Merge master.kernel.org:/home/rmk/linux-2.6-serial

[linux-2.6-omap-h63xx.git] / arch / i386 / mm / init.c

diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 06e26f0062382301e02c13a6c2fa24617a48b663..7df494b51a5b52b3b6b1fbdceabfbcb2d2934677 100644 (file)
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -735,6 +735,30 @@ void free_initmem(void)
        printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10);
 }
 
+#ifdef CONFIG_DEBUG_RODATA
+
+extern char __start_rodata, __end_rodata;
+void mark_rodata_ro(void)
+{
+       unsigned long addr = (unsigned long)&__start_rodata;
+
+       for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+               change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
+
+       printk ("Write protecting the kernel read-only data: %luk\n",
+                       (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+
+       /*
+        * change_page_attr() requires a global_flush_tlb() call after it.
+        * We do this after the printk so that if something went wrong in the
+        * change, the printk gets out at least to give a better debug hint
+        * of who is the culprit.
+        */
+       global_flush_tlb();
+}
+#endif
+
+
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {