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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
..
cpu-sh2 rtc: rtc-sh: Split out the CPU defs to asm/cpu/. 2008-01-28 13:18:58 +09:00
cpu-sh2a rtc: rtc-sh: Split out the CPU defs to asm/cpu/. 2008-01-28 13:18:58 +09:00
cpu-sh3 sh: sh7712 clock support 2008-01-28 13:19:02 +09:00
cpu-sh4 sh: Add support for SH7763 CPU subtype. 2008-01-28 13:19:02 +09:00
cpu-sh5 sh: comment tidying for sh64->sh migration. 2008-01-28 13:18:58 +09:00
dreamcast sh: Add maple bus support for the SEGA Dreamcast. 2007-09-21 15:55:55 +09:00
hd64465 fix file specification in comments 2006-10-03 23:01:26 +02:00
landisk sh: landisk: Header cleanups. 2007-05-14 09:18:35 +09:00
mpc1211 i386/x86_64: move headers to include/asm-x86 2007-10-11 11:20:03 +02:00
sh03 sh: intc - remove redundant irq code for sh03, snapgear and titan 2007-09-21 11:57:47 +09:00
.gitignore sh: Initial gitignore list 2006-10-03 13:16:15 +09:00
a.out.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
adc.h
addrspace.h sh: Clean up places that make 29-bit physical assumptions. 2008-01-28 13:18:59 +09:00
atomic-grb.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
atomic-irq.h sh: Split out atomic ops logically. 2006-12-12 08:42:08 +09:00
atomic-llsc.h sh: Split out atomic ops logically. 2006-12-12 08:42:08 +09:00
atomic.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
auxvec.h sh: Provide the FPSCR init through AT_FPUCW. 2008-01-28 13:19:00 +09:00
bitops-grb.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
bitops-irq.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
bitops.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
bug.h sh: Fix up generic BUG build for SH-5. 2008-01-28 13:18:52 +09:00
bugs.h sh: Add support for SH7763 CPU subtype. 2008-01-28 13:19:02 +09:00
byteorder.h sh: SH-5 byteorder routines. 2008-01-28 13:18:41 +09:00
cache.h sh: Split out cache status bits per-CPU family. 2008-01-28 13:18:38 +09:00
cacheflush.h sh: Fix argument page dcache flushing regression. 2008-01-07 13:50:18 +09:00
checksum_32.h sh: Split out checksum.h in to _32 and _64 variants. 2008-01-28 13:18:45 +09:00
checksum_64.h sh: comment tidying for sh64->sh migration. 2008-01-28 13:18:58 +09:00
checksum.h sh: Split out checksum.h in to _32 and _64 variants. 2008-01-28 13:18:45 +09:00
clock.h sh: Implement clk_round_rate() in the clock framework. 2007-07-20 13:29:09 +09:00
cmpxchg-grb.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
cmpxchg-irq.h sh: GUSA atomic rollback support. 2008-01-28 13:18:58 +09:00
cpu-features.h sh: Add 32-bit opcode feature CPU flag. 2007-05-09 01:35:01 +00:00
cputime.h
current.h
delay.h Fix __const_udelay declaration and definition mismatches 2008-02-06 10:41:06 -08:00
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
div64.h
dma-mapping.h sh: declared coherent memory support V2 2008-01-28 13:19:04 +09:00
dma.h sh: dma: Fix CONFIG_SYSFS=n build. 2007-09-21 11:57:53 +09:00
dmabrg.h sh: SH7760 DMABRG support. 2007-05-09 17:36:15 +09:00
edosk7705.h fix file specification in comments 2007-05-09 08:58:16 +02:00
elf.h sh: Kill off superfluous __KERNEL__ check in asm/elf.h. 2008-01-28 13:19:00 +09:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
entry-macros.S sh: Fixup various PAGE_SIZE == 4096 assumptions. 2006-12-06 10:45:39 +09:00
errno.h
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h [PATCH] Clean up struct flock64 definitions 2005-09-07 16:57:38 -07:00
fixmap.h sh: Preparation for uncached jumps through PMB. 2008-01-28 13:18:59 +09:00
flat.h sh: Fix up binfmt_flat compile warnings. 2008-01-28 13:19:00 +09:00
floppy.h Remove dma_cache_(wback|inv|wback_inv) functions 2007-10-17 08:42:57 -07:00
fpu.h sh: SH-2A FPU support. 2008-01-28 13:18:57 +09:00
freq.h [PATCH] sh: Simplistic clock framework 2006-01-16 23:15:28 -08:00
futex-irq.h sh: Fix up futex implementation. 2007-06-18 13:58:32 +09:00
futex.h sh: Fix up futex implementation. 2007-06-18 13:58:32 +09:00
gpio.h sh: Add gpio.h stubs for PFC definitions. 2007-09-21 11:57:49 +09:00
hardirq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
hd64461.h sh: include/asm-sh/: Spelling fixes. 2008-01-28 13:19:01 +09:00
heartbeat.h sh: heartbeat driver update. 2007-09-21 11:57:51 +09:00
hp6xx.h sh: Trivial fix for hp6xx build. 2007-03-28 19:45:59 +09:00
hw_irq.h sh: intc - remove default interrupt priority tables 2008-01-28 13:19:02 +09:00
ide.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ilsel.h sh: x3proto: ILSEL IRQ support. 2007-09-21 11:57:48 +09:00
io_generic.h [PATCH] sh: I/O routine cleanups and ioremap() overhaul 2006-01-16 23:15:28 -08:00
io.h sh: Clean up places that make 29-bit physical assumptions. 2008-01-28 13:18:59 +09:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h sh: Convert struct ioctls to static defines. 2007-03-12 16:12:45 +09:00
ipcbuf.h
irq_regs.h sh: Updates for IRQ handler changes. 2006-10-06 15:31:16 +09:00
irq.h sh: Decouple 4k and soft/hardirq stacks. 2007-11-02 12:16:51 +09:00
irqflags_32.h sh: Split out irqflags.h in to _32 and _64 variants. 2008-01-28 13:18:40 +09:00
irqflags_64.h sh: Split out irqflags.h in to _32 and _64 variants. 2008-01-28 13:18:40 +09:00
irqflags.h sh: Split out irqflags.h in to _32 and _64 variants. 2008-01-28 13:18:40 +09:00
Kbuild sh: Fix posix_types.h userspace breakage from sh64 merge. 2008-01-28 13:19:02 +09:00
kdebug.h x86: optimize page faults like all other achitectures and kill notifier cruft 2007-10-16 09:42:50 -07:00
kexec.h kdump/kexec: calculate note size at compile time 2007-05-08 11:15:07 -07:00
keyboard.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
kgdb.h sh: Make kgdb i-cache flushing less inept. 2007-10-03 17:21:10 +09:00
kmap_types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
lboxre2.h sh: Tidy up L-BOX area5 addresses. 2007-05-07 02:11:55 +00:00
linkage.h
local.h
machvec.h remove __attribute_used__ 2008-01-28 23:21:18 +01:00
magicpanelr2.h sh: Magic Panel R2 board support. 2007-09-21 11:57:54 +09:00
mc146818rtc.h sh: Kill off the rest of the legacy rtc mess. 2006-09-27 17:45:01 +09:00
microdev.h sh: include/asm-sh/: Spelling fixes. 2008-01-28 13:19:01 +09:00
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu_context_32.h sh: Move in the SH-5 mmu_context headers. 2008-01-28 13:18:41 +09:00
mmu_context_64.h sh: Move in the SH-5 mmu_context headers. 2008-01-28 13:18:41 +09:00
mmu_context.h sh: Move in the SH-5 mmu_context headers. 2008-01-28 13:18:41 +09:00
mmu.h sh: Use a per-cpu ASID cache. 2007-02-13 10:54:45 +09:00
mmzone.h sh: Support for multiple nodes. 2007-06-08 02:43:49 +00:00
module.h sh: Add SH-5 support to asm/module.h. 2008-01-28 13:18:39 +09:00
msgbuf.h
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
param.h sh: Always use CONFIG_HZ for HZ. 2008-01-28 13:19:01 +09:00
parport.h sh: Add parport stub for SuperIO ports. 2007-07-07 07:28:11 +09:00
pci.h sh: Get the SH-5 PCI support building. 2008-01-28 13:18:55 +09:00
percpu.h
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable_32.h sh: Document PTEL 31:29 use on PTEA-wielding parts. 2008-01-28 13:18:59 +09:00
pgtable_64.h sh: comment tidying for sh64->sh migration. 2008-01-28 13:18:58 +09:00
pgtable.h sh: Stub in page_table_range_init() on nommu. 2008-01-28 13:19:00 +09:00
pm.h sh: APM/PM support. 2006-09-27 16:20:22 +09:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
posix_types_32.h sh: Fix posix_types.h userspace breakage from sh64 merge. 2008-01-28 13:19:02 +09:00
posix_types_64.h sh: Fix posix_types.h userspace breakage from sh64 merge. 2008-01-28 13:19:02 +09:00
posix_types.h sh: Fix posix_types.h userspace breakage from sh64 merge. 2008-01-28 13:19:02 +09:00
processor_32.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
processor_64.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
processor.h sh: Add support for SH7763 CPU subtype. 2008-01-28 13:19:02 +09:00
ptrace.h sh: Share bug/debug traps across _32 and _64. 2008-01-28 13:18:50 +09:00
push-switch.h sh: push-switch fixups for work_struct API damage. 2006-12-12 08:42:07 +09:00
r7780rp.h sh: update r7780rp interrupt code 2008-01-28 16:24:01 +09:00
resource.h
rtc.h rtc: rtc-sh: Split out the CPU defs to asm/cpu/. 2008-01-28 13:18:58 +09:00
rts7751r2d.h sh: intc - convert board specific r2d code 2007-09-21 11:57:50 +09:00
rwsem.h sh: Warn against direct inclusion of <asm/rwsem.h>. 2007-06-08 11:56:31 +09:00
scatterlist.h sh: Kill off pgtable.h from scatterlist.h. 2008-01-28 13:19:00 +09:00
sci.h serial: Add SERIAL_SH_SCI_NR_UARTS for sh-sci. 2006-09-27 17:32:30 +09:00
sdk7780.h sh: Add support for SDK7780 board. 2008-01-28 13:19:04 +09:00
se7206.h sh: SE7206 build fixes. 2006-12-06 10:45:37 +09:00
se7343.h sh: Solution Engine SH7343 board support. 2006-09-27 18:09:34 +09:00
se7722.h sh: clean up interrupt code for solution engine 7722 board 2007-07-20 12:18:20 +09:00
se7751.h Fix misspellings of "system", "controller", "interrupt" and "necessary". 2007-10-19 23:10:43 +02:00
se7780.h sh: SH7780 Solution Engine board support. 2007-05-07 02:11:55 +00:00
se.h sh: Solution Engine SH7705 board and CPU updates. 2007-05-07 02:11:56 +00:00
sections.h sh: Preparation for uncached jumps through PMB. 2008-01-28 13:18:59 +09:00
segment.h
semaphore-helper.h
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h
serial.h sh: rts7751r2d board updates. 2007-02-15 18:20:52 +09:00
setup.h sh: Move zero page param defs somewhere sensible. 2007-10-30 17:32:08 +09:00
sfp-machine.h sh: Kill off remaining config.h references. 2006-10-03 13:19:02 +09:00
sh_bios.h
shmbuf.h
shmin.h sh: Add some missing board headers. 2006-10-19 17:31:22 +09:00
shmparam.h sh: Fixup SHMLBA definition for SH7705. 2006-09-27 15:29:18 +09:00
sigcontext.h sh: SH-2A FPU support. 2008-01-28 13:18:57 +09:00
siginfo.h
signal.h [PATCH] irq-flags: SH: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
smc37c93x.h sh: Move smc37c93x.h for SystemH board use. 2006-09-27 11:16:20 +09:00
smp.h sh: Bring SMP support back from the dead. 2007-09-21 18:32:32 +09:00
snapgear.h sh: intc - remove redundant irq code for sh03, snapgear and titan 2007-09-21 11:57:47 +09:00
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
sparsemem.h sh: sparsemem support. 2007-06-08 02:43:43 +00:00
spi.h sh: add spi header and r2d platform data V3 2008-01-28 16:24:46 +09:00
spinlock_types.h sh: Overhaul spinlocks and rwlocks for SH-4A SMP. 2007-09-21 11:57:51 +09:00
spinlock.h sh: Overhaul spinlocks and rwlocks for SH-4A SMP. 2007-09-21 11:57:51 +09:00
stat.h sh: Special layout for SH-5 stat.h and user.h. 2008-01-28 13:18:53 +09:00
statfs.h
string_32.h sh: Split out asm/string.h for sh32 and sh64. 2008-01-28 13:18:40 +09:00
string_64.h sh: comment tidying for sh64->sh migration. 2008-01-28 13:18:58 +09:00
string.h sh: Split out asm/string.h for sh32 and sh64. 2008-01-28 13:18:40 +09:00
system_32.h sh: Fix up switch_to() type casts. 2008-01-28 13:19:00 +09:00
system_64.h sh: Preparation for uncached jumps through PMB. 2008-01-28 13:18:59 +09:00
system.h sh: Provide the FPSCR init through AT_FPUCW. 2008-01-28 13:19:00 +09:00
systemh7751.h Fix misspellings of "system", "controller", "interrupt" and "necessary". 2007-10-19 23:10:43 +02:00
termbits.h lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
termios.h [PATCH] consolidate line discipline number definitions 2007-02-11 10:51:26 -08:00
thread_info.h remove __attribute_used__ 2008-01-28 23:21:18 +01:00
timer.h sh: clockevent/clocksource/hrtimers/nohz TMU support. 2007-05-09 17:33:24 +09:00
timex.h
titan.h sh: sh775x/titan fixes for irq header changes. 2006-12-06 12:05:02 +09:00
tlb_64.h sh: Move over the SH-5 head.S and tlb.h. 2008-01-28 13:18:44 +09:00
tlb.h sh: Move over the SH-5 head.S and tlb.h. 2008-01-28 13:18:44 +09:00
tlbflush.h remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
topology.h sh: Support for multiple nodes. 2007-06-08 02:43:49 +00:00
types.h sh: Share bug/debug traps across _32 and _64. 2008-01-28 13:18:50 +09:00
uaccess_32.h sh: Fix get_user()/put_user() build error. 2008-01-28 13:19:02 +09:00
uaccess_64.h sh: comment tidying for sh64->sh migration. 2008-01-28 13:18:58 +09:00
uaccess.h sh: Split out uaccess.h in to _32 and _64 variants. 2008-01-28 13:18:42 +09:00
ubc.h sh: remove support for sh7300 and solution engine 7300 2007-07-26 15:37:57 +09:00
ucontext.h
unaligned.h
unistd_32.h timerfd: fix remaining architectures 2008-02-05 14:37:15 -08:00
unistd_64.h timerfd: fix remaining architectures 2008-02-05 14:37:15 -08:00
unistd.h sh: Split out syscall ABI for _32 and _64 variants. 2008-01-28 13:18:45 +09:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
vga.h sh: Add a dummy vga.h. 2007-11-07 20:19:30 +09:00
watchdog.h sh: Various cosmetic cleanups. 2006-09-27 12:31:01 +09:00
xor.h