Date: Wed, 5 Mar 2014 13:54:02 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Ian Lepore <ian@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r262411 - head/sys/arm/arm Message-ID: <20140305115402.GC24664@kib.kiev.ua> In-Reply-To: <201402232252.s1NMqmI5075701@svn.freebsd.org> References: <201402232252.s1NMqmI5075701@svn.freebsd.org>
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--xhQBShgGdvjvx42z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Feb 23, 2014 at 10:52:48PM +0000, Ian Lepore wrote: > Author: ian > Date: Sun Feb 23 22:52:48 2014 > New Revision: 262411 > URL: http://svnweb.freebsd.org/changeset/base/262411 >=20 > Log: > If the L2 cache type is PIPT, pass a physical address for a flush. > =20 > While this is technically more correct, I don't think it much matters, > because the only thing in the tree that calls cpu_flush_dcache() is md(= 4) > and I'm > 99% sure it's bogus that it does so; md has no ability to do > anything that can perturb data cache coherency. Yes, md(4) does not break data cache coherency, but I think that Marcel added the flush to ensure instruction cache coherency. The intent was to ensure that harward-architecture machines would see up-to-date memory content when fetching instructions after read on md(4). --xhQBShgGdvjvx42z Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBAgAGBQJTFxBZAAoJEJDCuSvBvK1BLHEP/1P19Nj8Ix+PFP74iAdLbrJT PiWbqdSFz7CKCOO01IqAtk5z4uTt8ZryBvqy7TQjG0SY9eKE5nQBJIe1GI38rT1p G10M95a+UVjon574HtmpGRYqejMy2eemKlwwA71H44OOQQ2SJqCtxY6k+5YE2DU+ N7VSLAeA0Bt+BwDRLMH4VnC4HCfk8vEqrXEXX2SzTUQwkWW0XjwaEXatjfgrX2cU NiKh7l58JXWvz0rBDDcg1lknI1+Ew0gIA+MLCTAYyLaeNsfLA5CRy5epT2X9fOvX +ZlPOaxx50XeO+IQvCDky+/ZdyDKje/Rrwz9kNNI2P9lHwU2CTzjo6tVazulZzFl Pt29cI9TwChtDgsRy+IByCk7aXfolZZ5HMyO6ORUrS8etzKxIpz3M14fwCV9KHy7 PWdqkhfKvrfzVUaaGEufReRd/Y69fmKHYPwVq+A3CjWxvB73+aGEXVnRJ5CGZvOf fy3uV0CsqsJyOZ1UjvCOqg83MrTpUEqs4yEkfFFEvE7V5e9qIru4whzSccwMN330 ldKUAK9JZe7+jOIJ6bfcIEhAEPym3i3ofmANuxdicvCy4QvACyOUvh6i5ZglzSaP O3xxPQritLcjAT/ILKLyUHCdXggC/I1wfImf5Yc8MUOIAS84ZpZMoNEjMuadwNx2 3gDDm7CVlhWpMnzYz2i8 =eq31 -----END PGP SIGNATURE----- --xhQBShgGdvjvx42z--
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