On Fri, Jan 28, 2011 at 09:46:06AM +0000, Catalin Marinas wrote: > Does this mean that we could still configure a kernel to run on CPU_V6 > with domains disabled? The vectors page becomes read-only and setting > the TLS would fail.
Yes it will, so that's not acceptable either. > My point is that we may want SWP_EMULATE disabled (or depending on ! > CPU_USE_DOMAINS). With domains enabled every read-only user page is > writeable by the kernel. This has the side-effect that SWP emulation > using LDREX/STREX breaks COW. Yes, and maybe we should instead just enable the SWP instruction by default on ARMv7, and if SWP emulation is built, disable it at that point. > We could change early_trap_init() to always use the vectors_page rather > than the high mapping and determine at run-time (patch the code) whether > set_pte_ext sets R/W kernel permissions for RO user pages. With aliasing caches that becomes much more difficult. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
