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linux/arch/blackfin/include/asm
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David Howells 8feae13110 NOMMU: Make VMAs per MM as for MMU-mode linux 
Make VMAs per mm_struct as for MMU-mode linux.  This solves two problems:

 (1) In SYSV SHM where nattch for a segment does not reflect the number of
     shmat's (and forks) done.

 (2) In mmap() where the VMA's vm_mm is set to point to the parent mm by an
     exec'ing process when VM_EXECUTABLE is specified, regardless of the fact
     that a VMA might be shared and already have its vm_mm assigned to another
     process or a dead process.

A new struct (vm_region) is introduced to track a mapped region and to remember
the circumstances under which it may be shared and the vm_list_struct structure
is discarded as it's no longer required.

This patch makes the following additional changes:

 (1) Regions are now allocated with alloc_pages() rather than kmalloc() and
     with no recourse to __GFP_COMP, so the pages are not composite.  Instead,
     each page has a reference on it held by the region.  Anything else that is
     interested in such a page will have to get a reference on it to retain it.
     When the pages are released due to unmapping, each page is passed to
     put_page() and will be freed when the page usage count reaches zero.

 (2) Excess pages are trimmed after an allocation as the allocation must be
     made as a power-of-2 quantity of pages.

 (3) VMAs are added to the parent MM's R/B tree and mmap lists.  As an MM may
     end up with overlapping VMAs within the tree, the VMA struct address is
     appended to the sort key.

 (4) Non-anonymous VMAs are now added to the backing inode's prio list.

 (5) Holes may be punched in anonymous VMAs with munmap(), releasing parts of
     the backing region.  The VMA and region structs will be split if
     necessary.

 (6) sys_shmdt() only releases one attachment to a SYSV IPC shared memory
     segment instead of all the attachments at that addresss.  Multiple
     shmat()'s return the same address under NOMMU-mode instead of different
     virtual addresses as under MMU-mode.

 (7) Core dumping for ELF-FDPIC requires fewer exceptions for NOMMU-mode.

 (8) /proc/maps is now the global list of mapped regions, and may list bits
     that aren't actually mapped anywhere.

 (9) /proc/meminfo gains a line (tagged "MmapCopy") that indicates the amount
     of RAM currently allocated by mmap to hold mappable regions that can't be
     mapped directly.  These are copies of the backing device or file if not
     anonymous.

These changes make NOMMU mode more similar to MMU mode.  The downside is that
NOMMU mode requires some extra memory to track things over NOMMU without this
patch (VMAs are no longer shared, and there are now region structs).

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Mike Frysinger <vapier.adi@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
2009-01-08 12:04:47 +00:00
..
.gitignore Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
atomic.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
auxvec.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
bfin5xx_spi.h Blackfin arch: cleanup the header file comments 2009-01-07 23:14:38 +08:00
bfin_sdh.h Blackfin arch: add SDIO host driver platform data 2009-01-07 23:14:38 +08:00
bfin_simple_timer.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
bfin_sport.h Blackfin arch: drop ad73311 test code 2009-01-07 23:14:38 +08:00
bfin-global.h Blackfin arch: rename cache_lock() to bfin_cache_lock() 2008-11-18 17:48:22 +08:00
bfrom.h Blackfin arch: Update some inline assembly, tweak some register constraints 2009-01-07 23:14:39 +08:00
bitops.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
blackfin.h Blackfin arch: only define HI/LO macros for assembly files 2008-11-18 17:48:22 +08:00
bug.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
bugs.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
byteorder.h blackfin: introduce asm/swab.h 2009-01-06 18:10:28 -08:00
cache.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
cacheflush.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
cdef_LPBlackfin.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
checksum.h Blackfin arch: fix bug - crashes in tcp_v4_send_reset 2009-01-07 23:14:39 +08:00
clocks.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
context.S Blackfin arch: Faster C implementation of no-MPU CPLB handler 2009-01-07 23:14:38 +08:00
cplb.h Blackfin arch: Faster C implementation of no-MPU CPLB handler 2009-01-07 23:14:38 +08:00
cplbinit.h Blackfin arch: Faster C implementation of no-MPU CPLB handler 2009-01-07 23:14:38 +08:00
cpu.h Blackfin arch: delete now unused "cclk" member of blackfin_cpudata 2009-01-07 23:14:38 +08:00
cputime.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
current.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
def_LPBlackfin.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
delay.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
device.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
div64.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
dma-mapping.h Blackfin arch: fix a broken define in dma-mapping 2008-11-18 17:48:22 +08:00
dma.h Blackfin arch: add get_dma_config() func to match set_dma_config() 2009-01-07 23:14:38 +08:00
dpmc.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
early_printk.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
elf.h [PATCH] remove unused ibcs2/PER_SVR4 in SET_PERSONALITY 2008-10-16 15:40:05 +02:00
emergency-restart.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
entry.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
errno.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
fb.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
fcntl.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
fixed_code.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
flat.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
futex.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
gpio.h Blackfin arch: gpio.h split into machine subfolders like already done for BF54x 2009-01-07 23:14:39 +08:00
gptimers.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
hardirq.h Blackfin arch: move ack_bad_irq() prototype to hardirq.h to match other arches 2008-11-18 17:48:22 +08:00
hw_irq.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
io.h Blackfin arch: Use reads/writes instead of ins/outs directly 2009-01-07 23:14:39 +08:00
ioctl.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
ioctls.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
ipcbuf.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
ipipe_base.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
ipipe.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
irq_handler.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
irq_regs.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
irq.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
Kbuild blackfin: introduce asm/swab.h 2009-01-06 18:10:28 -08:00
kdebug.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
kgdb.h Blackfin arch: add supporting for kgdb 2008-10-13 14:07:19 +08:00
kmap_types.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
l1layout.h Blackfin arch: disable pthread stack check for SMP at runtime 2009-01-07 23:14:38 +08:00
linkage.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
local.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
mem_init.h Blackfin arch: enable reprogram cclk and sclk for bf518f-ezbrd 2009-01-07 23:14:38 +08:00
mem_map.h Blackfin arch: smp patch cleanup from LKML review 2009-01-07 23:14:39 +08:00
mman.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
mmu_context.h Blackfin arch: SMP supporting patchset: Blackfin CPLB related code 2008-11-18 17:48:22 +08:00
mmu.h NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
module.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
msgbuf.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
mutex-dec.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
mutex.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
nand.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
page_offset.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
page.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
param.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
pci.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
pda.h Blackfin arch: move out irq related functions 2008-11-18 17:48:22 +08:00
percpu.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
pgalloc.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
pgtable.h Blackfin arch: stub out pgprot_noncached() like other people seem to do on nommu 2009-01-07 23:14:39 +08:00
poll.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
portmux.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
posix_types.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
processor.h Blackfin arch: disable pthread stack check for SMP at runtime 2009-01-07 23:14:38 +08:00
ptrace.h Blackfin arch: ptrace - make sure PT_ORIG_R0 and PT_ORIG_P0 offsets are declared 2008-10-09 15:22:56 +08:00
reboot.h Blackfin arch: update header to match new location 2009-01-07 23:14:39 +08:00
resource.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
rwlock.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
scatterlist.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
sections.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
segment.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
sembuf.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
serial.h Blackfin arch: define BASE_BAUD like everyone else 2008-11-18 17:48:22 +08:00
setup.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
shmbuf.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
shmparam.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
sigcontext.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
siginfo.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
signal.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
smp.h Blackfin arch: smp patch cleanup from LKML review 2009-01-07 23:14:39 +08:00
socket.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
sockios.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
spinlock_types.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
spinlock.h Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code 2009-01-07 23:14:39 +08:00
stat.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
statfs.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
string.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
swab.h blackfin: introduce asm/swab.h 2009-01-06 18:10:28 -08:00
system.h Blackfin arch: merge adeos blackfin part to arch/blackfin/ 2009-01-07 23:14:39 +08:00
termbits.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
termios.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
thread_info.h Blackfin arch: disable pthread stack check for SMP at runtime 2009-01-07 23:14:38 +08:00
time.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
timex.h Blackfin arch: make sure cycles is marked as volatile so gcc doesnt reorder on us 2008-10-16 23:55:41 +08:00
tlb.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
tlbflush.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
topology.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
trace.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
traps.h Blackfin arch: Better error handling of unknown exceptions 2008-10-08 14:43:47 +08:00
types.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
uaccess.h Blackfin arch: add __must_check markings to our user functions like other arches 2009-01-07 23:14:38 +08:00
ucontext.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
unaligned.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
unistd.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
user.h Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
xor.h Blackfin arch: use generic xor.h 2008-11-18 17:48:22 +08:00