linux.git/drivers/staging/zram/xvmalloc.c, branch v3.0

staging: Allow sharing xvmalloc for zram and zcache

2011-02-23T22:02:56+00:00

Both zram and zcache use xvmalloc allocator. If xvmalloc
is compiled separately for both of them, we will get linker
error if they are both selected as "built-in". We can also
get linker error regarding missing xvmalloc symbols if zram
is not built.

So, we now compile xvmalloc separately and export its symbols
which are then used by both of zram and zcache.

Signed-off-by: Nitin Gupta 
Acked-by: Randy Dunlap 
Signed-off-by: Greg Kroah-Hartman

zram/xvmalloc: combine duplicate block delete code

2011-02-04T21:29:12+00:00

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 
Reviewed-by: Pekka Enberg 
Acked-by: Nitin Gupta 
Signed-off-by: Greg Kroah-Hartman

zram/xvmalloc: create CONFIG_ZRAM_DEBUG for debug code

2011-02-04T21:29:11+00:00

Add a debug config flag to enable debug printk output and future
debug code.

Signed-off-by: Robert Jennings 
Reviewed-by: Pekka Enberg 
Signed-off-by: Greg Kroah-Hartman

zram/xvmalloc: free bit block insertion optimization

2011-02-04T21:29:11+00:00

This change is in a conditional block which is entered only when there is
an existing data block on the freelist where the insert has taken place.

The new block is pushed onto the freelist stack and this conditional block
is updating links in the prior stack head to point to the new stack head.
After this conditional block the first-/second-level indices are updated
to indicate that there is a free block at this location.

This patch adds an immediate return from the conditional block to avoid
setting bits again to indicate a free block on this freelist. The bits
would already be set because there was an existing free block on this
freelist.

Signed-off-by: Robert Jennings 
Reviewed-by: Pekka Enberg 
Signed-off-by: Greg Kroah-Hartman

staging:zram:xvmalloc.c Fix a typo.

2011-01-21T00:08:23+00:00

Not exactly sure if this is a typo or not, due to my search
results comming up with not that many hits. Either its dereferenceable
or dereferencable from the two I choose the later. if it's wrong let me know
and I'll resend.

Signed-off-by: Justin P. Mattock 
Signed-off-by: Greg Kroah-Hartman

staging/zram: Fix sparse warning 'Using plain integer as NULL pointer'

2010-12-08T22:31:02+00:00

This patch fixes the warning generated by sparse: "Using plain integer
as NULL pointer" by replacing the offending 0s with NULL.

Signed-off-by: Peter Huewe 
Signed-off-by: Greg Kroah-Hartman

Staging: Rename ramzswap files to zram

2010-06-18T19:46:42+00:00

Related changes:
 - Modify revelant Kconfig and Makefile accordingly.
 - Change include filenames in code.
 - Remove dependency on CONFIG_SWAP in Kconfig as zram usage
is no longer limited to swap disks.

Signed-off-by: Nitin Gupta 
Acked-by: Pekka Enberg 
Signed-off-by: Greg Kroah-Hartman