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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-12 10:15:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-12 10:15:10 -0700
commit1021a645344d4a77333e19e60d37b9343be0d7b7 (patch)
tree7a78ab55f27f97209ed1b85ccfd88c6d5b8416d3 /mm/rmap.c
parent7367f5b013fee33f7d40a5a10a39d5134f529ec8 (diff)
parent28957a5467bab9ed51a237d21e31055fad987887 (diff)
Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6
* 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6: hugetlb: add missing unlock in avoidcopy path in hugetlb_cow() hwpoison: rename CONFIG HWPOISON, hugetlb: support hwpoison injection for hugepage HWPOISON, hugetlb: detect hwpoison in hugetlb code HWPOISON, hugetlb: isolate corrupted hugepage HWPOISON, hugetlb: maintain mce_bad_pages in handling hugepage error HWPOISON, hugetlb: set/clear PG_hwpoison bits on hugepage HWPOISON, hugetlb: enable error handling path for hugepage hugetlb, rmap: add reverse mapping for hugepage hugetlb: move definition of is_vm_hugetlb_page() to hugepage_inline.h Fix up trivial conflicts in mm/memory-failure.c
Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index a7d0f5482634..87b9e8ad4509 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -56,6 +56,7 @@
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
+#include <linux/hugetlb.h>
#include <asm/tlbflush.h>
@@ -350,6 +351,8 @@ vma_address(struct page *page, struct vm_area_struct *vma)
pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
unsigned long address;
+ if (unlikely(is_vm_hugetlb_page(vma)))
+ pgoff = page->index << huge_page_order(page_hstate(page));
address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
if (unlikely(address < vma->vm_start || address >= vma->vm_end)) {
/* page should be within @vma mapping range */
@@ -394,6 +397,12 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm,
pte_t *pte;
spinlock_t *ptl;
+ if (unlikely(PageHuge(page))) {
+ pte = huge_pte_offset(mm, address);
+ ptl = &mm->page_table_lock;
+ goto check;
+ }
+
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
return NULL;
@@ -414,6 +423,7 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm,
}
ptl = pte_lockptr(mm, pmd);
+check:
spin_lock(ptl);
if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) {
*ptlp = ptl;
@@ -916,6 +926,12 @@ void page_remove_rmap(struct page *page)
page_clear_dirty(page);
set_page_dirty(page);
}
+ /*
+ * Hugepages are not counted in NR_ANON_PAGES nor NR_FILE_MAPPED
+ * and not charged by memcg for now.
+ */
+ if (unlikely(PageHuge(page)))
+ return;
if (PageAnon(page)) {
mem_cgroup_uncharge_page(page);
__dec_zone_page_state(page, NR_ANON_PAGES);
@@ -1524,3 +1540,46 @@ int rmap_walk(struct page *page, int (*rmap_one)(struct page *,
return rmap_walk_file(page, rmap_one, arg);
}
#endif /* CONFIG_MIGRATION */
+
+#ifdef CONFIG_HUGETLB_PAGE
+/*
+ * The following three functions are for anonymous (private mapped) hugepages.
+ * Unlike common anonymous pages, anonymous hugepages have no accounting code
+ * and no lru code, because we handle hugepages differently from common pages.
+ */
+static void __hugepage_set_anon_rmap(struct page *page,
+ struct vm_area_struct *vma, unsigned long address, int exclusive)
+{
+ struct anon_vma *anon_vma = vma->anon_vma;
+ BUG_ON(!anon_vma);
+ if (!exclusive) {
+ struct anon_vma_chain *avc;
+ avc = list_entry(vma->anon_vma_chain.prev,
+ struct anon_vma_chain, same_vma);
+ anon_vma = avc->anon_vma;
+ }
+ anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
+ page->mapping = (struct address_space *) anon_vma;
+ page->index = linear_page_index(vma, address);
+}
+
+void hugepage_add_anon_rmap(struct page *page,
+ struct vm_area_struct *vma, unsigned long address)
+{
+ struct anon_vma *anon_vma = vma->anon_vma;
+ int first;
+ BUG_ON(!anon_vma);
+ BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+ first = atomic_inc_and_test(&page->_mapcount);
+ if (first)
+ __hugepage_set_anon_rmap(page, vma, address, 0);
+}
+
+void hugepage_add_new_anon_rmap(struct page *page,
+ struct vm_area_struct *vma, unsigned long address)
+{
+ BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+ atomic_set(&page->_mapcount, 0);
+ __hugepage_set_anon_rmap(page, vma, address, 1);
+}
+#endif /* CONFIG_HUGETLB_PAGE */

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