From 478c5ffc0b50527bd2390f2daa46cc16276b8413 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Wed, 16 Dec 2009 12:19:59 +0100 Subject: HWPOISON: add page flags filter When specified, only poison pages if ((page_flags & mask) == value). - corrupt-filter-flags-mask - corrupt-filter-flags-value This allows stress testing of many kinds of pages. Strictly speaking, the buddy pages requires taking zone lock, to avoid setting PG_hwpoison on a "was buddy but now allocated to someone" page. However we can just do nothing because we set PG_locked in the beginning, this prevents the page allocator from allocating it to someone. (It will BUG() on the unexpected PG_locked, which is fine for hwpoison testing.) [AK: Add select PROC_PAGE_MONITOR to satisfy dependency] CC: Nick Piggin Signed-off-by: Wu Fengguang Signed-off-by: Andi Kleen --- mm/hwpoison-inject.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'mm/hwpoison-inject.c') diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c index 2b6b3200fa65..c4dfd89f654a 100644 --- a/mm/hwpoison-inject.c +++ b/mm/hwpoison-inject.c @@ -102,6 +102,16 @@ static int pfn_inject_init(void) if (!dentry) goto fail; + dentry = debugfs_create_u64("corrupt-filter-flags-mask", 0600, + hwpoison_dir, &hwpoison_filter_flags_mask); + if (!dentry) + goto fail; + + dentry = debugfs_create_u64("corrupt-filter-flags-value", 0600, + hwpoison_dir, &hwpoison_filter_flags_value); + if (!dentry) + goto fail; + return 0; fail: pfn_inject_exit(); -- cgit v1.2.3