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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2015-02-11 01:09:59 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 01:30:31 +0300
commit27ba0644ea9dfe6e7693abc85837b60e40583b96 (patch)
treea1e04ba5026728711bde87cb2f336d2444ee6ffe /mm/migrate.c
parent1da4b35b001481df99a6dcab12d5d39a876f7056 (diff)
downloadlinux-27ba0644ea9dfe6e7693abc85837b60e40583b96.tar.xz
rmap: drop support of non-linear mappings
We don't create non-linear mappings anymore. Let's drop code which handles them in rmap. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c32
1 files changed, 0 insertions, 32 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 344cdf692fc8..6e284bcca8bb 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -179,37 +179,6 @@ out:
}
/*
- * Congratulations to trinity for discovering this bug.
- * mm/fremap.c's remap_file_pages() accepts any range within a single vma to
- * convert that vma to VM_NONLINEAR; and generic_file_remap_pages() will then
- * replace the specified range by file ptes throughout (maybe populated after).
- * If page migration finds a page within that range, while it's still located
- * by vma_interval_tree rather than lost to i_mmap_nonlinear list, no problem:
- * zap_pte() clears the temporary migration entry before mmap_sem is dropped.
- * But if the migrating page is in a part of the vma outside the range to be
- * remapped, then it will not be cleared, and remove_migration_ptes() needs to
- * deal with it. Fortunately, this part of the vma is of course still linear,
- * so we just need to use linear location on the nonlinear list.
- */
-static int remove_linear_migration_ptes_from_nonlinear(struct page *page,
- struct address_space *mapping, void *arg)
-{
- struct vm_area_struct *vma;
- /* hugetlbfs does not support remap_pages, so no huge pgoff worries */
- pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
- unsigned long addr;
-
- list_for_each_entry(vma,
- &mapping->i_mmap_nonlinear, shared.nonlinear) {
-
- addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
- if (addr >= vma->vm_start && addr < vma->vm_end)
- remove_migration_pte(page, vma, addr, arg);
- }
- return SWAP_AGAIN;
-}
-
-/*
* Get rid of all migration entries and replace them by
* references to the indicated page.
*/
@@ -218,7 +187,6 @@ static void remove_migration_ptes(struct page *old, struct page *new)
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
.arg = old,
- .file_nonlinear = remove_linear_migration_ptes_from_nonlinear,
};
rmap_walk(new, &rwc);