From 1a9b5b7fe0c5dad8a635288882d36785dea742f9 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Wed, 16 Dec 2009 12:19:59 +0100 Subject: mm: export stable page flags Rename get_uflags() to stable_page_flags() and make it a global function for use in the hwpoison page flags filter, which need to compare user page flags with the value provided by user space. Also move KPF_* to kernel-page-flags.h for use by user space tools. Acked-by: Matt Mackall Signed-off-by: Andi Kleen CC: Nick Piggin CC: Christoph Lameter Signed-off-by: Wu Fengguang Signed-off-by: Andi Kleen --- include/linux/kernel-page-flags.h | 46 +++++++++++++++++++++++++++++++++++++++ include/linux/page-flags.h | 2 ++ 2 files changed, 48 insertions(+) create mode 100644 include/linux/kernel-page-flags.h (limited to 'include/linux') diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h new file mode 100644 index 000000000000..bd92a89f4b0a --- /dev/null +++ b/include/linux/kernel-page-flags.h @@ -0,0 +1,46 @@ +#ifndef LINUX_KERNEL_PAGE_FLAGS_H +#define LINUX_KERNEL_PAGE_FLAGS_H + +/* + * Stable page flag bits exported to user space + */ + +#define KPF_LOCKED 0 +#define KPF_ERROR 1 +#define KPF_REFERENCED 2 +#define KPF_UPTODATE 3 +#define KPF_DIRTY 4 +#define KPF_LRU 5 +#define KPF_ACTIVE 6 +#define KPF_SLAB 7 +#define KPF_WRITEBACK 8 +#define KPF_RECLAIM 9 +#define KPF_BUDDY 10 + +/* 11-20: new additions in 2.6.31 */ +#define KPF_MMAP 11 +#define KPF_ANON 12 +#define KPF_SWAPCACHE 13 +#define KPF_SWAPBACKED 14 +#define KPF_COMPOUND_HEAD 15 +#define KPF_COMPOUND_TAIL 16 +#define KPF_HUGE 17 +#define KPF_UNEVICTABLE 18 +#define KPF_HWPOISON 19 +#define KPF_NOPAGE 20 + +#define KPF_KSM 21 + +/* kernel hacking assistances + * WARNING: subject to change, never rely on them! + */ +#define KPF_RESERVED 32 +#define KPF_MLOCKED 33 +#define KPF_MAPPEDTODISK 34 +#define KPF_PRIVATE 35 +#define KPF_PRIVATE_2 36 +#define KPF_OWNER_PRIVATE 37 +#define KPF_ARCH 38 +#define KPF_UNCACHED 39 + +#endif /* LINUX_KERNEL_PAGE_FLAGS_H */ diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index f9df6308af95..feee2ba8d06a 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -282,6 +282,8 @@ PAGEFLAG_FALSE(HWPoison) #define __PG_HWPOISON 0 #endif +u64 stable_page_flags(struct page *page); + static inline int PageUptodate(struct page *page) { int ret = test_bit(PG_uptodate, &(page)->flags); -- cgit v1.2.3-59-g8ed1b