asm-generic: pgalloc: provide generic pgd_free()

Most architectures define pgd_free() as a wrapper for free_page().

Provide a generic version in asm-generic/pgalloc.h and enable its use for
most architectures.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>	[m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-7-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/alpha/include/asm/pgalloc.h b/arch/alpha/include/asm/pgalloc.h
index 4834cd5..9c6a24f 100644 (file)
--- a/arch/alpha/include/asm/pgalloc.h
+++ b/arch/alpha/include/asm/pgalloc.h
@@ -34,10 +34,4 @@ pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 
 extern pgd_t *pgd_alloc(struct mm_struct *mm);
 
-static inline void
-pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long)pgd);
-}
-
 #endif /* _ALPHA_PGALLOC_H */

diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index c5bdfd4..15f4674 100644 (file)
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -65,6 +65,7 @@ static inline void clean_pte_table(pte_t *pte)
 
 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
 #define __HAVE_ARCH_PTE_ALLOC_ONE
+#define __HAVE_ARCH_PGD_FREE
 #include <asm-generic/pgalloc.h>
 
 static inline pte_t *

diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h
index 0965945..3c6a7f5 100644 (file)
--- a/arch/arm64/include/asm/pgalloc.h
+++ b/arch/arm64/include/asm/pgalloc.h
@@ -13,6 +13,7 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
+#define __HAVE_ARCH_PGD_FREE
 #include <asm-generic/pgalloc.h>
 
 #define PGD_SIZE       (PTRS_PER_PGD * sizeof(pgd_t))

diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h
index c7c1ed2..d58d814 100644 (file)
--- a/arch/csky/include/asm/pgalloc.h
+++ b/arch/csky/include/asm/pgalloc.h
@@ -9,7 +9,7 @@
 #include <linux/sched.h>
 
 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
-#include <asm-generic/pgalloc.h>       /* for pte_{alloc,free}_one */
+#include <asm-generic/pgalloc.h>
 
 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
                                        pte_t *pte)
@@ -42,11 +42,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
        return pte;
 }
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_pages((unsigned long)pgd, PGD_ORDER);
-}
-
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
        pgd_t *ret;

diff --git a/arch/hexagon/include/asm/pgalloc.h b/arch/hexagon/include/asm/pgalloc.h
index cc9be51..f0c47e6 100644 (file)
--- a/arch/hexagon/include/asm/pgalloc.h
+++ b/arch/hexagon/include/asm/pgalloc.h
@@ -11,7 +11,7 @@
 #include <asm/mem-layout.h>
 #include <asm/atomic.h>
 
-#include <asm-generic/pgalloc.h>       /* for pte_{alloc,free}_one */
+#include <asm-generic/pgalloc.h>
 
 extern unsigned long long kmap_generation;
 
@@ -41,11 +41,6 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
        return pgd;
 }
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long) pgd);
-}
-
 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
                                pgtable_t pte)
 {

diff --git a/arch/ia64/include/asm/pgalloc.h b/arch/ia64/include/asm/pgalloc.h
index 06f8035..9601cfe 100644 (file)
--- a/arch/ia64/include/asm/pgalloc.h
+++ b/arch/ia64/include/asm/pgalloc.h
@@ -29,11 +29,6 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
        return (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 }
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long)pgd);
-}
-
 #if CONFIG_PGTABLE_LEVELS == 4
 static inline void
 p4d_populate(struct mm_struct *mm, p4d_t * p4d_entry, pud_t * pud)

diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index 11b95da..000f648 100644 (file)
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -13,7 +13,7 @@
 
 #include <asm/tlb.h>
 
-#include <asm-generic/pgalloc.h>       /* for pte_{alloc,free}_one */
+#include <asm-generic/pgalloc.h>
 
 extern const char bad_pmd_string[];
 
@@ -40,11 +40,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
  */
 #define pmd_free(mm, x)                        do { } while (0)
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-        free_page((unsigned long) pgd);
-}
-
 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
 {
      pgd_t *new_pgd;

diff --git a/arch/microblaze/include/asm/pgalloc.h b/arch/microblaze/include/asm/pgalloc.h
index ebb6b79..8839ce0 100644 (file)
--- a/arch/microblaze/include/asm/pgalloc.h
+++ b/arch/microblaze/include/asm/pgalloc.h
@@ -28,12 +28,6 @@ static inline pgd_t *get_pgd(void)
        return (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
 }
 
-static inline void free_pgd(pgd_t *pgd)
-{
-       free_page((unsigned long)pgd);
-}
-
-#define pgd_free(mm, pgd)      free_pgd(pgd)
 #define pgd_alloc(mm)          get_pgd()
 
 #define pmd_pgtable(pmd)       pmd_page(pmd)

diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index e5a8409..8b18424 100644 (file)
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -49,11 +49,6 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 extern void pgd_init(unsigned long page);
 extern pgd_t *pgd_alloc(struct mm_struct *mm);
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_pages((unsigned long)pgd, PGD_ORDER);
-}
-
 #define __pte_free_tlb(tlb,pte,address)                        \
 do {                                                   \
        pgtable_pte_page_dtor(pte);                     \

diff --git a/arch/nds32/mm/mm-nds32.c b/arch/nds32/mm/mm-nds32.c
index 8503bee..55bec50 100644 (file)
--- a/arch/nds32/mm/mm-nds32.c
+++ b/arch/nds32/mm/mm-nds32.c
@@ -2,6 +2,8 @@
 // Copyright (C) 2005-2017 Andes Technology Corporation
 
 #include <linux/init_task.h>
+
+#define __HAVE_ARCH_PGD_FREE
 #include <asm/pgalloc.h>
 
 #define FIRST_KERNEL_PGD_NR    (USER_PTRS_PER_PGD)

diff --git a/arch/nios2/include/asm/pgalloc.h b/arch/nios2/include/asm/pgalloc.h
index 0b146d7..e6600d2 100644 (file)
--- a/arch/nios2/include/asm/pgalloc.h
+++ b/arch/nios2/include/asm/pgalloc.h
@@ -12,7 +12,7 @@
 
 #include <linux/mm.h>
 
-#include <asm-generic/pgalloc.h>       /* for pte_{alloc,free}_one */
+#include <asm-generic/pgalloc.h>
 
 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
        pte_t *pte)
@@ -34,11 +34,6 @@ extern void pmd_init(unsigned long page, unsigned long pagetable);
 
 extern pgd_t *pgd_alloc(struct mm_struct *mm);
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_pages((unsigned long)pgd, PGD_ORDER);
-}
-
 #define __pte_free_tlb(tlb, pte, addr)                         \
        do {                                                    \
                pgtable_pte_page_dtor(pte);                     \

diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index 689766b..cc7ecc2 100644 (file)
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -11,6 +11,7 @@
 #include <asm/cache.h>
 
 #define __HAVE_ARCH_PMD_FREE
+#define __HAVE_ARCH_PGD_FREE
 #include <asm-generic/pgalloc.h>
 
 /* Allocate the top level pgd (page directory)

diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
index 8d3135f..23b1544 100644 (file)
--- a/arch/riscv/include/asm/pgalloc.h
+++ b/arch/riscv/include/asm/pgalloc.h
@@ -55,11 +55,6 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
        return pgd;
 }
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long)pgd);
-}
-
 #ifndef __PAGETABLE_PMD_FOLDED
 
 #define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)

diff --git a/arch/sh/include/asm/pgalloc.h b/arch/sh/include/asm/pgalloc.h
index 811afb5..0e6b0be 100644 (file)
--- a/arch/sh/include/asm/pgalloc.h
+++ b/arch/sh/include/asm/pgalloc.h
@@ -6,6 +6,7 @@
 
 #define __HAVE_ARCH_PMD_ALLOC_ONE
 #define __HAVE_ARCH_PMD_FREE
+#define __HAVE_ARCH_PGD_FREE
 #include <asm-generic/pgalloc.h>
 
 extern pgd_t *pgd_alloc(struct mm_struct *);

diff --git a/arch/um/include/asm/pgalloc.h b/arch/um/include/asm/pgalloc.h
index bdde433..5393e13 100644 (file)
--- a/arch/um/include/asm/pgalloc.h
+++ b/arch/um/include/asm/pgalloc.h
@@ -25,7 +25,6 @@
  * Allocate and free page tables.
  */
 extern pgd_t *pgd_alloc(struct mm_struct *);
-extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 
 #define __pte_free_tlb(tlb,pte, address)               \
 do {                                                   \

diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index a4accb1..9242dc9 100644 (file)
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -196,11 +196,6 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
        return pgd;
 }
 
-void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long) pgd);
-}
-
 void *uml_kmalloc(int size, int flags)
 {
        return kmalloc(size, flags);

diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h
index 3d1085a..62ad61d 100644 (file)
--- a/arch/x86/include/asm/pgalloc.h
+++ b/arch/x86/include/asm/pgalloc.h
@@ -7,6 +7,7 @@
 #include <linux/pagemap.h>
 
 #define __HAVE_ARCH_PTE_ALLOC_ONE
+#define __HAVE_ARCH_PGD_FREE
 #include <asm-generic/pgalloc.h>
 
 static inline int  __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; }

diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h
index 5553abe..d3a22da 100644 (file)
--- a/arch/xtensa/include/asm/pgalloc.h
+++ b/arch/xtensa/include/asm/pgalloc.h
@@ -33,11 +33,6 @@ pgd_alloc(struct mm_struct *mm)
        return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
 }
 
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-       free_page((unsigned long)pgd);
-}
-
 static inline void ptes_clear(pte_t *ptep)
 {
        int i;

diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
index d361574..6f44810 100644 (file)
--- a/include/asm-generic/pgalloc.h
+++ b/include/asm-generic/pgalloc.h
@@ -175,6 +175,13 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 
 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
 
+#ifndef __HAVE_ARCH_PGD_FREE
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+       free_page((unsigned long)pgd);
+}
+#endif
+
 #endif /* CONFIG_MMU */
 
 #endif /* __ASM_GENERIC_PGALLOC_H */