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Nick Piggin 7e675137a8 mm: introduce pte_special pte bit 
s390 for one, cannot implement VM_MIXEDMAP with pfn_valid, due to their memory
model (which is more dynamic than most).  Instead, they had proposed to
implement it with an additional path through vm_normal_page(), using a bit in
the pte to determine whether or not the page should be refcounted:

vm_normal_page()
{
	...
        if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
                if (vma->vm_flags & VM_MIXEDMAP) {
#ifdef s390
			if (!mixedmap_refcount_pte(pte))
				return NULL;
#else
                        if (!pfn_valid(pfn))
                                return NULL;
#endif
                        goto out;
                }
	...
}

This is fine, however if we are allowed to use a bit in the pte to determine
refcountedness, we can use that to _completely_ replace all the vma based
schemes.  So instead of adding more cases to the already complex vma-based
scheme, we can have a clearly seperate and simple pte-based scheme (and get
slightly better code generation in the process):

vm_normal_page()
{
#ifdef s390
	if (!mixedmap_refcount_pte(pte))
		return NULL;
	return pte_page(pte);
#else
	...
#endif
}

And finally, we may rather make this concept usable by any architecture rather
than making it s390 only, so implement a new type of pte state for this.
Unfortunately the old vma based code must stay, because some architectures may
not be able to spare pte bits.  This makes vm_normal_page a little bit more
ugly than we would like, but the 2 cases are clearly seperate.

So introduce a pte_special pte state, and use it in mm/memory.c.  It is
currently a noop for all architectures, so this doesn't actually result in any
compiled code changes to mm/memory.o.

BTW:
I haven't put vm_normal_page() into arch code as-per an earlier suggestion.
The reason is that, regardless of where vm_normal_page is actually
implemented, the *abstraction* is still exactly the same. Also, while it
depends on whether the architecture has pte_special or not, that is the
only two possible cases, and it really isn't an arch specific function --
the role of the arch code should be to provide primitive functions and
accessors with which to build the core code; pte_special does that. We do
not want architectures to know or care about vm_normal_page itself, and
we definitely don't want them being able to invent something new there
out of sight of mm/ code. If we made vm_normal_page an arch function, then
we have to make vm_insert_mixed (next patch) an arch function too. So I
don't think moving it to arch code fundamentally improves any abstractions,
while it does practically make the code more difficult to follow, for both
mm and arch developers, and easier to misuse.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Carsten Otte <cotte@de.ibm.com>
Cc: Jared Hulbert <jaredeh@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-04-28 08:58:23 -07:00
..
arch-aaec2000 Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
arch-at91 [ARM] 4913/1: [AT91] PMC_MDIV definitions 2008-04-10 14:57:20 +01:00
arch-cl7500 [ARM] Use new get_irqnr_preamble 2007-05-12 15:25:50 +01:00
arch-clps711x [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-davinci [ARM] 4634/1: DaVinci GPIO header build fix 2007-10-31 15:21:52 +00:00
arch-ebsa110 [ARM] Use new get_irqnr_preamble 2007-05-12 15:25:50 +01:00
arch-ebsa285 [ARM] Use new get_irqnr_preamble 2007-05-12 15:25:50 +01:00
arch-ep93xx [ARM] 4988/1: Add GPIO lib support to the EP93xx 2008-04-19 14:01:43 +01:00
arch-h720x [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-imx imxfb: fast read flag and nonstandard field configurable 2007-10-16 09:43:21 -07:00
arch-integrator [ARM] Remove Integrator/CP SMP platform support 2007-05-16 15:35:26 +01:00
arch-iop13xx iop-adma: remove the workaround for missed interrupts on iop3xx 2008-04-17 13:25:54 -07:00
arch-iop32x [ARM] 4476/1: EM7210/SS4000E support 2007-07-20 09:35:35 +01:00
arch-iop33x iop3xx: surface the iop3xx DMA and AAU units to the iop-adma driver 2007-07-13 08:06:19 -07:00
arch-ixp4xx Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-02-04 15:29:53 -08:00
arch-ixp23xx [ARM] 4680/1: parentheses around NR_IRQS definition 2007-11-29 20:56:57 +00:00
arch-ixp2000 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-ks8695 [ARM] 4981/1: [KS8695] Simple LED driver 2008-04-17 15:58:25 +01:00
arch-l7200 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-lh7a40x [ARM] 4248/1: lh7a40x: fix missing definitions for get_irqnr_preamble 2007-03-08 13:33:57 +00:00
arch-msm [ARM] msm: dma support for MSM7X00A 2008-01-26 14:39:14 +00:00
arch-mxc [ARM] 4887/1: i.MXC family: Separate current platform code 2008-04-17 16:15:17 +01:00
arch-netx [ARM] 4329/1: fix position of NETX_SYSTEM_REG 2007-05-03 20:22:49 +01:00
arch-ns9xxx ns9xxx: let putc autodetect where to write 2008-03-31 08:17:01 +02:00
arch-omap Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2008-04-21 17:23:30 -07:00
arch-orion5x Orion: orion -> orion5x rename 2008-03-27 14:51:41 -04:00
arch-pnx4008 [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-pxa [MTD] [NAND] support for pxa3xx 2008-04-22 19:27:27 +01:00
arch-realview RealView: Add uncompressing support for PB1176 2008-04-18 22:43:16 +01:00
arch-rpc [ARM] 4564/1: Add tagged list support for Acorn RiscPC's uncompress code 2007-10-12 23:43:11 +01:00
arch-s3c2400 [ARM] 4522/1: S3C: split include/asm-arm/arch/memory.h 2007-07-22 17:06:04 +01:00
arch-s3c2410 Merge branch 'merge-fixes' into devel 2008-04-19 17:17:34 +01:00
arch-sa1100 ide: add struct ide_io_ports (take 3) 2008-04-27 15:38:32 +02:00
arch-shark [ARM] 4185/2: entry: introduce get_irqnr_preamble and arch_ret_to_user 2007-02-17 15:04:29 +00:00
arch-versatile fix typo 'the same the\>' 2008-02-03 14:59:11 +02:00
hardware Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial 2008-04-21 16:36:46 -07:00
mach iop: unconditionally initialize the ATU on platforms known to be 'hosts' 2008-03-26 12:33:41 -07:00
plat-orion plat-orion: make orion_nand available for all Orion families 2008-03-27 14:51:40 -04:00
plat-s3c [MTD] [NAND] S3C2410 Allow ECC disable to be specified by the board 2008-04-22 21:41:32 +01:00
plat-s3c24xx [ARM] 4786/1: S3C2412: Add SPI FIFO controll constants 2008-01-28 13:20:51 +00:00
.gitignore [ARM] 4216/1: add .gitignore entries for ARM specific files 2007-02-17 11:26:41 +00:00
Kbuild [ARM] 4473/2: Take the HWCAP definitions out of the elf.h file 2007-07-12 16:20:15 +01:00
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
assembler.h [ARM] Remove MODE_(SVC|IRQ|FIQ|USR) and DEFAULT_FIQ 2006-06-25 12:01:48 +01:00
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
…
bitops.h ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
bug.h [ARM] 3983/2: remove unused argument to __bug() 2006-12-07 22:38:09 +00:00
bugs.h [ARM] nommu: adjust headers for !MMU ARM systems 2006-06-28 17:59:45 +01:00
byteorder.h [ARM] Fix byte order macros for Thumb 2006-06-19 15:35:36 +01:00
cache.h
…
cacheflush.h [ARM] Marvell Feroceon CPU core support 2008-01-26 15:03:38 +00:00
checksum.h [ARM] Improve csum_fold, cleanup csum_tcpudp_magic() 2007-02-06 16:46:46 +00:00
cnt32_to_63.h [ARM] 3978/1: macro to provide a 63-bit value from a 32-bit hardware counter 2006-12-07 16:06:45 +00:00
cpu-multi32.h Add a prefetch abort handler 2008-04-18 22:43:07 +01:00
cpu-single.h [ARM] Unuse another Linux PTE bit 2006-12-13 14:34:43 +00:00
cpu.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cputime.h
…
current.h
…
delay.h [ARM] 3346/1: Fix udelay() for HZ values different from 100 2006-03-21 22:06:07 +00:00
device.h [ARM] Add a reference from struct device to the dma bounce info 2007-02-12 10:28:24 +00:00
div64.h [NET]: div64_64 consolidate (rev3) 2007-04-25 22:23:33 -07:00
dma-mapping.h arm: sg fallout 2007-10-23 12:37:59 +02:00
dma.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
domain.h [ARM] 4127/1: Flush the prefetch buffer after changing the DACR 2007-02-08 14:49:18 +00:00
dyntick.h [ARM] 3692/1: ARM: coswitch irq handling to the generic implementation 2006-07-01 22:30:09 +01:00
ecard.h [ARM] ecard: add ecardm_iomap() / ecardm_iounmap() 2007-05-11 17:19:02 +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
…
errno.h
…
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h
…
fiq.h
…
flat.h [ARM] nommu: fix breakage caused by f9720205d1 2007-10-31 15:21:42 +00:00
floppy.h cleanup floppy.h 2007-10-17 08:42:55 -07:00
fpstate.h [ARM] 4583/1: ARMv7: Add VFPv3 support 2008-01-26 14:41:28 +00:00
futex.h
…
glue.h Add a prefetch abort handler 2008-04-18 22:43:07 +01:00
gpio.h [PATCH] GPIO core 2007-02-12 09:48:34 -08:00
hardirq.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
hardware.h
…
hw_irq.h [PATCH] misc arm pt_regs fixes 2006-10-08 12:32:36 -07:00
hwcap.h ARMv7: Add support for the ThumbEE state saving/restoring 2008-04-18 22:43:06 +01:00
ide.h ide: remove ide_default_io_ctl() macro 2008-04-18 00:46:34 +02:00
io.h endianness annotations in arm io.h 2007-10-14 12:41:52 -07:00
ioctl.h
…
ioctls.h [ARM] enable arbitary speed tty ioctls and split input/output speed 2007-05-28 23:07:34 +01:00
ipcbuf.h
…
irq.h [ARM] 4073/1: Prevent s3c24xx drivers from including asm/arch/hardware.h and asm/arch/irqs.h 2006-12-30 17:05:07 +00:00
irq_regs.h Initial blind fixup for arm for irq changes 2006-10-06 10:59:54 -07:00
irqflags.h [ARM] Add ARM irqtrace support 2006-09-20 14:58:35 +01:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
kexec.h [ARM] 4838/1: Fix kexec for SA1100 machines 2008-02-29 22:47:09 +00:00
kmap_types.h
…
kprobes.h Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
kvm.h kvm: provide kvm.h for all architecture: fixes headers_install 2008-04-02 15:28:18 -07:00
leds.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
limits.h
…
linkage.h [ARM] VFP: fix section mismatch error 2007-06-10 12:22:20 +01:00
local.h
…
locks.h
…
mc146818rtc.h
…
memory.h [ARM] Add initial sparsemem support 2008-04-19 11:36:48 +01:00
mman.h
…
mmu.h [ARM] ARMv6: add CPU_HAS_ASID configuration 2007-05-17 10:19:23 +01:00
mmu_context.h [ARM] ARMv6: add CPU_HAS_ASID configuration 2007-05-17 10:19:23 +01:00
mmzone.h
…
module.h
…
msgbuf.h
…
mtd-xip.h
…
mutex.h misc: removal of final callers using fastcall 2008-02-08 09:22:31 -08:00
namei.h
…
nwflash.h
…
page-nommu.h [ARM] nommu: adjust headers for !MMU ARM systems 2006-06-28 17:59:45 +01:00
page.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
param.h [ARM] Move HZ definition into Kconfig 2006-03-21 22:05:45 +00:00
parport.h
…
pci.h [ARM] 4577/1: ITE 8152 PCI bridge support 2007-10-15 18:53:59 +01:00
percpu.h
…
pgalloc.h CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
pgtable-hwdef.h [ARM] Set bit 4 on section mappings correctly depending on CPU 2006-06-29 18:24:21 +01:00
pgtable-nommu.h [ARM] 4850/1: include generic pgtable.h for !CONFIG_MMU case 2008-03-06 12:18:18 +00:00
pgtable.h mm: introduce pte_special pte bit 2008-04-28 08:58:23 -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
proc-fns.h [ARM] include/asm-arm - use angle brackets for includes 2008-03-06 12:18:18 +00:00
processor.h aout: move STACK_TOP[_MAX] to asm/processor.h 2008-02-08 09:22:29 -08:00
procinfo.h [ARM] Move HWCAP_* definitions to asm/elf.h 2006-11-30 12:24:46 +00:00
ptrace.h [ARM] 4474/1: Do not check the PSR_F_BIT in valid_user_regs 2007-07-12 16:20:52 +01:00
resource.h
…
rtc.h [PATCH] RTC subsystem: ARM cleanup 2006-03-27 08:44:50 -08:00
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
sections.h
…
segment.h
…
semaphore.h Generic semaphore implementation 2008-04-17 10:42:34 -04:00
sembuf.h
…
serial.h
…
setup.h [ARM] use __used attribute 2007-05-30 13:15:06 +01:00
shmbuf.h
…
shmparam.h
…
sigcontext.h
…
siginfo.h
…
signal.h [PATCH] ARM: fixup irqflags breakage after ARM genirq merge 2006-07-02 17:29:22 -07:00
sizes.h [ARM] 4372/1: Define byte sizes in asm-arm/sizes.h 2007-05-11 21:07:58 +01:00
smp.h [ARM] 4814/1: RealView: Add broadcasting clockevents support for ARM11MPCore 2008-02-04 17:52:19 +00:00
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 [ARM] Add initial sparsemem support 2008-04-19 11:36:48 +01:00
spinlock.h [PATCH] Remove the last reference to rwlock_is_locked() macro. 2007-02-11 10:51:34 -08:00
spinlock_types.h
…
stat.h
…
statfs.h
…
string.h
…
suspend.h
…
system.h Add cmpxchg_local to arm 2008-02-07 08:42:31 -08:00
termbits.h [ARM] enable arbitary speed tty ioctls and split input/output speed 2007-05-28 23:07:34 +01:00
termios.h [ARM] enable arbitary speed tty ioctls and split input/output speed 2007-05-28 23:07:34 +01:00
therm.h
…
thread_info.h ARMv7: Add support for the ThumbEE state saving/restoring 2008-04-18 22:43:06 +01:00
thread_notify.h [ARM] Add thread_notify infrastructure 2006-06-22 10:24:18 +01:00
timex.h
…
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
…
traps.h ARM kprobes: prevent some functions involved with kprobes from being probed 2008-01-26 15:25:17 +00:00
types.h remove strict ansi check from __u64 in asm/types.h 2007-10-17 08:42:53 -07:00
uaccess.h Storage class should be before const qualifier 2007-02-17 20:11:19 +01:00
ucontext.h [ARM] 3664/1: crunch: add signal frame save/restore 2006-06-28 17:54:59 +01:00
unaligned.h [ARM] 4837/1: make __get_unaligned_*() return unsigned types 2008-02-29 22:46:48 +00:00
unistd.h [ARM] 4852/1: Add timerfd_create, timerfd_settime and timerfd_gettime syscall entries 2008-04-19 11:28:06 +01:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
vfp.h [ARM] 4583/1: ARMv7: Add VFPv3 support 2008-01-26 14:41:28 +00:00
vfpmacros.h [ARM] 4583/1: ARMv7: Add VFPv3 support 2008-01-26 14:41:28 +00:00
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
xor.h
…