x86, mm: Report state of NX protections during boot

It is possible for x86_64 systems to lack the NX bit either due to the
hardware lacking support or the BIOS having turned off the CPU capability,
so NX status should be reported.  Additionally, anyone booting NX-capable
CPUs in 32bit mode without PAE will lack NX functionality, so this change
provides feedback for that case as well.

Signed-off-by: Kees Cook <kees.cook@canonical.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <1258154897-6770-6-git-send-email-hpa@zytor.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 27ec2c23fd47..d406c5239019 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -146,10 +146,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         use_gbpages = direct_gbpages;
 #endif
 
-        /* XXX: replace this with Kees' improved messages */
-        if (__supported_pte_mask & _PAGE_NX)
-                printk(KERN_INFO "NX (Execute Disable) protection: active\n");
-
         /* Enable PSE if available */
         if (cpu_has_pse)
                 set_in_cr4(X86_CR4_PSE);