Date: Fri, 04 May 2007 14:40:32 -0700 From: Julian Elischer <julian@elischer.org> To: John Baldwin <jhb@freebsd.org> Cc: attilio@freebsd.org, freebsd-current@freebsd.org, Harald Schmalzbauer <h.schmalzbauer@omnisec.de> Subject: Re: PANIC: blockable slep lock (sx) msi @ ....msi.c:374 Message-ID: <463BA850.8000804@elischer.org> In-Reply-To: <200705041546.50690.jhb@freebsd.org> References: <463B7A1D.6020602@omnisec.de> <463BF1A7.1050504@FreeBSD.org> <200705041546.50690.jhb@freebsd.org>
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John Baldwin wrote: > > This is wrong because once you do critical_enter(), you are free to assume > that you won't do a context switch until you critical_exit(), and sx_xlock() > would violate that if it blocked on the lock. wellllll critical enter doesn't block interupts so it's true if you don't call an interrupt as a context switch. (it doesn't SWITCH contexts but it does step into a different context.) >
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