-/**
- * change_page_attr - Change page table attributes in the linear mapping.
- * @page: First page to change
- * @numpages: Number of pages to change
- * @prot: New protection/caching type (PAGE_*)
- *
- * Returns 0 on success, otherwise a negated errno.
- *
- * This should be used when a page is mapped with a different caching policy
- * than write-back somewhere - some CPUs do not like it when mappings with
- * different caching policies exist. This changes the page attributes of the
- * in kernel linear mapping too.
- *
- * Caller must call global_flush_tlb() later to make the changes active.
- *
- * The caller needs to ensure that there are no conflicting mappings elsewhere
- * (e.g. in user space) * This function only deals with the kernel linear map.
- *
- * For MMIO areas without mem_map use change_page_attr_addr() instead.
- */
-int change_page_attr(struct page *page, int numpages, pgprot_t prot)
+static int change_page_attr_set_clr(unsigned long addr, int numpages,
+ pgprot_t mask_set, pgprot_t mask_clr)
+{
+ struct cpa_data cpa;
+ int ret, cache;
+
+ /*
+ * Check, if we are requested to change a not supported
+ * feature:
+ */
+ mask_set = canon_pgprot(mask_set);
+ mask_clr = canon_pgprot(mask_clr);
+ if (!pgprot_val(mask_set) && !pgprot_val(mask_clr))
+ return 0;
+
+ cpa.vaddr = addr;
+ cpa.numpages = numpages;
+ cpa.mask_set = mask_set;
+ cpa.mask_clr = mask_clr;
+ cpa.flushtlb = 0;
+
+ ret = __change_page_attr_set_clr(&cpa);
+
+ /*
+ * Check whether we really changed something:
+ */
+ if (!cpa.flushtlb)
+ return ret;
+
+ /*
+ * No need to flush, when we did not set any of the caching
+ * attributes:
+ */
+ cache = cache_attr(mask_set);
+
+ /*
+ * On success we use clflush, when the CPU supports it to
+ * avoid the wbindv. If the CPU does not support it and in the
+ * error case we fall back to cpa_flush_all (which uses
+ * wbindv):
+ */
+ if (!ret && cpu_has_clflush)
+ cpa_flush_range(addr, numpages, cache);
+ else
+ cpa_flush_all(cache);
+
+ return ret;
+}
+
+static inline int change_page_attr_set(unsigned long addr, int numpages,
+ pgprot_t mask)
+{
+ return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0));
+}
+
+static inline int change_page_attr_clear(unsigned long addr, int numpages,
+ pgprot_t mask)
+{
+ return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask);
+}
+
+int set_memory_uc(unsigned long addr, int numpages)
+{
+ return change_page_attr_set(addr, numpages,
+ __pgprot(_PAGE_PCD | _PAGE_PWT));
+}
+EXPORT_SYMBOL(set_memory_uc);
+
+int set_memory_wb(unsigned long addr, int numpages)
+{
+ return change_page_attr_clear(addr, numpages,
+ __pgprot(_PAGE_PCD | _PAGE_PWT));
+}
+EXPORT_SYMBOL(set_memory_wb);
+
+int set_memory_x(unsigned long addr, int numpages)
+{
+ return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_NX));
+}
+EXPORT_SYMBOL(set_memory_x);
+
+int set_memory_nx(unsigned long addr, int numpages)
+{
+ return change_page_attr_set(addr, numpages, __pgprot(_PAGE_NX));
+}
+EXPORT_SYMBOL(set_memory_nx);
+
+int set_memory_ro(unsigned long addr, int numpages)
+{
+ return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_RW));
+}
+
+int set_memory_rw(unsigned long addr, int numpages)
+{
+ return change_page_attr_set(addr, numpages, __pgprot(_PAGE_RW));
+}
+
+int set_memory_np(unsigned long addr, int numpages)
+{
+ return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_PRESENT));
+}
+
+int set_pages_uc(struct page *page, int numpages)