diff options
| author | Andi Kleen <ak@suse.de> | 2006-06-29 20:54:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-07-24 20:35:19 -0700 |
| commit | 9f24916834aaa1a31d90505c671e4746471200bf (patch) | |
| tree | 08d9e3f1a05893433598e14c4ff52273b9b148e8 | |
| parent | 395e8c5b6b0a3ceaf5e95b79f327028a8a48f481 (diff) | |
BLOCK: Fix bounce limit address check
This fixes some OOMs on 64bit systems with <4GB of RAM when accessing
the cdrom.
Do a safer check for when to enable DMA. Currently we enable ISA DMA
for cases that do not need it, resulting in OOM conditions when ZONE_DMA
runs out of space.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | block/ll_rw_blk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 7eb36c53f4b7..4293143c93cf 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -638,7 +638,7 @@ void blk_queue_bounce_limit(request_queue_t *q, u64 dma_addr) /* Assume anything <= 4GB can be handled by IOMMU. Actually some IOMMUs can handle everything, but I don't know of a way to test this here. */ - if (bounce_pfn < (0xffffffff>>PAGE_SHIFT)) + if (bounce_pfn < (min_t(u64,0xffffffff,BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1; q->bounce_pfn = max_low_pfn; #else |