Date: Tue, 4 Nov 2014 06:23:34 -0800 From: Alfred Perlstein <bright@mu.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Alfred Perlstein <alfred@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org>, Mateusz Guzik <mjg@FreeBSD.org> Subject: Re: svn commit: r274017 - head/sys/kern Message-ID: <E513A7CD-FA5C-4BC2-ACA1-03370948ECE9@mu.org> In-Reply-To: <88CC9FA2-D677-484A-8D6B-9DA66D8479AE@mu.org> References: <201411030746.sA37kpPu037113@svn.freebsd.org> <5457F771.3010509@freebsd.org> <20141104092558.GP53947@kib.kiev.ua> <88CC9FA2-D677-484A-8D6B-9DA66D8479AE@mu.org>
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> On Nov 4, 2014, at 6:22 AM, Alfred Perlstein <bright@mu.org> wrote: > > > >>> On Nov 4, 2014, at 1:25 AM, Konstantin Belousov <kostikbel@gmail.com> wrote: >>> >>> On Mon, Nov 03, 2014 at 01:45:21PM -0800, Alfred Perlstein wrote: >>> Isn't there a problem where the stack can be swapped out? >>> >>> I seem to recall a problem where a swapped out process was causing >>> problems due to a buffer passed being stack allocated and that process >>> being swapped out... >>> >>> If this is not the case then please disregard. >> >> Sure, stack can be swapped out, but buffer passing is usually not a problem. >> At least, I am not aware of cases. >> >> In fact, many compat layers do exactly this, allocate the native-ABI >> structure on the stack, copyin the foreighn-ABI structure in pieces >> into the native-ABI one, and pass native to kern_foo() implementations. >> >> So I think you worries are not realized. > > Ok then as long as system will not pass this buffer as Dma target down to driver we are ok. Also thank you for explanation.help
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