On Tue, Mar 06, 2007 at 04:25:41PM -0800, Andrew Morton wrote: > On Wed, 28 Feb 2007 15:25:54 +0100 > "Joerg Roedel" <[EMAIL PROTECTED]> wrote: > > > From: Joerg Roedel <[EMAIL PROTECTED]> > > > > This patch simplifies the get_cycles_sync() function by removing the > > #ifdefs from it. Further it introduces an optimization for AMD > > processors. There the RDTSCP instruction is used instead of CPUID;RDTSC > > which is helpfull if the kernel runs as a KVM guest. Running as a guest > > makes CPUID very expensive because it causes an intercept of the guest. > > Problem: > > http://test.kernel.org/functional/index.html > > lots of builds fell over because their binutils versions don't understand > rdtscp. > > I don't know how recently rdtscp support was added to binutils, but > this is likely to be a problem. Perhaps we can change this patch to > embed the hex code for that opcode instead?
Ok, I will submit an updated version soon. Thanks for pointing this out. Joerg -- Joerg Roedel Operating System Research Center AMD Saxony LLC & Co. KG - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
