Martin Schwidefsky 2f569afd9c CONFIG_HIGHPTE vs. sub-page page tables. ... Background: I've implemented 1K/2K page tables for s390. These sub-page page tables are required to properly support the s390 virtualization instruction with KVM. The SIE instruction requires that the page tables have 256 page table entries (pte) followed by 256 page status table entries (pgste). The pgstes are only required if the process is using the SIE instruction. The pgstes are updated by the hardware and by the hypervisor for a number of reasons, one of them is dirty and reference bit tracking. To avoid wasting memory the standard pte table allocation should return 1K/2K (31/64 bit) and 2K/4K if the process is using SIE. Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means the s390 version for pte_alloc_one cannot return a pointer to a struct page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one cannot return a pointer to a pte either, since that would require more than 32 bit for the return value of pte_alloc_one (and the pte * would not be accessible since its not kmapped). Solution: The only solution I found to this dilemma is a new typedef: a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a later patch. For everybody else it will be a (struct page *). The additional problem with the initialization of the ptl lock and the NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and a destructor pgtable_page_dtor. The page table allocation and free functions need to call these two whenever a page table page is allocated or freed. pmd_populate will get a pgtable_t instead of a struct page pointer. To get the pgtable_t back from a pmd entry that has been installed with pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page call in free_pte_range and apply_to_pte_range. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2008-02-08 09:22:42 -08:00
..
arch-aaec2000	Convert files to UTF-8 and some cleanups	2007-10-19 23:21:04 +02:00
arch-at91	[ARM] 4802/1: Fix typo and remove vague comment	2008-02-04 13:16:39 +00:00
arch-cl7500	[ARM] Use new get_irqnr_preamble	2007-05-12 15:25:50 +01:00
arch-clps711x
arch-davinci	[ARM] 4634/1: DaVinci GPIO header build fix	2007-10-31 15:21:52 +00:00
arch-ebsa110	[ARM] Use new get_irqnr_preamble	2007-05-12 15:25:50 +01:00
arch-ebsa285	[ARM] Use new get_irqnr_preamble	2007-05-12 15:25:50 +01:00
arch-ep93xx	[ARM] 4671/1: ep93xx: remove obsolete gpio_line_* operations	2008-01-26 14:37:31 +00:00
arch-h720x
arch-imx	imxfb: fast read flag and nonstandard field configurable	2007-10-16 09:43:21 -07:00
arch-integrator	[ARM] Remove Integrator/CP SMP platform support	2007-05-16 15:35:26 +01:00
arch-iop13xx	async_tx: replace 'int_en' with operation preparation flags	2008-02-06 10:12:18 -07:00
arch-iop32x	[ARM] 4476/1: EM7210/SS4000E support	2007-07-20 09:35:35 +01:00
arch-iop33x	iop3xx: surface the iop3xx DMA and AAU units to the iop-adma driver	2007-07-13 08:06:19 -07:00
arch-ixp4xx	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2008-02-04 15:29:53 -08:00
arch-ixp23xx	[ARM] 4680/1: parentheses around NR_IRQS definition	2007-11-29 20:56:57 +00:00
arch-ixp2000
arch-ks8695	[ARM] 4603/1: KS8695: debugfs interface to view pin state	2008-01-26 14:38:48 +00:00
arch-l7200
arch-lh7a40x	[ARM] 4248/1: lh7a40x: fix missing definitions for get_irqnr_preamble	2007-03-08 13:33:57 +00:00
arch-msm	[ARM] msm: dma support for MSM7X00A	2008-01-26 14:39:14 +00:00
arch-mxc	[ARM] 4530/1: MXC: fix elf_hwcap compile breakage as in iop13xx	2007-07-28 20:52:55 +01:00
arch-netx	[ARM] 4329/1: fix position of NETX_SYSTEM_REG	2007-05-03 20:22:49 +01:00
arch-ns9xxx	[ARM] 4595/1: ns9xxx: define registers as void __iomem * instead of volatile u32	2007-10-12 23:43:41 +01:00
arch-omap	[ALSA] Remove sound/driver.h	2008-01-31 17:29:48 +01:00
arch-orion	[ARM] Orion: MV88F5181 support bits	2008-01-26 15:03:55 +00:00
arch-pnx4008
arch-pxa	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2008-02-07 12:57:44 -08:00
arch-realview	[ARM] 4822/1: RealView: Change the REALVIEW_MPCORE configuration option	2008-02-04 17:52:28 +00:00
arch-rpc	[ARM] 4564/1: Add tagged list support for Acorn RiscPC's uncompress code	2007-10-12 23:43:11 +01:00
arch-s3c2400	[ARM] 4522/1: S3C: split include/asm-arm/arch/memory.h	2007-07-22 17:06:04 +01:00
arch-s3c2410	FB/S3C2412: add S3C2412 support to S3C2410 fb driver	2008-02-06 10:41:17 -08:00
arch-sa1100	[ARM] unbalanced parenthesis fix	2007-10-12 23:43:21 +01:00
arch-shark
arch-versatile	fix typo 'the same the\>'	2008-02-03 14:59:11 +02:00
hardware	async_tx: replace 'int_en' with operation preparation flags	2008-02-06 10:12:18 -07:00
mach	include/asm-arm/: Spelling fixes	2008-02-03 16:50:59 +02:00
plat-s3c	[ARM] 4632/1: Fix a typo in include/asm-arm/plat-s3c/regs-nand.h	2007-10-31 15:21:33 +00:00
plat-s3c24xx	[ARM] 4786/1: S3C2412: Add SPI FIFO controll constants	2008-01-28 13:20:51 +00:00
.gitignore
a.out-core.h	aout: suppress A.OUT library support if !CONFIG_ARCH_SUPPORTS_AOUT	2008-02-08 09:22:30 -08:00
a.out.h	aout: move STACK_TOP[_MAX] to asm/processor.h	2008-02-08 09:22:29 -08:00
assembler.h
atomic.h	atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency	2007-05-08 11:15:20 -07:00
auxvec.h
bitops.h	ext4: Add ext4_find_next_bit()	2008-01-28 23:58:27 -05:00
bug.h
bugs.h
byteorder.h
cache.h
cacheflush.h	[ARM] Marvell Feroceon CPU core support	2008-01-26 15:03:38 +00:00
checksum.h
cnt32_to_63.h
cpu-multi32.h
cpu-single.h
cpu.h
cputime.h
current.h
delay.h
device.h
div64.h	[NET]: div64_64 consolidate (rev3)	2007-04-25 22:23:33 -07:00
dma-mapping.h	arm: sg fallout	2007-10-23 12:37:59 +02:00
dma.h
domain.h
dyntick.h
ecard.h	[ARM] ecard: add ecardm_iomap() / ecardm_iounmap()	2007-05-11 17:19:02 +01:00
elf.h	Cleanup asm/{elf,page,user}.h: #ifdef __KERNEL__ is no longer needed	2008-02-07 08:42:30 -08:00
emergency-restart.h
errno.h
fb.h	fbdev: detect primary display device	2007-07-17 10:23:11 -07:00
fcntl.h
fiq.h
flat.h	[ARM] nommu: fix breakage caused by f9720205d1	2007-10-31 15:21:42 +00:00
floppy.h	cleanup floppy.h	2007-10-17 08:42:55 -07:00
fpstate.h	[ARM] 4583/1: ARMv7: Add VFPv3 support	2008-01-26 14:41:28 +00:00
futex.h
glue.h	[ARM] armv7: add support for ARMv7 cores.	2007-05-08 22:55:53 +01:00
gpio.h
hardirq.h
hardware.h
hw_irq.h
hwcap.h	[ARM] 4473/2: Take the HWCAP definitions out of the elf.h file	2007-07-12 16:20:15 +01:00
ide.h	ide: add CONFIG_IDE_ARCH_OBSOLETE_INIT	2007-10-20 00:32:32 +02:00
io.h	endianness annotations in arm io.h	2007-10-14 12:41:52 -07:00
ioctl.h
ioctls.h	[ARM] enable arbitary speed tty ioctls and split input/output speed	2007-05-28 23:07:34 +01:00
ipcbuf.h
irq_regs.h
irq.h
irqflags.h
Kbuild	[ARM] 4473/2: Take the HWCAP definitions out of the elf.h file	2007-07-12 16:20:15 +01:00
kdebug.h	move die notifier handling to common code	2007-05-08 11:15:04 -07:00
kexec.h	[ARM] 4736/1: Export atags to userspace and allow kexec to use customised atags	2008-02-04 13:21:03 +00:00
kmap_types.h
kprobes.h	ARM kprobes: special hook for the kprobes breakpoint handler	2008-01-26 15:25:17 +00:00
leds.h
limits.h
linkage.h	[ARM] VFP: fix section mismatch error	2007-06-10 12:22:20 +01:00
local.h
locks.h
mc146818rtc.h
memory.h
mman.h
mmu_context.h	[ARM] ARMv6: add CPU_HAS_ASID configuration	2007-05-17 10:19:23 +01:00
mmu.h	[ARM] ARMv6: add CPU_HAS_ASID configuration	2007-05-17 10:19:23 +01:00
mmzone.h
module.h
msgbuf.h
mtd-xip.h
mutex.h	misc: removal of final callers using fastcall	2008-02-08 09:22:31 -08:00
namei.h
nwflash.h
page-nommu.h
page.h	CONFIG_HIGHPTE vs. sub-page page tables.	2008-02-08 09:22:42 -08:00
param.h
parport.h
pci.h	[ARM] 4577/1: ITE 8152 PCI bridge support	2007-10-15 18:53:59 +01:00
percpu.h
pgalloc.h	CONFIG_HIGHPTE vs. sub-page page tables.	2008-02-08 09:22:42 -08:00
pgtable-hwdef.h
pgtable-nommu.h	[ARM] 4531/1: remove is_in_rom() protptype	2007-08-04 22:13:43 +01:00
pgtable.h	[ARM] 4644/2: fix flush_kern_tlb_range() in module space	2007-11-08 10:07:14 +00:00
poll.h	Consolidate asm/poll.h	2007-05-11 08:29:34 -07:00
posix_types.h	asm-*/posix_types.h: scrub __GLIBC__	2008-02-08 09:22:34 -08:00
proc-fns.h	[ARM] Marvell Feroceon CPU core support	2008-01-26 15:03:38 +00:00
processor.h	aout: move STACK_TOP[_MAX] to asm/processor.h	2008-02-08 09:22:29 -08:00
procinfo.h
ptrace.h	[ARM] 4474/1: Do not check the PSR_F_BIT in valid_user_regs	2007-07-12 16:20:52 +01:00
resource.h
rtc.h
scatterlist.h	Add CONFIG_DEBUG_SG sg validation	2007-10-22 21:20:03 +02:00
sections.h
segment.h
semaphore-helper.h
semaphore.h	kill DECLARE_MUTEX_LOCKED	2007-10-17 08:42:47 -07:00
sembuf.h
serial.h
setup.h	[ARM] use __used attribute	2007-05-30 13:15:06 +01:00
shmbuf.h
shmparam.h
sigcontext.h
siginfo.h
signal.h
sizes.h	[ARM] 4372/1: Define byte sizes in asm-arm/sizes.h	2007-05-11 21:07:58 +01:00
smp.h	[ARM] 4814/1: RealView: Add broadcasting clockevents support for ARM11MPCore	2008-02-04 17:52:19 +00:00
socket.h	[NET]: Introducing socket mark socket option.	2008-01-31 19:27:19 -08:00
sockios.h	[NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution	2007-04-25 22:24:04 -07:00
spinlock_types.h
spinlock.h
stat.h
statfs.h
string.h
suspend.h
system.h	Add cmpxchg_local to arm	2008-02-07 08:42:31 -08:00
termbits.h	[ARM] enable arbitary speed tty ioctls and split input/output speed	2007-05-28 23:07:34 +01:00
termios.h	[ARM] enable arbitary speed tty ioctls and split input/output speed	2007-05-28 23:07:34 +01:00
therm.h
thread_info.h	remove unused TIF_NOTIFY_RESUME flag	2007-07-31 15:39:38 -07:00
thread_notify.h
timex.h
tlb.h	add mm argument to pte/pmd/pud/pgd_free	2008-02-05 09:44:18 -08:00
tlbflush.h	remove unused flush_tlb_pgtables	2007-10-19 11:53:34 -07:00
topology.h
traps.h	ARM kprobes: prevent some functions involved with kprobes from being probed	2008-01-26 15:25:17 +00:00
types.h	remove strict ansi check from __u64 in asm/types.h	2007-10-17 08:42:53 -07:00
uaccess.h
ucontext.h
unaligned.h	arm unaligned.h annotations	2007-07-26 11:11:57 -07:00
unistd.h	[ARM] Add fallocate syscall entry	2007-10-12 23:43:31 +01:00
user.h	Sanitize the type of struct user.u_ar0	2008-02-07 08:42:30 -08:00
vfp.h	[ARM] 4583/1: ARMv7: Add VFPv3 support	2008-01-26 14:41:28 +00:00
vfpmacros.h	[ARM] 4583/1: ARMv7: Add VFPv3 support	2008-01-26 14:41:28 +00:00
vga.h
xor.h