X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=mm%2Frmap.c;h=cdbd31285cf670b80c4fed6bb5337bc1da7f7e7b;hb=ddb5f1a61f4336a808a9d5a32dd02052d5110946;hp=d9d42316a99a917ff6562c7cbc54dd50a085a1f6;hpb=6f2a1c1e78771a78c1696f5a67e8320e76a8dc0b;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git diff --git a/mm/rmap.c b/mm/rmap.c index d9d4231..cdbd312 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -103,6 +103,7 @@ static inline void anon_vma_free(struct anon_vma *anon_vma) * LOCK should suffice since the actual taking of the lock must * happen _before_ what follows. */ + might_sleep(); if (rwsem_is_locked(&anon_vma->root->rwsem)) { anon_vma_lock_write(anon_vma); anon_vma_unlock_write(anon_vma); @@ -426,8 +427,9 @@ struct anon_vma *page_get_anon_vma(struct page *page) * above cannot corrupt). */ if (!page_mapped(page)) { + rcu_read_unlock(); put_anon_vma(anon_vma); - anon_vma = NULL; + return NULL; } out: rcu_read_unlock(); @@ -477,9 +479,9 @@ struct anon_vma *page_lock_anon_vma_read(struct page *page) } if (!page_mapped(page)) { + rcu_read_unlock(); put_anon_vma(anon_vma); - anon_vma = NULL; - goto out; + return NULL; } /* we pinned the anon_vma, its safe to sleep */ @@ -1322,9 +1324,19 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, BUG_ON(!page || PageAnon(page)); if (locked_vma) { - mlock_vma_page(page); /* no-op if already mlocked */ - if (page == check_page) + if (page == check_page) { + /* we know we have check_page locked */ + mlock_vma_page(page); ret = SWAP_MLOCK; + } else if (trylock_page(page)) { + /* + * If we can lock the page, perform mlock. + * Otherwise leave the page alone, it will be + * eventually encountered again later. + */ + mlock_vma_page(page); + unlock_page(page); + } continue; /* don't unmap */ } @@ -1360,8 +1372,9 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, } static int try_to_unmap_nonlinear(struct page *page, - struct address_space *mapping, struct vm_area_struct *vma) + struct address_space *mapping, void *arg) { + struct vm_area_struct *vma; int ret = SWAP_AGAIN; unsigned long cursor; unsigned long max_nl_cursor = 0; @@ -1543,10 +1556,9 @@ void __put_anon_vma(struct anon_vma *anon_vma) { struct anon_vma *root = anon_vma->root; + anon_vma_free(anon_vma); if (root != anon_vma && atomic_dec_and_test(&root->refcount)) anon_vma_free(root); - - anon_vma_free(anon_vma); } static struct anon_vma *rmap_walk_anon_lock(struct page *page, @@ -1663,7 +1675,7 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc) if (list_empty(&mapping->i_mmap_nonlinear)) goto done; - ret = rwc->file_nonlinear(page, mapping, vma); + ret = rwc->file_nonlinear(page, mapping, rwc->arg); done: mutex_unlock(&mapping->i_mmap_mutex);