Russell King Oracle [off-list ref] wrote:

I think you need to be careful - I seem to have a recollection that the
reason we ended up with flush_kernel_dcache_page() was the need to avoid
the taking of the mmap lock for 32-bit ARM VIVT based CPUs in
flush_dcache_page(). 32-bit ARM flush_dcache_page() can block.

If you're sure that all these changes you're making do not end up
calling flush_dcache_page() from a path where we are atomic, then fine.

The Crypto API has been calling flush_dcache_page from softirq
context since before the advent of git (see crypto/scatterwalk.c
from the initial import).  So if 32-bit ARM blocks on it then this
has been broken for almost 20 years.

Cheers,
-- 
Email: Herbert Xu [off-list ref]
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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