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Date: Fri, 4 Jun 2010 14:03:47 +0900 From: Paul Mundt <lethal@...ux-sh.org> To: David Miller <davem@...emloft.net> Cc: peterz@...radead.org, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, sparclinux@...r.kernel.org Subject: Re: [PATCH 1/4] kernel: local_irq_{save,restore}_nmi() On Fri, Apr 09, 2010 at 04:01:35PM -0700, David Miller wrote: > > Provide local_irq_{save,restore}_nmi() which will allow us to help > architectures that implement NMIs using IRQ priorities like SPARC64 > does. > > Sparc uses IRQ prio 15 for NMIs and implements local_irq_disable() as > disable <= 14. However if you do that while inside an NMI you re- > enable the NMI priority again, causing all kinds of fun. > > A more solid implementation would first check the disable level and > never lower it, however that is more costly and would slow down the > rest of the kernel for no particular reason. > > Therefore introduce local_irq_save_nmi() which can implement this > slower but more solid scheme and dis-allow local_irq_save() from NMI > context. > > Suggested-by: David Miller <davem@...emloft.net> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl> > Signed-off-by: David S. Miller <davem@...emloft.net> Are there any updates for this patch series? I would like to make use of this on SH as well, but it seems these haven't hit upstream yet. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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