Date: Tue, 4 Nov 2014 11:25:58 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alfred Perlstein <alfred@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Mateusz Guzik <mjg@FreeBSD.org> Subject: Re: svn commit: r274017 - head/sys/kern Message-ID: <20141104092558.GP53947@kib.kiev.ua> In-Reply-To: <5457F771.3010509@freebsd.org> References: <201411030746.sA37kpPu037113@svn.freebsd.org> <5457F771.3010509@freebsd.org>
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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.
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