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Date: Wed, 25 Aug 2010 15:16:50 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Lal <learner.kernel@...il.com> Cc: netdev@...r.kernel.org Subject: Re: RPS patch questions Le mercredi 25 août 2010 à 18:05 +0530, Lal a écrit : > I am evaluating RPS patch from Tom Herbert. I have some questions > regarding this patch. > > 1. Can __smp_call_function_single be called from bottom half handler? > I presume, yes. > right. > 2. I am working on 2.6.21 kernel which have neither > __smp_call_function_single nor smp_call_function_single. I used > smp_call_function_single from some other kernel version but this too > can not be called from bottom half handler (just like > smp_call_function). Did somebody try to write such function for 2.6.21 > (or older kernel) which can be called from bottom halves? 2.6.21 is too old for us ;) > > 3. One option I've is to upgrade to 2.6.27 kernel which has > __smp_call_function_single. I see a comment that this function must > not be called with interrupt disabled. Does it mean it can be called > from bottom half handler? > __smp_call_function_single must be called with hard irqs enabled. bottom half handlers (softirqs) do run with hard irqs enabled. -- 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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