x86: enhance DEBUG_RODATA support for hotplug and kprobes

Standardize DEBUG_RODATA, removing special cases for hotplug and kprobes.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: pageexec@freemail.hu
Cc: akpm@linux-foundation.org
CC: Andi Kleen <andi@firstfloor.org>
CC: pageexec@freemail.hu
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 18 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ae66d8d4c58d..4cb6c7f80f07 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -635,24 +635,7 @@ EXPORT_SYMBOL_GPL(rodata_test_data);
 
 void mark_rodata_ro(void)
 {
-        unsigned long start = (unsigned long)_stext, end;
-
-#ifdef CONFIG_HOTPLUG_CPU
-        /* It must still be possible to apply SMP alternatives. */
-        if (num_possible_cpus() > 1)
-                start = (unsigned long)_etext;
-#endif
-
-#ifdef CONFIG_KPROBES
-        start = (unsigned long)__start_rodata;
-#endif
-
-        end = (unsigned long)__end_rodata;
-        start = (start + PAGE_SIZE - 1) & PAGE_MASK;
-        end &= PAGE_MASK;
-        if (end <= start)
-                return;
-
+        unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
 
         printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
                (end - start) >> 10);
@@ -675,6 +658,7 @@ void mark_rodata_ro(void)
         set_memory_ro(start, (end-start) >> PAGE_SHIFT);
 #endif
 }
+
 #endif
 
 #ifdef CONFIG_BLK_DEV_INITRD