Re: kernel virtual page locking..

Philip Blundell (pb@nexus.co.uk)
Fri, 30 Apr 1999 17:47:07 +0100

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>If I want to do a DMA operation in a character driver, i believe i have
>to use physical memory. ( by getting kvirt_to_phys() ).
>Is there a fear of this memory getting swapped out while the DMA
>operation is in progress.?

No. Kernel memory that works with virt_to_bus (ie that which was allocated
with kmalloc) is not swappable. Note that you almost certainly don't want to
use virt_to_phys() in this situation.

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