kernel/mm/dmapool.c, branch linux-2.6.36.y

dmapools: protect page_list walk in show_pools()

2009-07-01T01:56:00Z

show_pools() walks the page_list of a pool w/o protection against the list modifications in alloc/free. Take pool->lock to avoid stomping into nirvana. Signed-off-by: Thomas Gleixner Signed-off-by: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dmapool: enable debugging for CONFIG_SLUB_DEBUG_ON too

2008-04-28T15:58:20Z

Previously it was only enabled for CONFIG_DEBUG_SLAB. Not hooked into the slub runtime debug configuration, so you currently only get it with CONFIG_SLUB_DEBUG_ON, not plain CONFIG_SLUB_DEBUG Acked-by: Matthew Wilcox Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

pool: Improve memory usage for devices which can't cross boundaries

2007-12-04T15:39:58Z

The previous implementation simply refused to allocate more than a boundary's worth of data from an entire page. Some users didn't know this, so specified things like SMP_CACHE_BYTES, not realising the horrible waste of memory that this was. It's fairly easy to correct this problem, just by ensuring we don't cross a boundary within a page. This even helps drivers like EHCI (which can't cross a 4k boundary) on machines with larger page sizes. Signed-off-by: Matthew Wilcox Acked-by: David S. Miller

Change dmapool free block management

2007-12-04T15:39:57Z

Use a list of free blocks within a page instead of using a bitmap. Update documentation to reflect this. As well as being a slight reduction in memory allocation, locked ops and lines of code, it speeds up a transaction processing benchmark by 0.4%. Signed-off-by: Matthew Wilcox

dmapool: Tidy up includes and add comments

2007-12-04T15:39:57Z

We were missing a copyright statement and license, so add GPLv2, David Brownell's copyright and my copyright. The asm/io.h include was superfluous, but we were missing a few other necessary includes. Signed-off-by: Matthew Wilcox

dmapool: Validate parameters to dma_pool_create

2007-12-04T15:39:56Z

Check that 'align' is a power of two, like the API specifies. Align 'size' to 'align' correctly -- the current code has an off-by-one. The ALIGN macro in kernel.h doesn't. Signed-off-by: Matthew Wilcox Acked-by: David S. Miller

Avoid taking waitqueue lock in dmapool

2007-12-04T15:39:56Z

With one trivial change (taking the lock slightly earlier on wakeup from schedule), all uses of the waitq are under the pool lock, so we can use the locked (or __) versions of the wait queue functions, and avoid the extra spinlock. Signed-off-by: Matthew Wilcox Acked-by: David S. Miller

dmapool: Fix style problems

2007-12-04T15:39:55Z

Run Lindent and fix all issues reported by checkpatch.pl Signed-off-by: Matthew Wilcox

Move dmapool.c to mm/ directory

2007-12-04T15:39:54Z

Signed-off-by: Matthew Wilcox