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| author | Malahal Naineni <malahal@us.ibm.com> | 2010-09-24 20:25:49 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-24 20:27:16 +0200 |
| commit | c49825facfd4969585224a896a5e717f88450cad (patch) | |
| tree | 2c244fdf033f858147875333024838e493d9e43e | |
| parent | 4b1977698ceb4c4caa800d475127139da49966f9 (diff) | |
| download | linux-c49825facfd4969585224a896a5e717f88450cad.tar.bz2 | |
block: set the bounce_pfn to the actual DMA limit rather than to max memory
The bounce_pfn of the request queue in 64 bit systems is set to the
current max_low_pfn. Adding more memory later makes this incorrect.
Memory allocated beyond this boot time max_low_pfn appear to require
bounce buffers (bounce buffers are actually not allocated but used in
calculating segments that may result in "over max segments limit"
errors).
Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| -rw-r--r-- | block/blk-settings.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index f8f2ddf20613..f47af5031eaa 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -214,16 +214,14 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask) */ if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1; - q->limits.bounce_pfn = max_low_pfn; #else if (b_pfn < blk_max_low_pfn) dma = 1; - q->limits.bounce_pfn = b_pfn; #endif + q->limits.bounce_pfn = b_pfn; if (dma) { init_emergency_isa_pool(); q->bounce_gfp = GFP_NOIO | GFP_DMA; - q->limits.bounce_pfn = b_pfn; } } EXPORT_SYMBOL(blk_queue_bounce_limit); |