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SubjectRe: [PATCH 17/24] mm: export stable page flags
[corrected CC to Christoph Lameter <cl@linux-foundation.org>]

On Wed, Dec 02, 2009 at 11:12:48AM +0800, Wu, Fengguang wrote:
> 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.
>
> CC: Matt Mackall <mpm@selenic.com>
> CC: Nick Piggin <npiggin@suse.de>
> CC: Christoph Lameter <clameter@sgi.com>
> CC: Andi Kleen <andi@firstfloor.org>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> ---
> fs/proc/page.c | 45 +--------------------------
> include/linux/kernel-page-flags.h | 46 ++++++++++++++++++++++++++++
> include/linux/page-flags.h | 2 +
> 3 files changed, 51 insertions(+), 42 deletions(-)
>
> --- linux-mm.orig/fs/proc/page.c 2009-11-07 20:23:59.000000000 +0800
> +++ linux-mm/fs/proc/page.c 2009-11-07 20:37:31.000000000 +0800
> @@ -8,6 +8,7 @@
> #include <linux/proc_fs.h>
> #include <linux/seq_file.h>
> #include <linux/hugetlb.h>
> +#include <linux/kernel-page-flags.h>
> #include <asm/uaccess.h>
> #include "internal.h"
>
> @@ -71,52 +72,12 @@ static const struct file_operations proc
> * physical page flags.
> */
>
> -/* These macros are used to decouple internal flags from exported ones */
> -
> -#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
> -
> static inline u64 kpf_copy_bit(u64 kflags, int ubit, int kbit)
> {
> return ((kflags >> kbit) & 1) << ubit;
> }
>
> -static u64 get_uflags(struct page *page)
> +u64 stable_page_flags(struct page *page)
> {
> u64 k;
> u64 u;
> @@ -219,7 +180,7 @@ static ssize_t kpageflags_read(struct fi
> else
> ppage = NULL;
>
> - if (put_user(get_uflags(ppage), out)) {
> + if (put_user(stable_page_flags(ppage), out)) {
> ret = -EFAULT;
> break;
> }
> --- linux-mm.orig/include/linux/page-flags.h 2009-11-07 20:37:27.000000000 +0800
> +++ linux-mm/include/linux/page-flags.h 2009-11-07 20:37:31.000000000 +0800
> @@ -284,6 +284,8 @@ 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);
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-mm/include/linux/kernel-page-flags.h 2009-11-07 20:37:31.000000000 +0800
> @@ -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 */
>


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