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linux/mm
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Christoph Lameter 272c1d21d6 SLUB: return ZERO_SIZE_PTR for kmalloc(0) 
Instead of returning the smallest available object return ZERO_SIZE_PTR.

A ZERO_SIZE_PTR can be legitimately used as an object pointer as long as it
is not deferenced.  The dereference of ZERO_SIZE_PTR causes a distinctive
fault.  kfree can handle a ZERO_SIZE_PTR in the same way as NULL.

This enables functions to use zero sized object. e.g. n = number of objects.

	objects = kmalloc(n * sizeof(object));

	for (i = 0; i < n; i++)
		objects[i].x = y;

	kfree(objects);

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-06-08 17:23:33 -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 block: blk_max_pfn is somtimes wrong 2007-03-27 08:52:47 +02:00
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 Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
filemap.c Fix: find_or_create_page skips cpuset memory spreading. 2007-05-16 21:19:15 -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] i386: PARAVIRT: add kmap_atomic_pte for mapping highpte pages 2007-05-02 19:27:15 +02:00
hugetlb.c pretend cpuset has some form of hugetlb page reservation 2007-05-09 12:30:49 -07:00
internal.h Make page->private usable in compound pages 2007-05-07 12:12:53 -07:00
Kconfig sh64: generic quicklist support. 2007-05-14 09:55:35 +09:00
madvise.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
Makefile Quicklists for page table pages 2007-05-07 12:12:54 -07:00
memory_hotplug.c memory hotplug: fix unnecessary calling of init_currenty_empty_zone() 2007-06-01 08:18:29 -07:00
memory.c mm: more rmap checking 2007-05-17 05:23:06 -07:00
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 page migration: fix NR_FILE_PAGES accounting 2007-04-24 08:23:08 -07:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
mmap.c Fix occurrences of "the the " 2007-05-09 08:57:56 +02:00
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 Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nommu.c move die notifier handling to common code 2007-05-08 11:15:04 -07:00
oom_kill.c oom: fix constraint deadlock 2007-05-07 12:12:55 -07:00
page_alloc.c m68k: discontinuous memory support 2007-05-31 07:58:14 -07:00
page_io.c [PATCH] swsusp: use block device offsets to identify swap locations 2006-12-07 08:39:27 -08:00
page-writeback.c consolidate generic_writepages and mpage_writepages 2007-05-11 08:29:35 -07:00
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
quicklist.c Quicklists for page table pages 2007-05-07 12:12:54 -07:00
readahead.c readahead: code cleanup 2007-05-07 12:12:52 -07:00
rmap.c mm: more rmap checking 2007-05-17 05:23:06 -07:00
shmem_acl.c [PATCH] Fix typos in mm/shmem_acl.c 2006-10-11 11:14:23 -07:00
shmem.c mount -t tmpfs -o mpol=: check nodes online 2007-06-08 17:23:32 -07:00
slab.c slab: fix alien cache handling 2007-06-08 17:23:32 -07:00
slob.c Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
slub.c SLUB: return ZERO_SIZE_PTR for kmalloc(0) 2007-06-08 17:23:33 -07:00
sparse.c x86_64: allocate sparsemem memmap above 4G 2007-06-01 08:18:27 -07:00
swap_state.c [PATCH] lockdep: locking init debugging improvement 2006-07-03 15:27:02 -07:00
swap.c Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
swapfile.c mm: make read_cache_page synchronous 2007-05-07 12:12:51 -07:00
thrash.c Bug in mm/thrash.c function grab_swap_token() 2007-05-11 08:29:32 -07:00
tiny-shmem.c [PATCH] mm/{,tiny-}shmem.c cleanups 2007-03-01 14:53:35 -08:00
truncate.c fs: convert core functions to zero_user_page 2007-05-09 12:30:55 -07:00
util.c [PATCH] slab: clean up leak tracking ifdefs a little bit 2006-10-04 07:55:13 -07:00
vmalloc.c Make __vunmap static 2007-05-17 05:23:04 -07:00
vmscan.c Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
vmstat.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00