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Message-ID: <20240327152332.950956-4-peterx@redhat.com>
Date: Wed, 27 Mar 2024 11:23:22 -0400
From: peterx@...hat.com
To: linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Cc: Yang Shi <shy828301@...il.com>,
"Kirill A . Shutemov" <kirill@...temov.name>,
Mike Kravetz <mike.kravetz@...cle.com>,
John Hubbard <jhubbard@...dia.com>,
Michael Ellerman <mpe@...erman.id.au>,
peterx@...hat.com,
Andrew Jones <andrew.jones@...ux.dev>,
Muchun Song <muchun.song@...ux.dev>,
linux-riscv@...ts.infradead.org,
linuxppc-dev@...ts.ozlabs.org,
Christophe Leroy <christophe.leroy@...roup.eu>,
Andrew Morton <akpm@...ux-foundation.org>,
Christoph Hellwig <hch@...radead.org>,
Lorenzo Stoakes <lstoakes@...il.com>,
Matthew Wilcox <willy@...radead.org>,
Rik van Riel <riel@...riel.com>,
linux-arm-kernel@...ts.infradead.org,
Andrea Arcangeli <aarcange@...hat.com>,
David Hildenbrand <david@...hat.com>,
"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>,
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Jason Gunthorpe <jgg@...dia.com>,
Mike Rapoport <rppt@...nel.org>,
Axel Rasmussen <axelrasmussen@...gle.com>
Subject: [PATCH v4 03/13] mm: Make HPAGE_PXD_* macros even if !THP
From: Peter Xu <peterx@...hat.com>
These macros can be helpful when we plan to merge hugetlb code into generic
code. Move them out and define them as long as PGTABLE_HAS_HUGE_LEAVES is
selected, because there are systems that only define HUGETLB_PAGE not THP.
One note here is HPAGE_PMD_SHIFT must be defined even if PMD_SHIFT is not
defined (e.g. !CONFIG_MMU case); it (or in other forms, like HPAGE_PMD_NR)
is already used in lots of common codes without ifdef guards. Use the old
trick to let complations work.
Here we only need to differenciate HPAGE_PXD_SHIFT definitions. All the
rest macros will be defined based on it. When at it, move HPAGE_PMD_NR /
HPAGE_PMD_ORDER over together.
Signed-off-by: Peter Xu <peterx@...hat.com>
---
include/linux/huge_mm.h | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 7576025db55d..d3bb25c39482 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 +84,25 @@ 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
+#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES
#define HPAGE_PMD_SHIFT PMD_SHIFT
-#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
+#define HPAGE_PUD_SHIFT PUD_SHIFT
+#else
+#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
+#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
+#endif
+
+#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
+#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
+#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
-#define HPAGE_PUD_SHIFT PUD_SHIFT
-#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
+#define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
+#define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
+#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern unsigned long transparent_hugepage_flags;
extern unsigned long huge_anon_orders_always;
@@ -377,13 +385,6 @@ 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)
{
--
2.44.0
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