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Date: Sat, 9 Aug 2008 22:37:27 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: Suresh Siddha <suresh.b.siddha@...el.com> Cc: "H. Peter Anvin" <hpa@...or.com>, Wolfgang Walter <wolfgang.walter@...m.de>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, "viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>, "vegard.nossum@...il.com" <vegard.nossum@...il.com> Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes On Fri, Aug 08, 2008 at 04:11:21PM -0700, Suresh Siddha wrote: > > With out the recent dynamic fpu allocation changes, while we don't see oops, > there is a possible race still present in older kernels(for example, > while kernel is using kernel_fpu_begin() in some optimized clear/copy > page and an interrupt/softirq happens which uses these padlock > instructions generating DNA fault). No this wasn't a problem because kernel_fpu_begin clears TS and therefore we don't get faults on SSE instructions. However, with your patch it will become a problem due to the fact that it wasn't designed to be nested. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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