; all orders up to
  * and including PMD_ORDER, except order-0 (which is not "huge") and order-1
@@ -87,14 +84,19 @@ extern struct kobj_attribute shmem_enabled_attr;
 #define thp_vma_allowable_order(vma, vm_flags, smaps, in_pf, enforce_sysfs, order) \
 	(!!thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf, enforce_sysfs, BIT(order)))
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 #define HPAGE_PMD_SHIFT PMD_SHIFT
 #define HPAGE_PMD_SIZE	((1UL) << HPAGE_PMD_SHIFT)
 #define HPAGE_PMD_MASK	(~(HPAGE_PMD_SIZE - 1))
+#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
+#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
 
 #define HPAGE_PUD_SHIFT PUD_SHIFT
 #define HPAGE_PUD_SIZE	((1UL) << HPAGE_PUD_SHIFT)
 #define HPAGE_PUD_MASK	(~(HPAGE_PUD_SIZE - 1))
+#define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
+#define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 
 extern unsigned long transparent_hugepage_flags;
 extern unsigned long huge_anon_orders_always;
@@ -377,13 +379,6 @@ static inline bool thp_migration_supported(void)
 }
 
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
-#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
-#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
-#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
-
-#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
-#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
-#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 
 static inline bool folio_test_pmd_mappable(struct folio *folio)
 {
-- 
2.41.0


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