On 02/03/2010 11:40 AM, James Bottomley wrote:
The fix to libata looks to be just that it should kmap all the time rather than trying to fiddle with the page to see if its higmem. For kmap on a normal page, we should just return the offset map address and do all the flushing.
libata tests PageHighMem() because it was measurably faster to do things the current way (which includes local_irq_save/restore, only for highmem) on boxes where it actually matters.
It seems more efficient to add a flush where necessary, than unconditionally punish everyone...
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