+#ifdef CONFIG_PPC64
+ unsigned long new_msr = 0;
+
+ if (new_ctx &&
+ __get_user(new_msr, &new_ctx->uc_mcontext.mc_gregs[PT_MSR]))
+ return -EFAULT;
+ /*
+ * Check that the context is not smaller than the original
+ * size (with VMX but without VSX)
+ */
+ if (ctx_size < UCONTEXTSIZEWITHOUTVSX)
+ return -EINVAL;
+ /*
+ * If the new context state sets the MSR VSX bits but
+ * it doesn't provide VSX state.
+ */
+ if ((ctx_size < sizeof(struct ucontext)) &&
+ (new_msr & MSR_VSX))
+ return -EINVAL;
+#ifdef CONFIG_VSX
+ /*
+ * If userspace doesn't provide enough room for VSX data,
+ * but current thread has used VSX, we don't have anywhere
+ * to store the full context back into.
+ */
+ if ((ctx_size < sizeof(struct ucontext)) &&
+ (current->thread.used_vsr && old_ctx))
+ return -EINVAL;
+#endif
+#else