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authorDavid Gibson <david@gibson.dropbear.id.au>2006-03-22 00:09:01 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:54:04 -0800
commit42b88befd6e0dae1a5fe04c03925037fa890e1f3 (patch)
treec234584f797e65e1bcd0d4675d56d1eb004d6681
parent3915bcf38fe0b6d130b4bbde97804f29a0becf32 (diff)
downloadop-kernel-dev-42b88befd6e0dae1a5fe04c03925037fa890e1f3.zip
op-kernel-dev-42b88befd6e0dae1a5fe04c03925037fa890e1f3.tar.gz
[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>
-rw-r--r--arch/i386/mm/hugetlbpage.c12
-rw-r--r--arch/ia64/mm/hugetlbpage.c5
-rw-r--r--arch/powerpc/mm/hugetlbpage.c15
-rw-r--r--arch/sh/mm/hugetlbpage.c12
-rw-r--r--arch/sh64/mm/hugetlbpage.c12
-rw-r--r--arch/sparc64/mm/hugetlbpage.c12
-rw-r--r--include/asm-ia64/page.h1
-rw-r--r--include/linux/hugetlb.h16
8 files changed, 16 insertions, 69 deletions
diff --git a/arch/i386/mm/hugetlbpage.c b/arch/i386/mm/hugetlbpage.c
index d524127..a7d8915 100644
--- 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 2d13889..9dbc7da 100644
--- 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 b51bb28..7370f9f 100644
--- 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 6b7a768..a3568fd 100644
--- 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 ed6a505..3d89f2a 100644
--- 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 a7a2486..280dc79 100644
--- 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 732cf30..3ab27333 100644
--- 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 5db25ff..d6f1019 100644
--- 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
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