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authorHugh Dickins <hugh@veritas.com>2005-04-19 13:29:16 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org.(none)>2005-04-19 13:29:16 -0700
commit3bf5ee95648c694bac4d13529563c230cd4fe5f2 (patch)
tree9430e6e4f4c3d586ecb7375cd780fd17694888c7 /arch
parentee39b37b23da0b6ec53a8ebe90ff41c016f8ae27 (diff)
[PATCH] freepgt: hugetlb_free_pgd_range
ia64 and ppc64 had hugetlb_free_pgtables functions which were no longer being called, and it wasn't obvious what to do about them. The ppc64 case turns out to be easy: the associated tables are noted elsewhere and freed later, safe to either skip its hugetlb areas or go through the motions of freeing nothing. Since ia64 does need a special case, restore to ppc64 the special case of skipping them. The ia64 hugetlb case has been broken since pgd_addr_end went in, though it probably appeared to work okay if you just had one such area; in fact it's been broken much longer if you consider a long munmap spanning from another region into the hugetlb region. In the ia64 hugetlb region, more virtual address bits are available than in the other regions, yet the page tables are structured the same way: the page at the bottom is larger. Here we need to scale down each addr before passing it to the standard free_pgd_range. Was about to write a hugely_scaled_down macro, but found htlbpage_to_page already exists for just this purpose. Fixed off-by-one in ia64 is_hugepage_only_range. Uninline free_pgd_range to make it available to ia64. Make sure the vma-gathering loop in free_pgtables cannot join a hugepage_only_range to any other (safe to join huges? probably but don't bother). Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/mm/hugetlbpage.c29
-rw-r--r--arch/ppc64/mm/hugetlbpage.c10
2 files changed, 23 insertions, 16 deletions
diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 626258ae974..df08ae7634b 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -186,13 +186,30 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int wri
return NULL;
}
-/*
- * Do nothing, until we've worked out what to do! To allow build, we
- * must remove reference to clear_page_range since it no longer exists.
- */
-void hugetlb_free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *prev,
- unsigned long start, unsigned long end)
+void hugetlb_free_pgd_range(struct mmu_gather **tlb,
+ unsigned long addr, unsigned long end,
+ unsigned long floor, unsigned long ceiling)
{
+ /*
+ * This is called only when is_hugepage_only_range(addr,),
+ * and it follows that is_hugepage_only_range(end,) also.
+ *
+ * The offset of these addresses from the base of the hugetlb
+ * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
+ * the standard free_pgd_range will free the right page tables.
+ *
+ * If floor and ceiling are also in the hugetlb region, they
+ * must likewise be scaled down; but if outside, left unchanged.
+ */
+
+ addr = htlbpage_to_page(addr);
+ end = htlbpage_to_page(end);
+ if (is_hugepage_only_range(tlb->mm, floor, HPAGE_SIZE))
+ floor = htlbpage_to_page(floor);
+ if (is_hugepage_only_range(tlb->mm, ceiling, HPAGE_SIZE))
+ ceiling = htlbpage_to_page(ceiling);
+
+ free_pgd_range(tlb, addr, end, floor, ceiling);
}
void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
diff --git a/arch/ppc64/mm/hugetlbpage.c b/arch/ppc64/mm/hugetlbpage.c
index c62ddaff072..8665bb57e42 100644
--- a/arch/ppc64/mm/hugetlbpage.c
+++ b/arch/ppc64/mm/hugetlbpage.c
@@ -430,16 +430,6 @@ void unmap_hugepage_range(struct vm_area_struct *vma,
flush_tlb_pending();
}
-void hugetlb_free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *prev,
- unsigned long start, unsigned long end)
-{
- /* Because the huge pgtables are only 2 level, they can take
- * at most around 4M, much less than one hugepage which the
- * process is presumably entitled to use. So we don't bother
- * freeing up the pagetables on unmap, and wait until
- * destroy_context() to clean up the lot. */
-}
-
int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
{
struct mm_struct *mm = current->mm;