Re: [PATCHv8 00/12] Contiguous Memory Allocator

[Michal Nazarewicz <mina86@xxxxxxxxxx>]

Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> writes:
> Has anyone addressed my issue with it that this is wide-open for
> abuse by allocating large chunks of memory, and then remapping
> them in some way with different attributes, thereby violating the
> ARM architecture specification?
>
> In other words, do we _actually_ have a use for this which doesn't
> involve doing something like allocating 32MB of memory from it,
> remapping it so that it's DMA coherent, and then performing DMA
> on the resulting buffer?

Huge pages.

Also, don't treat it as coherent memory and just flush/clear/invalidate
cache before and after each DMA transaction.  I never understood what's
wrong with that approach.

-- 
Best regards,                                         _     _
 .o. | Liege of Serenly Enlightened Majesty of      o' \,=./ `o
 ..o | Computer Science,  Michal "mina86" Nazarewicz   (o o)
 ooo +--<mina86-tlen.pl>--<jid:mina86-jabber.org>--ooO--(_)--Ooo--
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html