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
adb_iop.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
amigahw.h	[PATCH] m68k: namespace pollution fix (custom->amiga_custom)	2006-01-12 09:09:00 -08:00
amigaints.h	[PATCH] m68k: convert amiga irq code	2006-06-25 10:00:57 -07:00
amigayle.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
amipcmcia.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
apollodma.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
apollohw.h	[PATCH] m68k: convert apollo irq code	2006-06-25 10:00:57 -07:00
atafd.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
atafdreg.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
atari_joystick.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
atari_stdma.h	IRQ: Use the new typedef for interrupt handler function pointers	2006-10-09 12:19:47 +01:00
atari_stram.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
atarihw.h	further UTF-8 fixes and name correction	2007-05-11 19:09:46 +02:00
atariints.h	further UTF-8 fixes and name correction	2007-05-11 19:09:46 +02:00
atarikb.h	m68k: Atari keyboard and mouse support.	2007-05-04 17:59:05 -07:00
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	[PATCH] auxiliary vector cleanups	2005-09-07 16:57:21 -07:00
bitops.h	ext4: Add ext4_find_next_bit()	2008-01-28 23:58:27 -05:00
blinken.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
bootinfo.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
bug.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
bugs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
bvme6000hw.h	[PATCH] m68k: convert VME irq code	2006-06-25 10:00:58 -07:00
byteorder.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
cache.h	[PATCH] Kill L1_CACHE_SHIFT_MAX	2006-01-08 20:13:39 -08:00
cachectl.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
cacheflush.h	[PATCH] Optimize D-cache alias handling on fork	2006-12-13 09:27:08 -08:00
checksum.h	[NET]: M68K checksum annotations and cleanups.	2006-12-02 21:23:07 -08:00
contregs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
cputime.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
current.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
delay.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
device.h	Driver core: add dev_archdata to struct device	2006-12-01 14:52:01 -08:00
div64.h	[NET]: div64_64 consolidate (rev3)	2007-04-25 22:23:33 -07:00
dma-mapping.h	[PATCH] m68k dma-mapping: gfp_t annotations	2007-03-14 15:27:51 -07:00
dma.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
dsp56k.h	[PATCH] m68k: dsp56k __user annotations	2006-01-12 09:09:04 -08:00
dvma.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +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	[PATCH] Add emergency_restart()	2005-07-26 14:35:41 -07:00
entry.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
errno.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
fb.h	fbdev: detect primary display device	2007-07-17 10:23:11 -07:00
fbio.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
fcntl.h	[PATCH] Clean up struct flock64 definitions	2005-09-07 16:57:38 -07:00
floppy.h	cleanup floppy.h	2007-10-17 08:42:55 -07:00
fpu.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
futex.h	[PATCH] consolidate asm/futex.h	2006-01-08 20:13:39 -08:00
hardirq.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
hp300hw.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
hw_irq.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
hwtest.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
ide.h	ide: add hwif->ack_intr hook	2007-10-20 00:32:32 +02:00
idprom.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
intersil.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
io.h	Remove dma_cache_(wback|inv|wback_inv) functions	2007-10-17 08:42:57 -07:00
ioctl.h	[PATCH] Generic ioctl.h	2006-01-10 08:01:34 -08:00
ioctls.h	m68k: Enable arbitary speed tty support	2007-08-22 19:52:45 -07:00
ipcbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
irq.h	take declarations of enable_irq() et.al. to linux/interrupt.h	2007-07-22 11:44:00 -07:00
irq_regs.h	[PATCH] m68k pt_regs fixes, part 2	2006-10-08 12:32:35 -07:00
Kbuild	m68k: Export cachectl.h	2007-10-13 09:41:03 -07:00
kdebug.h	move die notifier handling to common code	2007-05-08 11:15:04 -07:00
kmap_types.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
linkage.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
local.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mac_asc.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mac_baboon.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mac_iop.h	[PATCH] m68k pt_regs fixes	2006-10-07 10:51:14 -07:00
mac_mouse.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mac_oss.h	[PATCH] m68k: convert mac irq code	2006-06-25 10:00:58 -07:00
mac_psc.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mac_via.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
machdep.h	IRQ: Use the new typedef for interrupt handler function pointers	2006-10-09 12:19:47 +01:00
machines.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
machw.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
macintosh.h	mac68k: remove dead code	2008-02-05 09:44:24 -08:00
macints.h	[PATCH] m68k: convert mac irq code	2006-06-25 10:00:58 -07:00
math-emu.h	[PATCH] m68k: work around binutils tokenizer change	2007-02-11 10:51:20 -08:00
mc146818rtc.h	[PATCH] rtc-cmos needs RTC_ALWAYS_BCD known	2007-03-14 15:27:49 -07:00
md.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mman.h	[PATCH] add asm-generic/mman.h	2006-02-15 15:32:22 -08:00
mmu.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mmu_context.h	[PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction	2007-05-02 19:27:14 +02:00
mmzone.h	m68k: discontinuous memory support	2007-05-31 07:58:14 -07:00
module.h	m68k: discontinuous memory support	2007-05-31 07:58:14 -07:00
motorola_pgalloc.h	CONFIG_HIGHPTE vs. sub-page page tables.	2008-02-08 09:22:42 -08:00
motorola_pgtable.h	m68k: kill page walker compile warning	2008-02-07 09:10:06 -08:00
movs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
msgbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
mutex.h	[PATCH] mutex subsystem, add default include/asm-*/mutex.h files	2006-01-09 15:59:19 -08:00
mvme16xhw.h	[PATCH] m68k: convert VME irq code	2006-06-25 10:00:58 -07:00
mvme147hw.h	[PATCH] m68k: convert VME irq code	2006-06-25 10:00:58 -07:00
namei.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
nubus.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
openprom.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
oplib.h	[SPARC]: Kill prom_getname, unused and not implemented properly.	2006-07-21 14:17:55 -07:00
page.h	CONFIG_HIGHPTE vs. sub-page page tables.	2008-02-08 09:22:42 -08:00
page_offset.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
param.h	avoid overflows in kernel/time.c	2008-02-08 09:22:39 -08:00
parport.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pci.h	PCI: Use a weak symbol for the empty version of pcibios_add_platform_entries()	2007-07-11 16:02:07 -07:00
percpu.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
pgalloc.h	m68k: discontinuous memory support	2007-05-31 07:58:14 -07:00
pgtable.h	cleanup after APUS removal	2008-02-06 10:41:01 -08:00
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: move STACK_TOP[_MAX] to asm/processor.h	2008-02-08 09:22:29 -08:00
ptrace.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
q40_master.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
q40ints.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
raw_io.h	m68k {in,out}_le{16,32} endianness misannotation	2007-07-26 11:11:57 -07:00
resource.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
rtc.h	fix file specification in comments	2006-10-03 23:01:26 +02:00
sbus.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
scatterlist.h	Add CONFIG_DEBUG_SG sg validation	2007-10-22 21:20:03 +02:00
sections.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
segment.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
semaphore-helper.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
semaphore.h	kill DECLARE_MUTEX_LOCKED	2007-10-17 08:42:47 -07:00
sembuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
serial.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
setup.h	[PATCH] cleanup asm/setup.h userspace visibility	2006-12-07 08:39:46 -08:00
shm.h	Don't include linux/config.h from anywhere else in include/	2006-04-26 12:56:16 +01:00
shmbuf.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
shmparam.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
sigcontext.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
siginfo.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
signal.h	[PATCH] missing forward declaration of pt_regs (asm-m68k/signal.h)	2006-10-08 12:32:36 -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
spinlock.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
stat.h	[PATCH] 2TB files: st_blocks is invalid when calling stat64	2006-03-26 08:57:00 -08:00
statfs.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
string.h	[PATCH] m68k: cleanup string functions	2006-10-06 08:53:40 -07:00
sun3-head.h	[PATCH] Sun3: General updates	2006-12-09 09:41:18 -08:00
sun3_pgalloc.h	CONFIG_HIGHPTE vs. sub-page page tables.	2008-02-08 09:22:42 -08:00
sun3_pgtable.h	page table handling cleanup	2007-07-16 09:05:36 -07:00
sun3ints.h	[PATCH] Sun3: General updates	2006-12-09 09:41:18 -08:00
sun3mmu.h	[PATCH] sun3_ioremap() prototype	2006-10-15 11:00:58 -07:00
sun3x.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
sun3xflop.h	[PATCH] m68k pt_regs fixes	2006-10-07 10:51:14 -07:00
sun3xprom.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
suspend.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
system.h	Add cmpxchg_local to m86k	2008-02-07 08:42:32 -08:00
termbits.h	m68k: Enable arbitary speed tty support	2007-08-22 19:52:45 -07:00
termios.h	m68k: Enable arbitary speed tty support	2007-08-22 19:52:45 -07:00
thread_info.h	rename thread_info to stack	2007-05-09 12:30:56 -07:00
timex.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
tlb.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
tlbflush.h	remove unused flush_tlb_pgtables	2007-10-19 11:53:34 -07:00
topology.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
traps.h	[PATCH] m68k: convert generic irq code to irq controller	2006-06-25 10:00:57 -07:00
types.h	remove strict ansi check from __u64 in asm/types.h	2007-10-17 08:42:53 -07:00
uaccess.h	m68k: implement __clear_user()	2007-05-15 08:54:00 -07:00
ucontext.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
unaligned.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
unistd.h	m68k: ignore restart_syscall	2007-10-13 09:41:03 -07:00
user.h	Sanitize the type of struct user.u_ar0	2008-02-07 08:42:30 -08:00
virtconvert.h	m68k: discontinuous memory support	2007-05-31 07:58:14 -07:00
xor.h	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
zorro.h	[PATCH] m68k: basic iomem annotations	2006-01-12 09:09:02 -08:00