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Date: Fri, 18 Jun 2010 15:07:10 +0200 From: Tejun Heo <tj@...nel.org> To: Cliff Wickman <cpw@....com> CC: linux-kernel@...r.kernel.org Subject: Re: [PATCH] percpu: fix first chunk match in per_cpu_ptr_to_phys() On 06/18/2010 02:30 PM, Cliff Wickman wrote: > On Fri, Jun 18, 2010 at 11:56:16AM +0200, Tejun Heo wrote: >> per_cpu_ptr_to_phys() determines whether the passed in @addr belongs >> to the first_chunk or not by just matching the address against the >> address range of the base unit (unit0, used by cpu0). When an adress >> from another cpu was passed in, it will always determine that the >> address doesn't belong to the first chunk even when it does. This >> makes the function return a bogus physical address which may lead to >> crash. >> >> This problem was discovered by Cliff Wickman while investigating a >> crash during kdump on a SGI UV system. >> >> Signed-off-by: Tejun Heo <tj@...nel.org> >> Reported-by: Cliff Wickman <cpw@....com> >> --- >> Can you please verify this one? I added a small optimization so that >> it doesn't suck too bad on large machines and it works fine here but >> it would be great to have your Tested-by:. > > Yep. Works fine on 32p UV. > > Tested-by: Cliff Wickman <cpw@....com> Great, thanks. Will push it to mainline and -stable. -- tejun -- 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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