Andy Whitcroft
0cad47cf13
page-flags: record page flag overlays explicitly ...
With the recent page flag reorganisation we have a single enum which
defines the valid page flags and their values, nice and clear. However
there are a number of bits which are overloaded by different subsystems.
Firstly there is PG_owner_priv_1 which is used by filesystems and by XEN.
Secondly both SLOB and SLUB use a couple of extra page bits to manage
internal state for pages they own; both overlay other bits. All of these
"aliases" are scattered about the source making it very hard for a reader
to know if the bits are safe to rely on in all contexts; confusion here is
bad.
As we now have a single place where the bits are clearly assigned it makes
sense to clarify the reuse of bits by making the aliases explicit and
visible with the original bit assignments. This patch creates explicit
aliases within the enum itself for the overloaded bits, creates standard
bit accessors PageFoo etc. and uses those throughout.
This version pulls the bit manipulation out to standard named page bit
accessors as suggested by Christoph, it retains the explicit mapping to
the overlayed bits. A fusion of both ideas. This has been SLUB and SLOB
have been compile tested on x86_64 only, and SLUB boot tested. If people
feel this is worth doing then I can run a fuller set of testing.
This patch:
Some page flags are used for more than one purpose, for example
PG_owner_priv_1. Currently there are individual accessors for each user,
each built using the common flag name far away from the bit definitions.
This makes it hard to see all possible uses of these bits.
Now that we have a single enum to generate the bit orders it makes sense
to express overlays in the same place. So create per use aliases for this
bit in the main page-flags enum and use those in the accessors.
[akpm@linux-foundation.org: fix xen]
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24 10:47:15 -07:00
lockd: Pass "struct sockaddr *" to new failover-by-IP function
2008-07-15 16:11:29 -04:00
Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
2008-07-23 18:24:08 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
2008-07-16 15:17:52 -07:00
MTD: handle pci_name() being const
2008-07-21 21:55:03 -07:00
netfilter: nfnetlink_log: send complete hardware header
2008-07-21 10:11:00 -07:00
md: Protect access to mddev->disks list using RCU
2008-07-21 17:05:25 +10:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
2008-07-22 13:13:47 -07:00
Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux
2008-07-20 21:21:46 -07:00
usb_serial: API all change
2008-07-22 13:03:22 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2008-07-16 17:25:46 -07:00
async_tx: remove depend_tx from async_tx_sync_epilog
2008-07-17 17:59:55 -07:00
execve filename: document and export via auxiliary vector
2008-07-22 09:59:40 -07:00
block: Trivial fix for blk_integrity_rq()
2008-07-16 14:51:41 -07:00
mm: unexport __alloc_bootmem_core()
2008-07-24 10:47:14 -07:00
configfs: Allow ->make_item() and ->make_group() to return detailed errors.
2008-07-17 15:21:29 -07:00
Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-23 19:36:53 -07:00
cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)
2008-07-18 13:22:25 +02:00
tty: add more tty_port fields
2008-07-20 17:12:38 -07:00
I/OAT: I/OAT version 3.0 support
2008-07-22 17:30:57 -07:00
debugfs: Implement debugfs_remove_recursive()
2008-07-21 21:54:59 -07:00
dm: introduce merge_bvec_fn
2008-07-21 12:00:37 +01:00
driver core: remove DEVICE_ID_SIZE define
2008-07-21 21:54:53 -07:00
dm: introduce merge_bvec_fn
2008-07-21 12:00:37 +01:00
powerpc/cell: Add DMA_ATTR_WEAK_ORDERING dma attribute and use in Cell IOMMU code
2008-07-22 10:39:36 +10:00
async_tx: make async_tx_test_ack a boolean routine
2008-07-17 17:59:56 -07:00
driver core: remove DEVICE_NAME_SIZE define
2008-07-21 21:54:53 -07:00
Freezer: Introduce PF_FREEZER_NOSIG
2008-07-16 23:27:03 +02:00
fix soft lock up at NFS mount via per-SB LRU-list of unused dentries
2008-07-24 10:47:15 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2008-07-22 19:09:51 -07:00
gianfar: Add magic packet and suspend/resume support.
2008-07-16 17:57:47 -05:00
gs: use tty_port
2008-07-20 17:12:36 -07:00
page allocator: inline some __alloc_pages() wrappers
2008-07-24 10:47:14 -07:00
esp: use tty_port
2008-07-20 17:12:36 -07:00
HID: add n-trig digitizer usage
2008-07-23 15:25:21 +02:00
V4L/DVB (8246): tvaudio: Stop I2C driver ID abuse
2008-07-20 07:18:38 -03:00
ide: remove unused PC_FLAG_DRQ_INTERRUPT
2008-07-23 19:56:01 +02:00
packet: add PACKET_RESERVE sockopt
2008-07-18 18:05:19 -07:00
ptrace children revamp
2008-07-16 18:02:33 -07:00
Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into next
2008-07-21 00:55:14 -04:00
Merge branch 'genirq' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-07-15 10:39:22 -07:00
PNP: support optional IRQ resources
2008-07-16 23:27:07 +02:00
ipv6: __KERNEL__ ifdef struct ipv6_devconf
2008-07-21 13:41:16 -07:00
istallion: use tty_port
2008-07-20 17:12:37 -07:00
remove CONFIG_KMOD from core kernel code
2008-07-22 19:24:31 +10:00
kobject: reorder kobject to save space on 64 bit builds
2008-07-21 21:54:56 -07:00
KVM: Support mixed endian machines
2008-07-20 12:42:32 +03:00
KVM: MMU: nuke shadowed pgtable pages and ptes on memslot destruction
2008-07-20 12:42:40 +03:00
mm: remove double indirection on tlb parameter to free_pgd_range() & Co
2008-07-24 10:47:15 -07:00
module: turn longs into ints for module sizes
2008-07-22 19:24:27 +10:00
net: Fix build failure with 'make mandocs'.
2008-07-22 14:09:06 -07:00
of_gpio: Should use new <linux/gpio.h> header
2008-07-22 10:39:30 +10:00
page-flags: record page flag overlays explicitly
2008-07-24 10:47:15 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2008-07-16 17:25:46 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
2008-07-23 12:03:18 -07:00
net_sched: Add size table for qdiscs
2008-07-20 00:08:47 -07:00
PNP: convert resource options to single linked list
2008-07-16 23:27:07 +02:00
netns: make get_proc_net() static
2008-07-22 14:19:19 -07:00
net_sched: Add size table for qdiscs
2008-07-20 00:08:47 -07:00
sg: reimplement sg mapping iterator
2008-07-23 14:42:09 +02:00
add a helper function to test if an object is on the stack
2008-07-24 10:47:14 -07:00
proc: consolidate per-net single-release callers
2008-07-18 04:07:44 -07:00
serial: use tty_port
2008-07-20 17:12:35 -07:00
net: Use standard structures for generic socket address structures.
2008-07-19 22:35:47 -07:00
stallion: use tty_port
2008-07-20 17:12:37 -07:00
move memory_read_from_buffer() from fs.h to string.h
2008-07-24 10:47:13 -07:00
synclink_gt: add serial bit order control
2008-07-22 13:03:29 -07:00
sysdev: Add utility functions for simple int/ulong variable sysdev attributes
2008-07-21 21:55:02 -07:00
driver core: Suppress sysfs warnings for device_rename().
2008-07-21 21:55:01 -07:00
tcp: Remove redundant checks when setting eff_sacks
2008-07-19 00:07:02 -07:00
tty: Split ldisc code into its own file
2008-07-22 13:03:27 -07:00
tty: rework break handling
2008-07-22 13:03:28 -07:00
tty: Ldisc revamp
2008-07-20 17:12:34 -07:00
UIO: minor style and comment fixes
2008-07-21 21:54:55 -07:00
USB: Force unbinding of drivers lacking reset_resume or other methods
2008-07-21 15:16:40 -07:00
USB: remove CVS keywords
2008-07-21 15:15:55 -07:00
V4L/DVB (8197): gspca: pac207 frames no more decoded in the subdriver.
2008-07-20 07:17:02 -03:00
mm/vmstat.c: proper externs
2008-07-24 10:47:14 -07:00
