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authorAndi Kleen <ak@suse.de>2008-01-30 13:33:42 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:33:42 +0100
commit0c42f392767d3592e1cf676857d398ef69be7c9c (patch)
tree0ae79fb0424ed9340ad973bea013251e05553be4 /arch/x86/mm/init_64.c
parentb4416a1be86b0c7bdde4e6ba526715c1a055746f (diff)
c_p_a(): do a simple self test at boot
When CONFIG_DEBUG_RODATA is enabled undo the ro mapping and redo it again. This gives some simple testing for change_page_attr(). Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 8198840c3dcb..0fd9d7f77786 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -606,6 +606,16 @@ void mark_rodata_ro(void)
* of who is the culprit.
*/
global_flush_tlb();
+
+#ifdef CONFIG_CPA_DEBUG
+ printk("Testing CPA: undo %lx-%lx\n", start, end);
+ change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL);
+ global_flush_tlb();
+
+ printk("Testing CPA: again\n");
+ change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO);
+ global_flush_tlb();
+#endif
}
#endif