On Tue, 2012-10-09 at 16:39 +0100, Arnd Bergmann wrote: > On Tuesday 09 October 2012, Ian Campbell wrote: > > > * The tmem hypercall is not available on ARM > > > > > > * ARMv6 does not support cmpxchg on 16-bit words that are used in the > > > > missing the end of this sentence? > > Right, I meant to say > > * ARMv6 does not support cmpxchg on 16-bit words that are used in the > Xen grant table code, so we must ensure that Xen support is only built > on ARMv7-only kernels not combined ARMv6/v7 kernels. > > This should be fixed differently in the future.
Is this is a build time failure because gcc/gas/etc refuses to generate these instructions if it is configured for v6? I ask because if it is only a runtime issue then we can reason that if we are running Xen specific grant table code, then we must be running on Xen and therefore must necessarily be running on a v7 (because Xen only support v7+virt extensions) even if the kernel happens to be capable of running on v6 too. Ian. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/