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authorAndrea Arcangeli <andrea@qumranet.com>2008-04-02 09:06:44 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-04-02 09:06:44 +0200
commit00d61e3e8c12d5f395b167856d2b3c430816afb0 (patch)
tree757df09b076810b40ee3431a394882a2be860a68 /block/cfq-iosched.c
parentLinux 2.6.25-rc8 (diff)
downloadlinux-00d61e3e8c12d5f395b167856d2b3c430816afb0.tar.xz
linux-00d61e3e8c12d5f395b167856d2b3c430816afb0.zip
Fix bounce setting for 64-bit
Looking a bit closer into this regression the reason this can't be right is that dma_addr common default is BLK_BOUNCE_HIGH and most machines have less than 4G. So if you do: if (b_pfn <= (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1 that will translate to: if (BLK_BOUNCE_HIGH <= BLK_BOUNCE_HIGH) dma = 1 So for 99% of hardware this will trigger unnecessary GFP_DMA allocations and isa pooling operations. Also note how the 32bit code still does b_pfn < blk_max_low_pfn. I guess this is what you were looking after. I didn't verify but as far as I can tell, this will stop the regression with isa dma operations at boot for 99% of blkdev/memory combinations out there and I guess this fixes the setups with >4G of ram and 32bit pci cards as well (this also retains symmetry with the 32bit code). Signed-off-by: Andrea Arcangeli <andrea@qumranet.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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