[PATCH v4 03/13] mm: Make HPAGE_PXD_* macros even if !THP

[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 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@redhat.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