This patch series reworks the ARMv6/ARMv6K support options, code selection, and bit operations such that it's possible to safely build a kernel which supports ARMv6, ARMv6K, ARMv7 and ARMv7 SMP in one image. Currently, we use CPU_V6 for both ARMv6 and ARMv6K, setting CPU_32v6K if we have the K extensions. CPU_32v6K directly controlled whether we should include the ARMv6K instructions (clrex, load/store exclusive byte, half-word, double). As the bitops code uses the load/store exclusive byte operations, unsetting CPU_32v6K results in these falling back to their non-SMP local-irq-disabling variants. These are only safe in uniprocessor environments. So, the first two patches convert the bitops to use the ARMv6 load/store exclusive word operations - and ensuring correctness by ensuring that the pointer passed in is word-aligned. We then introduce a new CPU_V6K which indicates that we're including an ARMv6K CPU in the build, which frees up CPU_V6 to mean that we're including an ARMv6 non-K CPU. We can then use CPU_V6 to ensure that the non-v6K code paths which are still SMP safe are selected. Without this patch set, such a kernel will be unsafe when run on SMP platforms as it omits necessary SMP code to ensure that bit operations are safe. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
