[rfc-patch 11/11] Text Edit Lock - x86_64 standardize debug rodata

Mathieu Desnoyers
2007-11-16T20:06:09Z

[-- Attachment #1: text-edit-lock-x86_64-standardize-debug-rodata.patch --]
[-- Type: text/plain, Size: 1843 bytes --]

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: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
---
arch/x86_64/mm/init.c | 23 +++++------------------
1 file changed, 5 insertions(+), 18 deletions(-)

Index: linux-2.6-lttng/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6-lttng.orig/arch/x86/mm/init_64.c 2007-09-24 11:00:01.000000000 -0400
+++ linux-2.6-lttng/arch/x86/mm/init_64.c 2007-09-24 11:00:02.000000000 -0400
@@ -592,25 +592,11 @@ void free_initmem(void)

void mark_rodata_ro(void)
{
- unsigned long start = (unsigned long)_stext, end;
+ unsigned long start = PFN_ALIGN(_stext);
+ unsigned long end = PFN_ALIGN(__end_rodata);

-#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;
-
- change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO);
+ change_page_attr_addr(start, (end - start) >> PAGE_SHIFT,
+ PAGE_KERNEL_RO);

printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(end - start) >> 10);
@@ -623,6 +609,7 @@ void mark_rodata_ro(void)
*/
global_flush_tlb();
}
+
#endif

#ifdef CONFIG_BLK_DEV_INITRD