Merge branch 'rfc/splice/tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux...

[linux-2.6-omap-h63xx.git] / arch / x86 / mm / init_32.c

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 2cef050744131698ff7239192b04a7ba136d9153..3eb2ed188a4cbb85cb0b1adceeceb85541a9d177 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -1155,17 +1155,47 @@ static noinline int do_test_wp_bit(void)
 const int rodata_test_data = 0xC3;
 EXPORT_SYMBOL_GPL(rodata_test_data);
 
+static int kernel_set_to_readonly;
+
+void set_kernel_text_rw(void)
+{
+       unsigned long start = PFN_ALIGN(_text);
+       unsigned long size = PFN_ALIGN(_etext) - start;
+
+       if (!kernel_set_to_readonly)
+               return;
+
+       pr_debug("Set kernel text: %lx - %lx for read write\n",
+                start, start+size);
+
+       set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
+}
+
+void set_kernel_text_ro(void)
+{
+       unsigned long start = PFN_ALIGN(_text);
+       unsigned long size = PFN_ALIGN(_etext) - start;
+
+       if (!kernel_set_to_readonly)
+               return;
+
+       pr_debug("Set kernel text: %lx - %lx for read only\n",
+                start, start+size);
+
+       set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
+}
+
 void mark_rodata_ro(void)
 {
        unsigned long start = PFN_ALIGN(_text);
        unsigned long size = PFN_ALIGN(_etext) - start;
 
-#ifndef CONFIG_DYNAMIC_FTRACE
-       /* Dynamic tracing modifies the kernel text section */
        set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
        printk(KERN_INFO "Write protecting the kernel text: %luk\n",
                size >> 10);
 
+       kernel_set_to_readonly = 1;
+
 #ifdef CONFIG_CPA_DEBUG
        printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n",
                start, start+size);
@@ -1174,7 +1204,6 @@ void mark_rodata_ro(void)
        printk(KERN_INFO "Testing CPA: write protecting again\n");
        set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
 #endif
-#endif /* CONFIG_DYNAMIC_FTRACE */
 
        start += size;
        size = (unsigned long)__end_rodata - start;