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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
..
Kbuild [S390] Unexport <asm/z90crypt.h>, export <asm/zcrypt.h> in its place. 2006-09-24 22:07:25 +01:00
a.out.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
airq.h [S390] cio: Extend adapter interrupt interface. 2008-01-26 14:11:00 +01:00
appldata.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
atomic.h [S390] Change atomic_read/set to inline functions with barrier semantics. 2007-08-22 13:51:49 +02:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [S390] Implement ext2_find_next_bit. 2008-02-05 16:50:58 +01:00
bug.h Fix WARN_ON() on bitfield ops for all other archs 2007-08-01 20:45:38 -07:00
bugs.h [S390] check_bugs() should be inline. 2007-03-05 23:35:50 +01:00
byteorder.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
cache.h [S390] Get rid of ARCH_KMALLOC_MINALIGN. 2007-10-12 16:13:07 +02:00
cacheflush.h [S390] DEBUG_PAGEALLOC support for s390. 2008-02-05 16:50:54 +01:00
ccwdev.h [S390] cio: Introduce ccw_bus_type.shutdown. 2007-10-12 16:13:01 +02:00
ccwgroup.h [S390] cio: Add shutdown callback for ccwgroup. 2008-02-05 16:50:54 +01:00
checksum.h [S390] Fix TCP/UDP pseudo header checksum computation. 2007-03-26 20:43:46 +02:00
chpid.h [S390] cio: Channel-path configure function. 2007-04-27 16:01:39 +02:00
cio.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
cmb.h [S390] cio: Kerneldoc comments for cmf. 2007-10-12 16:12:59 +02:00
compat.h asm-*/compat.h: fix typo in comment 2008-02-03 16:32:51 +02:00
cpcmd.h [S390] cpcmd <-> __cpcmd calling issues 2006-12-04 15:40:30 +01:00
cpu.h [S390] Add per-cpu idle time / idle count sysfs attributes. 2007-10-22 12:52:47 +02:00
cputime.h taskstats scaled time cleanup 2008-02-06 10:41:00 -08:00
current.h
…
dasd.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
debug.h [PATCH] Fix 'make headers_check' on s390 2006-09-16 12:54:31 -07:00
delay.h
…
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
diag.h [S390] vmur: fix diag14 exceptions with addresses > 2GB. 2007-08-22 13:51:47 +02:00
div64.h [S390] __div64_32 for 31 bit. 2006-09-28 16:55:39 +02:00
dma.h [S390] empty function defines. 2006-09-20 15:58:51 +02:00
ebcdic.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
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 [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno.h
…
etr.h [S390] ETR support. 2007-02-05 21:18:19 +01:00
extmem.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
futex.h [S390] don't call handle_mm_fault() if in an atomic context. 2007-01-09 10:18:50 +01:00
hardirq.h [S390] ETR support. 2007-02-05 21:18:19 +01:00
idals.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
io.h [S390] remove __io_virt and mmiowb. 2007-02-12 15:49:57 +01:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
ipcbuf.h
…
ipl.h [S390] Use diag308 subcodes 3 and 6 for reboot and dump when possible. 2008-01-26 14:11:24 +01:00
irq.h [PATCH] Make touch_nmi_watchdog imply touch_softlockup_watchdog on all archs 2006-09-29 09:18:05 -07:00
irq_regs.h [S390] irq change build fixes. 2006-10-06 16:38:35 +02:00
irqflags.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
kdebug.h x86: optimize page faults like all other achitectures and kill notifier cruft 2007-10-16 09:42:50 -07:00
kexec.h Unexport asm/page.h 2008-02-07 08:42:30 -08:00
kmap_types.h
…
kprobes.h kprobes: support kretprobe blacklist 2007-10-16 09:43:10 -07:00
linkage.h
…
local.h [S390] local_t cleanup : use asm-generic/local.h. 2007-02-21 10:55:55 +01:00
lowcore.h [S390] add hardware capability support (ELF_HWCAP). 2007-05-04 18:48:35 +02:00
mathemu.h
…
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu.h
…
mmu_context.h [S390] Fix tlb flushing with idte. 2008-01-26 14:11:10 +01:00
module.h
…
monwriter.h [S390] Linux API for writing z/VM APPLDATA Monitor records. 2006-09-20 15:59:34 +02:00
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 [S390] Kconfig: use common Kconfig files for s390. 2007-05-10 15:46:08 +02:00
pci.h
…
percpu.h s390: use generic percpu linux-2.6.git 2008-01-30 23:27:58 +01:00
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable.h [S390] Remove BUILD_BUG_ON() in vmem code. 2008-02-05 16:51:01 +01:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
posix_types.h [PATCH] FD_ZERO build fix 2007-01-11 18:18:22 -08:00
processor.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
ptrace.h [S390] single-step cleanup 2008-01-26 14:11:27 +01:00
qdio.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
qeth.h
…
reset.h [S390] Convert memory detection into C code. 2007-02-05 21:18:37 +01:00
resource.h
…
rwsem.h [S390] Use new style spinlock initializer in __RWSEM_INITIALIZER. 2008-01-26 14:11:15 +01:00
s390_ext.h [S390] remove packed attribute from ext_int_info_t. 2007-10-12 16:13:07 +02:00
s390_rdev.h [PATCH] s390: email-address change 2006-01-14 18:27:10 -08:00
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
sclp.h [S390] Get rid of additional_cpus kernel parameter. 2008-01-26 14:11:15 +01:00
sections.h [S390] nss: Free unused memory in kernel image. 2007-02-21 10:55:37 +01:00
segment.h
…
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h
…
setup.h [S390] zfcpdump support. 2007-04-27 16:01:44 +02:00
sfp-machine.h [S390] Bogomips calculation for 64 bit. 2007-07-10 11:24:47 +02:00
sfp-util.h [S390] Bogomips calculation for 64 bit. 2007-07-10 11:24:47 +02:00
shmbuf.h
…
shmparam.h
…
sigcontext.h [PATCH] s390: sigcontext.h vs __user 2006-01-14 18:27:08 -08:00
siginfo.h
…
signal.h [PATCH] irq-flags: S390: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
sigp.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
smp.h [S390] add smp_call_function_mask 2008-01-26 14:11:31 +01:00
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.h [S390] do local_irq_restore while spinning in spin_lock_irqsave. 2008-01-26 14:11:31 +01:00
spinlock_types.h [S390] Remove owner_pc member from raw_spinlock_t. 2008-01-26 14:11:14 +01:00
stat.h
…
statfs.h
…
string.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
suspend.h
…
system.h Add cmpxchg_local to s390 2008-02-07 08:42:32 -08:00
tape390.h [S390] Add crypto support for 3592 tape devices 2007-02-05 21:18:26 +01:00
termbits.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
termios.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
thread_info.h [S390] preempt_count initialization. 2006-06-29 15:02:47 +02:00
timer.h [S390] Get rid of a lot of sparse warnings. 2007-02-05 21:16:47 +01:00
timex.h [S390] Support for s390 Pseudo Random Number Generator 2007-02-05 21:18:22 +01:00
tlb.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
tlbflush.h [S390] Avoid warnings in tlblush.h 2008-01-26 14:11:11 +01:00
todclk.h
…
topology.h
…
types.h remove strict ansi check from __u64 in asm/types.h 2007-10-17 08:42:53 -07:00
uaccess.h [S390] noexec protection 2007-02-05 21:18:17 +01:00
ucontext.h
…
unaligned.h
…
unistd.h [S390] Wire up sys_fallocate. 2007-07-27 12:29:19 +02:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
vtoc.h Use __uXX types for S390 DASD volume label definitions which are user-visible 2006-05-04 01:18:33 +01:00
xor.h
…
zcrypt.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00