[PATCH] Hugepage consolidation

A lot of the code in arch/*/mm/hugetlbpage.c is quite similar.  This patch
attempts to consolidate a lot of the code across the arch's, putting the
combined version in mm/hugetlb.c.  There are a couple of uglyish hacks in
order to covert all the hugepage archs, but the result is a very large
reduction in the total amount of code.  It also means things like hugepage
lazy allocation could be implemented in one place, instead of six.

Tested, at least a little, on ppc64, i386 and x86_64.

Notes:
	- this patch changes the meaning of set_huge_pte() to be more
	  analagous to set_pte()
	- does SH4 need s special huge_ptep_get_and_clear()??

Acked-by: William Lee Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 178 deletions

diff --git a/arch/ppc64/mm/hugetlbpage.c b/arch/ppc64/mm/hugetlbpage.c
index d3bf86a5c1ad..b4ab766f5980 100644
--- a/arch/ppc64/mm/hugetlbpage.c
+++ b/arch/ppc64/mm/hugetlbpage.c
@@ -121,7 +121,7 @@ static pte_t *hugepte_alloc(struct mm_struct *mm, pud_t *dir, unsigned long addr
         return hugepte_offset(dir, addr);
 }
 
-static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
+pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
 {
         pud_t *pud;
 
@@ -134,7 +134,7 @@ static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
         return hugepte_offset(pud, addr);
 }
 
-static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
+pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
 {
         pud_t *pud;
 
@@ -147,25 +147,6 @@ static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
         return hugepte_alloc(mm, pud, addr);
 }
 
-static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
-                         unsigned long addr, struct page *page,
-                         pte_t *ptep, int write_access)
-{
-        pte_t entry;
-
-        add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE);
-        if (write_access) {
-                entry =
-                    pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
-        } else {
-                entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
-        }
-        entry = pte_mkyoung(entry);
-        entry = pte_mkhuge(entry);
-
-        set_pte_at(mm, addr, ptep, entry);
-}
-
 /*
  * This function checks for proper alignment of input addr and len parameters.
  */
@@ -259,80 +240,6 @@ int prepare_hugepage_range(unsigned long addr, unsigned long len)
         return -EINVAL;
 }
 
-int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
-                        struct vm_area_struct *vma)
-{
-        pte_t *src_pte, *dst_pte, entry;
-        struct page *ptepage;
-        unsigned long addr = vma->vm_start;
-        unsigned long end = vma->vm_end;
-        int err = -ENOMEM;
-
-        while (addr < end) {
-                dst_pte = huge_pte_alloc(dst, addr);
-                if (!dst_pte)
-                        goto out;
-
-                src_pte = huge_pte_offset(src, addr);
-                entry = *src_pte;
-                
-                ptepage = pte_page(entry);
-                get_page(ptepage);
-                add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
-                set_pte_at(dst, addr, dst_pte, entry);
-
-                addr += HPAGE_SIZE;
-        }
-
-        err = 0;
- out:
-        return err;
-}
-
-int
-follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
-                    struct page **pages, struct vm_area_struct **vmas,
-                    unsigned long *position, int *length, int i)
-{
-        unsigned long vpfn, vaddr = *position;
-        int remainder = *length;
-
-        WARN_ON(!is_vm_hugetlb_page(vma));
-
-        vpfn = vaddr/PAGE_SIZE;
-        while (vaddr < vma->vm_end && remainder) {
-                if (pages) {
-                        pte_t *pte;
-                        struct page *page;
-
-                        pte = huge_pte_offset(mm, vaddr);
-
-                        /* hugetlb should be locked, and hence, prefaulted */
-                        WARN_ON(!pte || pte_none(*pte));
-
-                        page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];
-
-                        WARN_ON(!PageCompound(page));
-
-                        get_page(page);
-                        pages[i] = page;
-                }
-
-                if (vmas)
-                        vmas[i] = vma;
-
-                vaddr += PAGE_SIZE;
-                ++vpfn;
-                --remainder;
-                ++i;
-        }
-
-        *length = remainder;
-        *position = vaddr;
-
-        return i;
-}
-
 struct page *
 follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
 {
@@ -363,89 +270,6 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
         return NULL;
 }
 
-void unmap_hugepage_range(struct vm_area_struct *vma,
-                          unsigned long start, unsigned long end)
-{
-        struct mm_struct *mm = vma->vm_mm;
-        unsigned long addr;
-        pte_t *ptep;
-        struct page *page;
-
-        WARN_ON(!is_vm_hugetlb_page(vma));
-        BUG_ON((start % HPAGE_SIZE) != 0);
-        BUG_ON((end % HPAGE_SIZE) != 0);
-
-        for (addr = start; addr < end; addr += HPAGE_SIZE) {
-                pte_t pte;
-
-                ptep = huge_pte_offset(mm, addr);
-                if (!ptep || pte_none(*ptep))
-                        continue;
-
-                pte = *ptep;
-                page = pte_page(pte);
-                pte_clear(mm, addr, ptep);
-
-                put_page(page);
-        }
-        add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT));
-        flush_tlb_pending();
-}
-
-int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
-{
-        struct mm_struct *mm = current->mm;
-        unsigned long addr;
-        int ret = 0;
-
-        WARN_ON(!is_vm_hugetlb_page(vma));
-        BUG_ON((vma->vm_start % HPAGE_SIZE) != 0);
-        BUG_ON((vma->vm_end % HPAGE_SIZE) != 0);
-
-        spin_lock(&mm->page_table_lock);
-        for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
-                unsigned long idx;
-                pte_t *pte = huge_pte_alloc(mm, addr);
-                struct page *page;
-
-                if (!pte) {
-                        ret = -ENOMEM;
-                        goto out;
-                }
-                if (! pte_none(*pte))
-                        continue;
-
-                idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
-                        + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
-                page = find_get_page(mapping, idx);
-                if (!page) {
-                        /* charge the fs quota first */
-                        if (hugetlb_get_quota(mapping)) {
-                                ret = -ENOMEM;
-                                goto out;
-                        }
-                        page = alloc_huge_page();
-                        if (!page) {
-                                hugetlb_put_quota(mapping);
-                                ret = -ENOMEM;
-                                goto out;
-                        }
-                        ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
-                        if (! ret) {
-                                unlock_page(page);
-                        } else {
-                                hugetlb_put_quota(mapping);
-                                free_huge_page(page);
-                                goto out;
-                        }
-                }
-                set_huge_pte(mm, vma, addr, page, pte, vma->vm_flags & VM_WRITE);
-        }
-out:
-        spin_unlock(&mm->page_table_lock);
-        return ret;
-}
-
 /* Because we have an exclusive hugepage region which lies within the
  * normal user address space, we have to take special measures to make
  * non-huge mmap()s evade the hugepage reserved regions. */