Date: Tue, 19 Jun 2012 09:00:59 +0100 From: "Robert N. M. Watson" <robert.watson@cl.cam.ac.uk> To: Brooks Davis <brooks@freebsd.org> Cc: Perforce Change Reviews <perforce@freebsd.org> Subject: Re: PERFORCE change 213107 for review Message-ID: <034862BE-2DD0-490B-9ADC-283C684B8047@cl.cam.ac.uk> In-Reply-To: <201206190029.q5J0TY7n041524@skunkworks.freebsd.org> References: <201206190029.q5J0TY7n041524@skunkworks.freebsd.org>
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On 19 Jun 2012, at 01:29, Brooks Davis wrote: > Change 213107 by brooks@brooks_ecr_current on 2012/06/19 00:28:56 >=20 > Allow non-PAGE_SIZE sized and aligned regions as long as they = are > smaller than a page. This allows us to provide trivial access = to things > like the buttons and switches bytes. For the regular read(2)/write(2) interface, non-page-aligned and -sized = regions are fine, but for mmap(2) they are problematic. Perhaps we = should allow them only if mmap(2) access isn't requested in the = device.hints configuration -- or at least device_printf() a warning = about mmap(2) being disallowed? Robert=
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