+ mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch added to -mm tree

+ mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch added to -mm tree

[akpm]

The patch titled
     Subject: x86: define only {pud/pmd}_{set/clear}_huge when useful
has been added to the -mm tree.  Its filename is
     mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch

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------------------------------------------------------
From: Christophe Leroy <christophe.leroy@csgroup.eu>
Subject: x86: define only {pud/pmd}_{set/clear}_huge when useful

When PUD and/or PMD are folded, those functions are useless and we have a
stub in linux/pgtable.h

Link: https://lkml.kernel.org/r/7fbf1b6bc3e15c07c24fa45278d57064f14c896b.1620930415.git.christophe.leroy@csgroup.eu
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86/mm/pgtable.c |   34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

--- a/arch/x86/mm/pgtable.c~mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2
+++ a/arch/x86/mm/pgtable.c
@@ -682,6 +682,7 @@ int p4d_clear_huge(p4d_t *p4d)
 }
 #endif
 
+#if CONFIG_PGTABLE_LEVELS > 3
 /**
  * pud_set_huge - setup kernel PUD mapping
  *
@@ -721,6 +722,23 @@ int pud_set_huge(pud_t *pud, phys_addr_t
 }
 
 /**
+ * pud_clear_huge - clear kernel PUD mapping when it is set
+ *
+ * Returns 1 on success and 0 on failure (no PUD map is found).
+ */
+int pud_clear_huge(pud_t *pud)
+{
+	if (pud_large(*pud)) {
+		pud_clear(pud);
+		return 1;
+	}
+
+	return 0;
+}
+#endif
+
+#if CONFIG_PGTABLE_LEVELS > 2
+/**
  * pmd_set_huge - setup kernel PMD mapping
  *
  * See text over pud_set_huge() above.
@@ -751,21 +769,6 @@ int pmd_set_huge(pmd_t *pmd, phys_addr_t
 }
 
 /**
- * pud_clear_huge - clear kernel PUD mapping when it is set
- *
- * Returns 1 on success and 0 on failure (no PUD map is found).
- */
-int pud_clear_huge(pud_t *pud)
-{
-	if (pud_large(*pud)) {
-		pud_clear(pud);
-		return 1;
-	}
-
-	return 0;
-}
-
-/**
  * pmd_clear_huge - clear kernel PMD mapping when it is set
  *
  * Returns 1 on success and 0 on failure (no PMD map is found).
@@ -779,6 +782,7 @@ int pmd_clear_huge(pmd_t *pmd)
 
 	return 0;
 }
+#endif
 
 #ifdef CONFIG_X86_64
 /**
_

Patches currently in -mm which might be from christophe.leroy@csgroup.eu are

mm-ioremap-fix-iomap_max_page_shift.patch
mm-hugetlb-change-parameters-of-arch_make_huge_pte.patch
mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge.patch
mm-pgtable-add-stubs-for-pmd-pub_set-clear_huge-fix-2.patch
mm-vmalloc-enable-mapping-of-huge-pages-at-pte-level-in-vmap.patch
mm-vmalloc-enable-mapping-of-huge-pages-at-pte-level-in-vmalloc.patch
powerpc-8xx-add-support-for-huge-pages-on-vmap-and-vmalloc.patch