diff options
| author | Christoph Lameter <clameter@sgi.com> | 2007-06-08 22:46:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-09 02:23:33 +0200 |
| commit | 272c1d21d6fe42979068e14c04fb60fb6045ad74 (patch) | |
| tree | 6a365c67ed8575d15a59aa2183df609368359724 /Documentation/accounting | |
| parent | potential parse error in ifdef part 3 (diff) | |
| download | linux-272c1d21d6fe42979068e14c04fb60fb6045ad74.tar.xz linux-272c1d21d6fe42979068e14c04fb60fb6045ad74.zip | |
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>
Diffstat (limited to 'Documentation/accounting')
0 files changed, 0 insertions, 0 deletions