Messages in this thread | | | Date | Wed, 29 Jan 2020 09:09:39 -0800 | From | Christoph Hellwig <> | Subject | Re: [kernel-hardening] [PATCH 09/38] usercopy: Mark kmalloc caches as usercopy caches |
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On Wed, Jan 29, 2020 at 06:07:14PM +0100, Christian Borntraeger wrote: > > DMA can be done to NORMAL memory as well. > > Exactly. > I think iucv uses GFP_DMA because z/VM needs those buffers to reside below 2GB (which is ZONA_DMA for s390).
The normal way to allocate memory with addressing limits would be to use dma_alloc_coherent and friends. Any chance to switch iucv over to that? Or is there no device associated with it?
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