tree 73cdbaa2517bc6dcab4621d5de2be09949e48c55
parent 2787f959d6c5fb258d964218ac75346019f49ee9
author Robert Jennings <rcj@linux.vnet.ibm.com> 1296226915 -0600
committer Greg Kroah-Hartman <gregkh@suse.de> 1296854952 -0800

zram/xvmalloc: combine duplicate block delete code

This patch eliminates duplicate code.  The remove_block_head function
is a special case of remove_block which can be contained in remove_block
without confusion.

The portion of code in remove_block_head which was noted as "DEBUG ONLY"
is now mandatory.  Doing this provides consistent management of the double
linked list of blocks under a freelist and makes this consolidation
of delete block code safe.  The first and last blocks will have NULL
pointers in their previous and next page pointers respectively.

Additionally, any time a block is removed from a free list the next and
previous pointers will be set to NULL to avoid misuse outside xvmalloc.

Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>