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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
..
sn [IA64] Update Altix BTE error return status patch 2008-01-03 13:18:58 -08:00
a.out.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
acpi-ext.h [IA64] update HP CSR space discovery via ACPI 2006-04-06 14:42:38 -07:00
acpi.h x86: voluntary leave_mm before entering ACPI C3 2008-01-30 13:32:01 +01:00
agp.h x86: remove flush_agp_mappings() 2008-01-30 13:34:07 +01:00
asmmacro.h [IA64] remove per-cpu ia64_phys_stacked_size_p8 2007-02-06 15:04:18 -08:00
atomic.h [IA64] Use atomic64_read to read an atomic64_t. 2007-08-13 10:21:04 -07:00
auxvec.h [PATCH] auxiliary vector cleanups 2005-09-07 16:57:21 -07:00
bitops.h [IA64] Slim-down __clear_bit_unlock 2008-02-04 15:19:16 -08:00
break.h [IA64] enable trap code on slot 1 2006-12-12 12:00:55 -08:00
bug.h [PATCH] remove gcc-2 checks 2006-01-08 20:14:02 -08:00
bugs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
byteorder.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cache.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cacheflush.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
checksum.h [PATCH] fix prototype of csum_ipv6_magic() (ia64) 2007-01-23 11:09:49 -08:00
compat.h asm-*/compat.h: fix typo in comment 2008-02-03 16:32:51 +02:00
cpu.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
cyclone.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
delay.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
device.h ACPI: Change ACPI to use dev_archdata instead of firmware_data 2006-12-01 14:52:01 -08:00
div64.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dma-mapping.h IA64: sg chaining support 2007-10-16 11:27:26 +02:00
dma.h [IA64] swiotlb bug fixes 2007-02-05 18:46:40 -08:00
dmi.h [PATCH] ia64: use i386 dmi_scan.c 2006-03-26 08:56:54 -08:00
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 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
esi.h [IA64] remove bogus prototype ia64_esi_init() 2007-02-05 14:14:29 -08:00
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h [PATCH] Clean up struct flock definitions 2005-09-07 16:57:38 -07:00
fpswa.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fpu.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
gcc_intrin.h [IA64] fix userspace compile error in gcc_intrin.h 2008-02-04 15:08:25 -08:00
hardirq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
hpsim.h [IA64] Cleanup HPSIM code (was: Re: Enable early console for Ski simulator) 2007-09-01 02:52:25 -07:00
hw_irq.h [IA64] Two trivial spelling fixes 2007-12-18 17:02:21 -08:00
ia32.h [IA64] rename partial_page 2007-07-25 12:56:39 -07:00
ia64regs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ide.h ide: add CONFIG_IDE_ARCH_OBSOLETE_INIT 2007-10-20 00:32:32 +02:00
intel_intrin.h IA64: Slim down __clear_bit_unlock 2007-12-18 16:22:46 -08:00
intrinsics.h Add cmpxchg_local, cmpxchg64 and cmpxchg64_local to ia64 2008-02-07 08:42:32 -08:00
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 [IA64] arbitary speed tty ioctl support 2007-07-13 16:04:12 -07:00
iosapic.h [IA64] iosapic cleanup 2007-12-07 16:11:12 -08:00
ipcbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
irq.h take declarations of enable_irq() et.al. to linux/interrupt.h 2007-07-22 11:44:00 -07:00
Kbuild [PATCH] cleanup asm/setup.h userspace visibility 2006-12-07 08:39:46 -08:00
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
kmap_types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
kprobes.h kprobes: support kretprobe blacklist 2007-10-16 09:43:10 -07:00
kregs.h [IA64] relax per-cpu TLB requirement to DTC 2007-02-06 15:04:48 -08:00
libata-portmap.h ATA convert GSI to irq on ia64 2007-02-15 18:04:53 -05:00
linkage.h [PATCH] abstract type/size specification for assembly 2006-03-24 07:33:25 -08:00
local.h local_t: ia64 extension 2007-05-08 11:15:20 -07:00
machvec_dig.h [IA64] cleanup dig_irq_init 2006-03-24 13:12:46 -08:00
machvec_hpsim.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
machvec_hpzx1_swiotlb.h [IA64] more robust zx1/sx1000 machvec support 2005-09-14 16:22:11 -07:00
machvec_hpzx1.h [IA64] more robust zx1/sx1000 machvec support 2005-09-14 16:22:11 -07:00
machvec_init.h [IA64] SN2 needs platform specific irq_to_vector() function. 2007-08-13 10:31:26 -07:00
machvec_sn2.h [IA64] SN2 needs platform specific irq_to_vector() function. 2007-08-13 10:31:26 -07:00
machvec.h [IA64] SN2 needs platform specific irq_to_vector() function. 2007-08-13 10:31:26 -07:00
mc146818rtc.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mca_asm.h [IA64] mca style cleanup 2008-02-04 15:42:06 -08:00
mca.h [IA64] mca style cleanup 2008-02-04 15:42:06 -08:00
meminit.h Use extended crashkernel command line on ia64 2007-10-19 11:53:50 -07:00
mman.h [PATCH] IA64,sparc: local DoS with corrupted ELFs 2006-09-08 08:40:46 -07:00
mmu_context.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mmu.h [IA64] Fix race in mm-context wrap-around logic. 2005-08-12 15:05:21 -07:00
mmzone.h [PATCH] V5 ia64 SPARSEMEM - conditional changes for SPARSEMEM 2005-10-04 13:21:13 -07:00
module.h [PATCH] Move compiler check for modules to ia64 only 2006-09-26 10:52:37 +02:00
msgbuf.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mutex.h [IA64] fix bug in ia64 __mutex_fastpath_trylock 2006-04-07 22:39:49 -07:00
namei.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
nodedata.h [PATCH] pgdat allocation and update for ia64 of memory hotplug: update pgdat address array 2006-06-27 17:32:37 -07:00
numa.h Add vmcoreinfo 2007-10-17 08:42:54 -07:00
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pal.h [IA64] Update printing of feature set bits 2007-11-09 13:05:30 -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 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
patch.h [IA64] remove per-cpu ia64_phys_stacked_size_p8 2007-02-06 15:04:18 -08:00
pci.h [IA64] Un-break ia64 build 2007-07-12 16:04:39 -07:00
percpu.h ia64: on UP percpu variables are not small memory model 2008-01-30 23:27:58 +01:00
perfmon_default_smpl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
perfmon.h [IA64] alternate perfmon handler 2005-05-18 16:14:30 -07:00
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
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 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2008-02-05 10:24:52 -08:00
ptrace_offsets.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ptrace.h [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
resource.h [IA64] Remove stack hard limit on ia64 2007-03-06 14:48:19 -08:00
rse.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rwsem.h [IA64] Prevent people from directly including <asm/rwsem.h>. 2007-07-20 11:27:11 -07:00
sal.h [IA64] Export three symbols for module use 2008-02-04 15:46:23 -08:00
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
sections.h [IA64] remove per-cpu ia64_phys_stacked_size_p8 2007-02-06 15:04:18 -08:00
segment.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
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 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup.h [PATCH] ia64: 2048-byte command line 2007-02-12 09:48:39 -08:00
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 [PATCH] consolidate SIGEV_PAD_SIZE 2005-05-01 08:59:08 -07:00
signal.h [PATCH] irq-flags: IA64: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
smp.h [IA64] /proc/cpuinfo "physical id" field cleanups 2007-10-29 11:14:54 -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
sparsemem.h [PATCH] V5 ia64 SPARSEMEM - conditional changes for SPARSEMEM 2005-10-04 13:21:13 -07:00
spinlock_types.h [PATCH] spinlock consolidation 2005-09-10 10:06:21 -07:00
spinlock.h remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
stat.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
statfs.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
string.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
suspend.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
system.h increase AT_VECTOR_SIZE to terminate saved_auxv properly 2007-10-17 08:43:00 -07:00
termbits.h [IA64] arbitary speed tty ioctl support 2007-07-13 16:04:12 -07:00
termios.h [IA64] arbitary speed tty ioctl support 2007-07-13 16:04:12 -07:00
thread_info.h remove unused TIF_NOTIFY_RESUME flag 2007-07-31 15:39:38 -07:00
timex.h [IA64] ia64: simplify and fix udelay() 2006-02-15 13:37:04 -08:00
tlb.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
tlbflush.h [IA64] make flush_tlb_kernel_range() an inline function 2007-12-19 12:30:30 -08:00
topology.h Convert cpu_sibling_map to be a per cpu variable 2007-10-16 09:42:50 -07:00
types.h [PATCH] sab: consolidate kmem_bufctl_t 2005-09-05 00:05:48 -07:00
uaccess.h [IA64] don't double >> PAGE_SHIFT pointer for /dev/kmem access 2006-10-26 14:57:06 -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
uncached.h [PATCH] ia64 uncached alloc 2005-06-21 18:46:18 -07:00
unistd.h [IA64] fallocate system call 2007-07-19 13:48:00 -07:00
unwind.h [IA64] Remove sparse warning from unwind code 2007-03-08 10:28:48 -08:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
ustack.h arch: personality independent stack top 2007-07-19 10:04:45 -07:00
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
xor.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00