Messages in this thread | | | Subject | RE: [PATCH -mm] IOAT: fix for UP use of cpu_physical_id() | Date | Mon, 20 Aug 2007 16:21:44 -0700 | From | "Nelson, Shannon" <> |
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>-----Original Message----- >From: H. Peter Anvin [mailto:hpa@zytor.com] >Sent: Monday, August 20, 2007 3:27 PM >To: Nelson, Shannon >Cc: akpm@linux-foundation.org; linux-kernel@vger.kernel.org; >chris.leech@gmail.com; ak@suse.de; Luck, Tony >Subject: Re: [PATCH -mm] IOAT: fix for UP use of cpu_physical_id() > >Shannon Nelson wrote: >> Make sure we can use cpu_physical_id() even when compiled for >> uni-processor. >> >> diff --git a/drivers/dma/ioat_dca.c b/drivers/dma/ioat_dca.c >> index c3a500b..b1af49c 100644 >> --- a/drivers/dma/ioat_dca.c >> +++ b/drivers/dma/ioat_dca.c >> @@ -25,6 +25,14 @@ >> #include <linux/smp.h> >> #include <linux/interrupt.h> >> #include <linux/dca.h> >> + >> +// either a kernel change is needed, or we need something >like this in kernel >> +#ifndef CONFIG_SMP >> +#include <asm/smp.h> >> +#undef cpu_physical_id >> +#define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24) >> +#endif >> + > >This value should probably be cached. Executing cpuid to get a static >value seems like a bad idea.
Yeah, this whole cpu_physical_id() gizmo needs to be fixed so it is actually usable for non-SMP configurations. Unfortunately, I'm not the guy to do it.
sln -- ====================================================================== Mr. Shannon Nelson LAN Access Division, Intel Corp. Shannon.Nelson@intel.com I don't speak for Intel (503) 712-7659 Parents can't afford to be squeamish. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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