From: Emmanuel Michon <emmanuel_michon@realmagic.fr>
Date: 30 May 2002 13:05:26 +0200
"David S. Miller" <davem@redhat.com> writes:
> I'd rather see a patch to DMA-mapping.txt that specifies the memory
> returned is zeroed out, as this is what every implementation appears
> to do.
What was the idea when writing the code that zeroes memory? It seems
so useless.
Because 9 out of 10 drivers where I had to change virt_to_bus
into the portable pci_alloc_consistent were using get_free_pages()
which zeros things out for you.
I do actually remember that many of those instances in fact did
depend on the memory being zero'd for them, they weren't using the
"zero the pages too" variant instead of __get_free_pages()
gratuitously.
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