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>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index d27cf69e811d591d7cfa0314e032f69458e1fd95..1303ff6ef7be5fda90ec17be8600cb09a898c25e 100644 (file)
--- a/arch/x86/mm/pgtable.c
+++ b/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
  *
@@ -720,6 +721,23 @@ int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
        return 1;
 }
 
+/**
+ * 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
  *
@@ -750,21 +768,6 @@ int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
        return 1;
 }
 
-/**
- * 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
  *
@@ -779,6 +782,7 @@ int pmd_clear_huge(pmd_t *pmd)
 
        return 0;
 }
+#endif
 
 #ifdef CONFIG_X86_64
 /**