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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
..
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
agp.h x86: remove flush_agp_mappings() 2008-01-30 13:34:07 +01:00
apb.h
asi.h
atomic.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
auxio.h
auxvec.h
backoff.h [SPARC64]: Fix BACKOFF_SPIN on non-SMP. 2007-10-27 00:23:22 -07:00
bbc.h
bitops.h forbid asm/bitops.h direct inclusion 2007-10-19 11:53:41 -07:00
bpp.h
bsderrno.h
bug.h
bugs.h [SPARC64]: More sensible udelay implementation. 2007-07-16 04:05:02 -07:00
byteorder.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
cache.h [PATCH] Move read_mostly definition to asm/cache.h 2006-03-23 07:38:10 -08:00
cacheflush.h [PATCH] Optimize D-cache alias handling on fork 2006-12-13 09:27:08 -08:00
chafsr.h
checksum.h [NET]: SPARC64 checksum annotations and cleanups. 2006-12-02 21:23:23 -08:00
chmctrl.h
cmt.h
compat_signal.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
compat.h asm-*/compat.h: fix typo in comment 2008-02-03 16:32:51 +02:00
cpudata.h [SPARC64]: Access ivector_table[] using physical addresses. 2007-10-13 21:53:15 -07:00
cputime.h
current.h
dcr.h
dcu.h
delay.h [SPARC64]: More sensible udelay implementation. 2007-07-16 04:05:02 -07:00
device.h [SPARC64]: Fix several bugs in MSI handling. 2007-08-30 23:06:51 -07:00
display7seg.h
div64.h
dma-mapping.h [SPARC64]: Fix OOPS in dma_sync_*_for_device() 2007-12-20 01:29:45 -08:00
dma.h [SPARC64]: Fix floppy build failure. 2007-03-05 13:22:28 -08:00
ebus.h [SPARC64] ebus: Convert to use pci_device_to_OF_node(). 2007-04-26 01:55:04 -07:00
elf.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2008-02-07 10:21:26 -08:00
emergency-restart.h
envctrl.h
errno.h
estate.h
fb.h [SPARC]: Implement fb_is_primary_device(). 2007-07-20 17:15:09 -07:00
fbio.h [SPARC]: Mark SBUS framebuffer ioctls as IGNORE in compat_ioctl.c 2007-07-30 00:27:36 -07:00
fcntl.h [SPARC]: Fix O_CLOEXEC values. 2007-08-03 14:24:17 -07:00
fhc.h [SPARC64]: Convert central bus layer to in-kernel PROM device tree. 2006-06-23 23:15:32 -07:00
floppy.h cleanup floppy.h 2007-10-17 08:42:55 -07:00
fpumacro.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
futex.h [SPARC64]: Fix linkage of enormous kernels. 2007-10-31 15:30:56 -07:00
hardirq.h [SPARC64]: Move over to GENERIC_HARDIRQS. 2006-06-20 01:23:32 -07:00
head.h
hvtramp.h [SPARC64]: Initial LDOM cpu hotplug support. 2007-07-16 04:04:40 -07:00
hw_irq.h [SPARC64]: Minor irq handling cleanups. 2006-12-17 14:06:56 -08:00
hypervisor.h [SPARC64]: Fix two kernel linear mapping setup bugs. 2007-12-13 06:13:38 -08:00
ide.h ide: add CONFIG_IDE_ARCH_OBSOLETE_INIT 2007-10-20 00:32:32 +02:00
idprom.h
intr_queue.h
io.h [SPARC64]: Temporarily remove IOMMU merging code. 2008-02-06 04:12:25 -08:00
ioctl.h
ioctls.h [SPARC]: Support for new termios. 2007-10-17 19:38:10 -07:00
iommu.h [SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling. 2007-07-30 00:27:34 -07:00
ipcbuf.h
irq_regs.h [PATCH] sparc64 pt_regs fixes 2006-10-08 12:32:35 -07:00
irq.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
irqflags.h [SPARC64]: Add irqtrace/stacktrace/lockdep support. 2006-12-10 02:39:09 -08:00
isa.h [SPARC64] isa: Convert to use pci_device_to_OF_node(). 2007-04-26 01:55:05 -07:00
Kbuild remove include/asm-*/ipc.h 2007-10-17 08:42:55 -07:00
kdebug.h x86: optimize page faults like all other achitectures and kill notifier cruft 2007-10-16 09:42:50 -07:00
kmap_types.h
kprobes.h kprobes: support kretprobe blacklist 2007-10-16 09:43:10 -07:00
ldc.h [SPARC64]: Fix build regressions added by dr-cpu changes. 2007-07-16 04:04:49 -07:00
linkage.h
local.h local_t: sparc64 cleanup 2007-05-08 11:15:20 -07:00
lsu.h consolidate asm/const.h to linux/const.h 2007-05-08 11:15:13 -07:00
mc146818rtc.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
mdesc.h [SPARC64]: Add basic infrastructure for MD add/remove notification. 2007-07-18 01:19:51 -07:00
mman.h [PATCH] IA64,sparc: local DoS with corrupted ELFs 2006-09-08 08:40:46 -07:00
mmu_context.h [SPARC64]: dr-cpu unconfigure support. 2007-07-16 04:05:32 -07:00
mmu.h consolidate asm/const.h to linux/const.h 2007-05-08 11:15:13 -07:00
module.h
mostek.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
msgbuf.h
mutex.h
namei.h
ns87303.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
numnodes.h
of_device.h Create linux/of_platorm.h 2007-07-20 14:25:22 +10:00
of_platform.h [SPARC/64]: Consolidate of_register_driver 2007-10-17 21:17:42 -07:00
openprom.h [SPARC64]: Bump PROMINTR_MAX to 32. 2007-05-10 00:55:59 -07:00
openpromio.h
oplib.h [SPARC64]: Fix lockdep, particularly on SMP. 2007-09-16 11:51:15 -07:00
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
param.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
parport.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
pci.h [SPARC64]: Implement pci_resource_to_user() 2007-12-26 19:33:46 -08:00
pconf.h
percpu.h SPARC64: use generic percpu 2008-01-30 23:27:58 +01:00
perfctr.h
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable.h SPARC64: SPARSEMEM_VMEMMAP support 2007-10-16 09:42:51 -07:00
pil.h [SPARC64]: Send all device interrupts via one PIL. 2006-06-20 01:20:00 -07:00
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
processor.h aout: remove unnecessary inclusions of {asm, linux}/a.out.h 2008-02-08 09:22:30 -08:00
prom.h [SPARC]: Centralize find_in_proplist() instead of duplicating N times. 2007-08-07 18:46:36 -07:00
psrcompat.h
pstate.h consolidate asm/const.h to linux/const.h 2007-05-08 11:15:13 -07:00
ptrace.h [SPARC]: Move over to arch_ptrace(). 2008-02-07 03:00:17 -08:00
reg.h
resource.h
rtc.h
rwsem-const.h
rwsem.h [SPARC64]: Add irqtrace/stacktrace/lockdep support. 2006-12-10 02:39:09 -08:00
sbus.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
scratchpad.h
seccomp.h
sections.h
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h
setup.h [SPARC64]: Increase command line size to 2048 like other arches. 2007-02-12 15:15:47 -08:00
sfafsr.h consolidate asm/const.h to linux/const.h 2007-05-08 11:15:13 -07:00
sfp-machine.h [MATH-EMU]: Fix underflow exception reporting. 2007-08-16 22:59:49 -07:00
shmbuf.h
shmparam.h unexport asm/shmparam.h 2007-10-17 08:42:47 -07:00
sigcontext.h
siginfo.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
signal.h [SPARC64]: Do not include compat.h from asm-sparc64/signal.h any more. 2006-10-02 14:30:45 -07:00
smp.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
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
solerrno.h
sparsemem.h [SPARC64]: MAX_PHYSADDR_BITS et al. really need to be 42 bits not 41. 2007-04-26 01:55:24 -07:00
spinlock_types.h
spinlock.h [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
spitfire.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
sstate.h [SPARC64]: Report proper system soft state to the hypervisor. 2007-05-29 02:49:29 -07:00
starfire.h [SPARC64]: Kill starfire_cookie from SBUS/PCI. 2006-06-29 16:37:08 -07:00
stat.h
statfs.h
string.h
sunbpp.h
svr4.h
system.h Add cmpxchg_local to sparc64 2008-02-07 08:42:33 -08:00
termbits.h [SPARC]: Support for new termios. 2007-10-17 19:38:10 -07:00
termios.h [SPARC]: Support for new termios. 2007-10-17 19:38:10 -07:00
thread_info.h [SPARC64]: Eliminate NR_CPUS limitations. 2007-05-29 02:49:49 -07:00
timer.h [SPARC64]: Add clocksource/clockevents support. 2007-04-26 01:54:15 -07:00
timex.h read_current_timer() cleanups 2008-02-06 10:41:02 -08:00
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 Convert cpu_sibling_map to be a per cpu variable 2007-10-16 09:42:50 -07:00
tsb.h [SPARC64]: Fix two bugs wrt. kernel 4MB TSB. 2007-05-29 02:51:38 -07:00
ttable.h [SPARC64]: Unify timer interrupt handler. 2007-04-26 01:54:11 -07:00
types.h
uaccess.h aout: remove unnecessary inclusions of {asm, linux}/a.out.h 2008-02-08 09:22:30 -08:00
uctx.h
unaligned.h
unistd.h [SPARC]: Add new timerfd syscall entries. 2008-02-06 04:12:23 -08:00
upa.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
user.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
utrap.h
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
vio.h [SPARC64]: Use "is_power_of_2" macro for simplicity. 2007-11-07 02:24:33 -08:00
visasm.h [SPARC64]: __inline__ --> inline 2007-10-27 00:13:04 -07:00
watchdog.h
xor.h [SPARC64]: Do not assume sun4v chips have load-twin/store-init support. 2007-08-08 17:33:45 -07:00