Rusty Russell wrote:
On Tue, 2006-11-07 at 16:22 -0800, Jeremy Fitzhardinge wrote:
kunmap_atomic() will call kpte_clear_flush with vaddr/ptep arguments
which don't correspond if the vaddr is just a normal lowmem address
(ie, not in the KMAP area). This patch makes sure that the pte is
only cleared if kmap area was actually used for the mapping.
Or in other words, if kmap_atomic() does nothing, kunmap_atomic() should
do nothing.
Sure. I guess there's no particular reason why kmap_atomic() couldn't
always map, but I guess avoid the pagetable updates is worthwhile.
J
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