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David Howells 165b239270 [PATCH] NOMMU: make SYSV SHM nattch work correctly 
Make the SYSV SHM nattch counter work correctly by forcing multiple VMAs to
be produced to represent MAP_SHARED segments, even if they overlap exactly.

Using this test program:

	http://people.redhat.com/~dhowells/doshm.c

Run as:

	doshm sysv

I can see nattch going from one before the patch:

	# /doshm sysv
	Command: sysv
	shmid: 65536
	memory: 0xc3700000
	c0b00000-c0b04000 rw-p 00000000 00:00 0
	c0bb0000-c0bba788 r-xs 00000000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3180000-c31dede4 r-xs 00000000 00:0b 14582179  /lib/libuClibc-0.9.28.so
	c3520000-c352278c rw-p 00000000 00:0b 13763417  /doshm
	c3584000-c35865e8 r-xs 00000000 00:0b 13763417  /doshm
	c3588000-c358aa00 rw-p 00008000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3590000-c359b6c0 rw-p 00000000 00:00 0
	c3620000-c3640000 rwxp 00000000 00:00 0
	c3700000-c37fa000 rw-S 00000000 00:06 1411      /SYSV00000000 (deleted)
	c3700000-c37fa000 rw-S 00000000 00:06 1411      /SYSV00000000 (deleted)
	nattch 1

To two after the patch:

	# /doshm sysv
	Command: sysv
	shmid: 0
	memory: 0xc3700000
	c0bb0000-c0bba788 r-xs 00000000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3180000-c31dede4 r-xs 00000000 00:0b 14582179  /lib/libuClibc-0.9.28.so
	c3320000-c3340000 rwxp 00000000 00:00 0
	c3530000-c35325e8 r-xs 00000000 00:0b 13763417  /doshm
	c3534000-c353678c rw-p 00000000 00:0b 13763417  /doshm
	c3538000-c353aa00 rw-p 00008000 00:0b 14582157  /lib/ld-uClibc-0.9.28.so
	c3590000-c359b6c0 rw-p 00000000 00:00 0
	c35a4000-c35a8000 rw-p 00000000 00:00 0
	c3700000-c37fa000 rw-S 00000000 00:06 1369      /SYSV00000000 (deleted)
	c3700000-c37fa000 rw-S 00000000 00:06 1369      /SYSV00000000 (deleted)
	nattch 2

That's +1 to nattch for each shmat() made.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-22 19:39:06 -07:00
..
allocpercpu.c
[PATCH] Allow NULL pointers in percpu_free
2006-12-07 08:39:22 -08:00
backing-dev.c
[PATCH] nfs: fix congestion control
2007-03-16 19:25:05 -07:00
bootmem.c
[PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols
2006-12-07 08:39:44 -08:00
bounce.c
[PATCH] blktrace: only add a bounce trace when we really bounce
2007-01-12 10:46:49 -08:00
fadvise.c
[PATCH] mm: change uses of f_{dentry,vfsmnt} to use f_path
2006-12-08 08:28:43 -08:00
filemap_xip.c
[PATCH] mm: mremap correct rmap accounting
2007-01-30 08:33:32 -08:00
filemap.c
[PATCH] dio: invalidate clean pages before dio write
2007-03-16 19:25:04 -07:00
filemap.h
Remove all inclusions of <linux/config.h>
2006-10-04 03:38:54 -04:00
fremap.c
[PATCH] mm: more rmap debugging
2006-12-22 08:55:49 -08:00
highmem.c
[PATCH] Use ZVC for free_pages
2007-02-11 10:51:17 -08:00
hugetlb.c
[PATCH] hugetlb: preserve hugetlb pte dirty state
2007-02-09 09:25:46 -08:00
internal.h
[PATCH] mm: VM_BUG_ON
2006-09-26 08:48:44 -07:00
Kconfig
[PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA
2007-02-11 10:51:19 -08:00
madvise.c
[PATCH] mm: fix madvise infinine loop
2007-03-16 19:25:04 -07:00
Makefile
[PATCH] separate bdi congestion functions from queue congestion functions
2006-10-20 10:26:35 -07:00
memory_hotplug.c
[PATCH] Fix sparsemem on Cell
2007-01-11 18:18:20 -08:00
memory.c
[PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn()
2007-02-12 09:48:27 -08:00
mempolicy.c
[PATCH] Page migration: Fix vma flag checking
2007-03-05 07:57:51 -08:00
mempool.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
migrate.c
[PATCH] Page migration: Fix vma flag checking
2007-03-05 07:57:51 -08:00
mincore.c
[PATCH] mincore: vma crossing fix
2007-02-15 09:57:03 -08:00
mlock.c
[PATCH] mlock cleanup
2006-12-07 08:39:22 -08:00
mmap.c
[PATCH] Bug in MM_RB debugging
2007-03-01 14:53:38 -08:00
mmzone.c
[PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols
2006-12-07 08:39:44 -08:00
mprotect.c
[PATCH] paravirt: lazy mmu mode hooks.patch
2006-10-01 00:39:33 -07:00
mremap.c
[PATCH] mm: mremap correct rmap accounting
2007-01-30 08:33:32 -08:00
msync.c
[PATCH] mm: msync() cleanup
2006-09-26 08:48:45 -07:00
nommu.c
[PATCH] NOMMU: make SYSV SHM nattch work correctly
2007-03-22 19:39:06 -07:00
oom_kill.c
[PATCH] oom fix: prevent oom from killing a process with children/sibling unkillable
2007-03-16 19:25:06 -07:00
page_alloc.c
[PATCH] Rename PG_checked to PG_owner_priv_1
2007-03-01 14:53:37 -08:00
page_io.c
[PATCH] swsusp: use block device offsets to identify swap locations
2006-12-07 08:39:27 -08:00
page-writeback.c
[PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations
2007-03-01 14:53:38 -08:00
pdflush.c
[PATCH] Add include/linux/freezer.h and move definitions from sched.h
2006-12-07 08:39:27 -08:00
prio_tree.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
readahead.c
[PATCH] Drop __get_zone_counts()
2007-02-11 10:51:18 -08:00
rmap.c
[PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU
2007-03-01 14:53:39 -08:00
shmem_acl.c
[PATCH] Fix typos in mm/shmem_acl.c
2006-10-11 11:14:23 -07:00
shmem.c
[PATCH] shmem and simple const super_operations
2007-03-05 07:57:51 -08:00
slab.c
[PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers)
2007-03-01 14:53:37 -08:00
slob.c
[PATCH] MM: SLOB is broken by recent cleanup of slab.h
2006-12-30 10:56:42 -08:00
sparse.c
[PATCH] numa node ids are int, page_to_nid and zone_to_nid should return int
2006-12-07 08:39:23 -08:00
swap_state.c
[PATCH] lockdep: locking init debugging improvement
2006-07-03 15:27:02 -07:00
swap.c
[PATCH] hotplug CPU: clean up hotcpu_notifier() use
2006-12-07 08:39:39 -08:00
swapfile.c
[PATCH] swsusp: Do not fail if resume device is not set
2007-01-05 23:55:22 -08:00
thrash.c
[PATCH] make mm/thrash.c:global_faults static
2006-12-07 08:39:22 -08:00
tiny-shmem.c
[PATCH] mm/{,tiny-}shmem.c cleanups
2007-03-01 14:53:35 -08:00
truncate.c
[PATCH] VM: invalidate_inode_pages2_range() should not exit early
2007-03-01 14:53:39 -08:00
util.c
[PATCH] slab: clean up leak tracking ifdefs a little bit
2006-10-04 07:55:13 -07:00
vmalloc.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
vmscan.c
[PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations
2007-03-01 14:53:38 -08:00
vmstat.c
[PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM
2007-02-11 10:51:18 -08:00