diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/fadvise.c | 20 | ||||
| -rw-r--r-- | mm/hugetlb.c | 6 | ||||
| -rw-r--r-- | mm/memory.c | 2 | ||||
| -rw-r--r-- | mm/swapfile.c | 14 |
4 files changed, 15 insertions, 27 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c index 907c39257ca0..0a03357a1f8e 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -35,17 +35,6 @@ * * LINUX_FADV_ASYNC_WRITE: push some or all of the dirty pages at the disk. * - * LINUX_FADV_WRITE_WAIT, LINUX_FADV_ASYNC_WRITE: push all of the currently - * dirty pages at the disk. - * - * LINUX_FADV_WRITE_WAIT, LINUX_FADV_ASYNC_WRITE, LINUX_FADV_WRITE_WAIT: push - * all of the currently dirty pages at the disk, wait until they have been - * written. - * - * It should be noted that none of these operations write out the file's - * metadata. So unless the application is strictly performing overwrites of - * already-instantiated disk blocks, there are no guarantees here that the data - * will be available after a crash. */ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice) { @@ -129,15 +118,6 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice) invalidate_mapping_pages(mapping, start_index, end_index); break; - case LINUX_FADV_ASYNC_WRITE: - ret = __filemap_fdatawrite_range(mapping, offset, endbyte, - WB_SYNC_NONE); - break; - case LINUX_FADV_WRITE_WAIT: - ret = wait_on_page_writeback_range(mapping, - offset >> PAGE_CACHE_SHIFT, - endbyte >> PAGE_CACHE_SHIFT); - break; default: ret = -EINVAL; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index ebad6bbb3501..832f676ca038 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -334,6 +334,7 @@ static unsigned long set_max_huge_pages(unsigned long count) return nr_huge_pages; spin_lock(&hugetlb_lock); + count = max(count, reserved_huge_pages); try_to_free_low(count); while (count < nr_huge_pages) { struct page *page = dequeue_huge_page(NULL, 0); @@ -697,9 +698,10 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, pfn_offset = (vaddr & ~HPAGE_MASK) >> PAGE_SHIFT; page = pte_page(*pte); same_page: - get_page(page); - if (pages) + if (pages) { + get_page(page); pages[i] = page + pfn_offset; + } if (vmas) vmas[i] = vma; diff --git a/mm/memory.c b/mm/memory.c index 8d8f52569f32..0ec7bc644271 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -87,7 +87,7 @@ int randomize_va_space __read_mostly = 1; static int __init disable_randmaps(char *s) { randomize_va_space = 0; - return 0; + return 1; } __setup("norandmaps", disable_randmaps); diff --git a/mm/swapfile.c b/mm/swapfile.c index 39aa9d129612..e5fd5385f0cc 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -397,18 +397,24 @@ void free_swap_and_cache(swp_entry_t entry) p = swap_info_get(entry); if (p) { - if (swap_entry_free(p, swp_offset(entry)) == 1) - page = find_trylock_page(&swapper_space, entry.val); + if (swap_entry_free(p, swp_offset(entry)) == 1) { + page = find_get_page(&swapper_space, entry.val); + if (page && unlikely(TestSetPageLocked(page))) { + page_cache_release(page); + page = NULL; + } + } spin_unlock(&swap_lock); } if (page) { int one_user; BUG_ON(PagePrivate(page)); - page_cache_get(page); one_user = (page_count(page) == 2); /* Only cache user (+us), or swap space full? Free it! */ - if (!PageWriteback(page) && (one_user || vm_swap_full())) { + /* Also recheck PageSwapCache after page is locked (above) */ + if (PageSwapCache(page) && !PageWriteback(page) && + (one_user || vm_swap_full())) { delete_from_swap_cache(page); SetPageDirty(page); } |