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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
..
m32104ut [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
m32700ut m32r: remove dead config symbols from M32R code 2008-02-05 09:44:08 -08:00
mappi2 [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
mappi3 [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
opsput [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
a.out.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
addrspace.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
assembler.h m32r: Rename STI/CLI macros 2007-09-06 11:10:56 +09:00
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 forbid asm/bitops.h direct inclusion 2007-10-19 11:53:41 -07:00
bug.h
bugs.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
byteorder.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
cache.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
cachectl.h
cacheflush.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
checksum.h [NET]: M32R checksum annotations and cleanups. 2006-12-02 21:23:06 -08:00
cputime.h
current.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
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.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -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
errno.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
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
flat.h Binfmt_flat: Add minimum support for the Blackfin relocations 2007-10-03 23:41:43 +08:00
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
hw_irq.h [PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend() 2006-06-29 10:26:23 -07:00
ide.h ide: add CONFIG_IDE_ARCH_OBSOLETE_INIT 2007-10-20 00:32:32 +02:00
io.h [PATCH] Consolidate check_signature 2006-10-11 11:14:23 -07:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h m32r: enable arbitary speed tty rate setting 2007-07-16 09:05:38 -07:00
ipcbuf.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
irq.h m32r: remove dead config symbols from M32R code 2008-02-05 09:44:08 -08:00
irq_regs.h [PATCH] m32r pt_regs fixes 2006-10-07 10:51:15 -07:00
Kbuild Add empty Kbuild files for 'make headers_install' in remaining arches. 2006-06-18 12:58:53 +01:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
kmap_types.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
linkage.h
local.h local_t m32r use architecture specific cmpxchg_local 2008-02-07 08:42:32 -08:00
m32r.h m32r: Define symbols to unify platform-dependent ICU checks 2007-09-03 11:30:18 +09:00
m32r_mp_fpga.h
m32102.h [PATCH] m32r: support a synthesizable M32700 core 2006-12-08 08:28:37 -08:00
mc146818rtc.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
mman.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
mmu.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
mmu_context.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mmzone.h [PATCH] unify pfn_to_page: m32r pfn_to_page 2006-03-27 08:44:45 -08:00
module.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
msgbuf.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
param.h avoid overflows in kernel/time.c 2008-02-08 09:22:39 -08:00
pci.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
percpu.h
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable-2level.h m32r: fix pte_to_pgoff(), pgoff_to_pte() and __swp_type() macros 2007-05-11 08:29:33 -07:00
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 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 m32r: convert to generic sys_ptrace 2007-10-16 09:43:04 -07:00
resource.h
rtc.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
s1d13806.h
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
sections.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
segment.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
serial.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
setup.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
shmbuf.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
shmparam.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
sigcontext.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
siginfo.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
signal.h core: remove last users of empty FASTCALL macro 2008-01-30 13:31:17 +01:00
smp.h Remove hardcoding of hard_smp_processor_id on UP systems 2007-05-09 12:30:48 -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 [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
spinlock_types.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
stat.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
statfs.h
string.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
syscall.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
system.h Fix m32r __xchg 2008-02-07 08:42:32 -08:00
termbits.h m32r: enable arbitary speed tty rate setting 2007-07-16 09:05:38 -07:00
termios.h m32r: enable arbitary speed tty rate setting 2007-07-16 09:05:38 -07:00
thread_info.h m32r: Update sys_rt_sigsuspend 2007-11-28 01:24:04 +09:00
timex.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
tlb.h
tlbflush.h remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
topology.h
types.h remove strict ansi check from __u64 in asm/types.h 2007-10-17 08:42:53 -07:00
uaccess.h [PATCH] fix sparse warnings from {asm,net}/checksum.h 2007-02-11 10:51:31 -08:00
ucontext.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
unaligned.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
unistd.h timerfd: fix remaining architectures 2008-02-05 14:37:15 -08:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
vga.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00
xor.h [PATCH] m32r: cosmetic updates and trivial fixes 2007-02-11 10:51:20 -08:00