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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 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
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 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
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 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-ks8695 [ARM] 4603/1: KS8695: debugfs interface to view pin state 2008-01-26 14:38:48 +00:00
arch-l7200 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
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 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
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 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
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 [ARM] 4216/1: add .gitignore entries for ARM specific files 2007-02-17 11:26:41 +00:00
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 [ARM] Improve csum_fold, cleanup csum_tcpudp_magic() 2007-02-06 16:46:46 +00:00
cnt32_to_63.h
cpu-multi32.h
cpu-single.h
cpu.h
cputime.h
current.h
delay.h
device.h [ARM] Add a reference from struct device to the dma bounce info 2007-02-12 10:28:24 +00:00
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 [ARM] 4127/1: Flush the prefetch buffer after changing the DACR 2007-02-08 14:49:18 +00:00
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 [PATCH] GPIO core 2007-02-12 09:48:34 -08:00
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 [ARM] 4073/1: Prevent s3c24xx drivers from including asm/arch/hardware.h and asm/arch/irqs.h 2006-12-30 17:05:07 +00:00
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 [PATCH] Remove the last reference to rwlock_is_locked() macro. 2007-02-11 10:51:34 -08:00
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 Storage class should be before const qualifier 2007-02-17 20:11:19 +01:00
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