On Fri, Jun 11, 2021 at 09:07:43PM -0700, Ira Weiny wrote:
>
> More recently this was added:
>
> 7e34e0bbc644 crypto: omap-crypto - fix userspace copied buffer access
>
> I'm CC'ing Tero and Herbert to see why they added the SLAB check.
Probably because the generic Crypto API has the same check. This
all goes back to
commit 4f3e797ad07d52d34983354a77b365dfcd48c1b4
Author: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Mon Feb 9 14:22:14 2009 +1100
crypto: scatterwalk - Avoid flush_dcache_page on slab pages
It's illegal to call flush_dcache_page on slab pages on a number
of architectures. So this patch avoids doing so if PageSlab is
true.
In future we can move the flush_dcache_page call to those page
cache users that actually need it.
Reported-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
But I can't find any emails discussing this so let me ask Dave
directly and see if he can tell us what the issue was or might
have been.
Thanks,
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
