From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Mon, 1 Jun 2015 08:22:03 +0000 (+0800)
Subject: crypto: scatterwalk - Hide PageSlab call to optimise away flush_dcache_page
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~164^2~97
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=160544075f2a4028209721723a51f16add7b08b9;p=pandora-kernel.git

crypto: scatterwalk - Hide PageSlab call to optimise away flush_dcache_page

On architectures where flush_dcache_page is not needed, we will
end up generating all the code up to the PageSlab call.  This is
because PageSlab operates on a volatile pointer and thus cannot
be optimised away.

This patch works around this by checking whether flush_dcache_page
is needed before we call PageSlab which then allows PageSlab to be
compiled awy.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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