[PATCH] hugepage: is_aligned_hugepage_range() cleanup

Quite a long time back, prepare_hugepage_range() replaced
is_aligned_hugepage_range() as the callback from mm/mmap.c to arch code to
verify if an address range is suitable for a hugepage mapping.
is_aligned_hugepage_range() stuck around, but only to implement
prepare_hugepage_range() on archs which didn't implement their own.

Most archs (everything except ia64 and powerpc) used the same
implementation of is_aligned_hugepage_range().  On powerpc, which
implements its own prepare_hugepage_range(), the custom version was never
used.

In addition, "is_aligned_hugepage_range()" was a bad name, because it
suggests it returns true iff the given range is a good hugepage range,
whereas in fact it returns 0-or-error (so the sense is reversed).

This patch cleans up by abolishing is_aligned_hugepage_range().  Instead
prepare_hugepage_range() is defined directly.  Most archs use the default
version, which simply checks the given region is aligned to the size of a
hugepage.  ia64 and powerpc define custom versions.  The ia64 one simply
checks that the range is in the correct address space region in addition to
being suitably aligned.  The powerpc version (just as previously) checks
for suitable addresses, and if necessary performs low-level MMU frobbing to
set up new areas for use by hugepages.

No libhugetlbfs testsuite regressions on ppc64 (POWER5 LPAR).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/mm/hugetlbpage.c b/arch/i386/mm/hugetlbpage.c
index d524127c9afc3b2f92b3e5ad6b3dbce20bec42f7..a7d8915854116264048f62c84d63dc495fc212b7 100644 (file)
--- a/arch/i386/mm/hugetlbpage.c
+++ b/arch/i386/mm/hugetlbpage.c
@@ -48,18 +48,6 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
        return (pte_t *) pmd;
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
-       return 0;
-}
-
 #if 0  /* This is just for testing */
 struct page *
 follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)

diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 2d13889d0a9915da645b074ecbef1f8a0b56d116..9dbc7dadd1653a79b078fa1b79f1e43266db84db 100644 (file)
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -68,9 +68,10 @@ huge_pte_offset (struct mm_struct *mm, unsigned long addr)
 #define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
 
 /*
- * This function checks for proper alignment of input addr and len parameters.
+ * Don't actually need to do any preparation, but need to make sure
+ * the address is in the right region.
  */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
+int prepare_hugepage_range(unsigned long addr, unsigned long len)
 {
        if (len & ~HPAGE_MASK)
                return -EINVAL;

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index b51bb28c054bbb5e14007af0d9efee7be0806a3a..7370f9f33e2943d038025a6d05ba6b4e02755beb 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -133,21 +133,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
        return __pte(old);
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
-       if (! (within_hugepage_low_range(addr, len)
-              || within_hugepage_high_range(addr, len)) )
-               return -EINVAL;
-       return 0;
-}
-
 struct slb_flush_info {
        struct mm_struct *mm;
        u16 newareas;

diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 6b7a7688c98e87178d4915a1f17e8118213a5e63..a3568fd51508e4435dfb217f4c6d42089dc7ea0c 100644 (file)
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -84,18 +84,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
        return entry;
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
-       return 0;
-}
-
 struct page *follow_huge_addr(struct mm_struct *mm,
                              unsigned long address, int write)
 {

diff --git a/arch/sh64/mm/hugetlbpage.c b/arch/sh64/mm/hugetlbpage.c
index ed6a505b3ee2b9e7194268449067c8e8746ae681..3d89f2a6c785cf70582cac9d231fb4e729e8eb01 100644 (file)
--- a/arch/sh64/mm/hugetlbpage.c
+++ b/arch/sh64/mm/hugetlbpage.c
@@ -84,18 +84,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
        return entry;
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
-       return 0;
-}
-
 struct page *follow_huge_addr(struct mm_struct *mm,
                              unsigned long address, int write)
 {

diff --git a/arch/sparc64/mm/hugetlbpage.c b/arch/sparc64/mm/hugetlbpage.c
index a7a24869d04576b67ec56216e474fef4ff3632a8..280dc7958a13784a5485a0d3be6681cb5c2d8dea 100644 (file)
--- a/arch/sparc64/mm/hugetlbpage.c
+++ b/arch/sparc64/mm/hugetlbpage.c
@@ -263,18 +263,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
        return entry;
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-       if (len & ~HPAGE_MASK)
-               return -EINVAL;
-       if (addr & ~HPAGE_MASK)
-               return -EINVAL;
-       return 0;
-}
-
 struct page *follow_huge_addr(struct mm_struct *mm,
                              unsigned long address, int write)
 {

diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h
index 732cf308674101af5daab2896ec0b62900f044f5..3ab27333dae4c12fba4eaebbc3680d561e81f276 100644 (file)
--- a/include/asm-ia64/page.h
+++ b/include/asm-ia64/page.h
@@ -57,6 +57,7 @@
 
 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
+# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
 # define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
 #endif /* CONFIG_HUGETLB_PAGE */
 

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 5db25ffdb3eb5e16eb910ce42412cfd97f533572..d6f1019625af72294e578e2731199199e02dea15 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -36,7 +36,6 @@ struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
                              int write);
 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
                                pmd_t *pmd, int write);
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len);
 int pmd_huge(pmd_t pmd);
 void hugetlb_change_protection(struct vm_area_struct *vma,
                unsigned long address, unsigned long end, pgprot_t newprot);
@@ -54,8 +53,18 @@ void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
 #endif
 
 #ifndef ARCH_HAS_PREPARE_HUGEPAGE_RANGE
-#define prepare_hugepage_range(addr, len)      \
-       is_aligned_hugepage_range(addr, len)
+/*
+ * If the arch doesn't supply something else, assume that hugepage
+ * size aligned regions are ok without further preparation.
+ */
+static inline int prepare_hugepage_range(unsigned long addr, unsigned long len)
+{
+       if (len & ~HPAGE_MASK)
+               return -EINVAL;
+       if (addr & ~HPAGE_MASK)
+               return -EINVAL;
+       return 0;
+}
 #else
 int prepare_hugepage_range(unsigned long addr, unsigned long len);
 #endif
@@ -95,7 +104,6 @@ static inline unsigned long hugetlb_total_pages(void)
 #define hugetlb_report_meminfo(buf)            0
 #define hugetlb_report_node_meminfo(n, buf)    0
 #define follow_huge_pmd(mm, addr, pmd, write)  NULL
-#define is_aligned_hugepage_range(addr, len)   0
 #define prepare_hugepage_range(addr, len)      (-EINVAL)
 #define pmd_huge(x)    0
 #define is_hugepage_only_range(mm, addr, len)  0