x86: ifdef 32-bit specific setup in init_memory_mapping()

Impact: cleanup

Enabling NX, PSE, and PGE are only required on 32-bit so ifdef them
in both versions of the function.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1236257708-27269-5-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 151e5ba34412..c3c0be5b6373 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -712,6 +712,24 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         use_gbpages = direct_gbpages;
 #endif
 
+#ifdef CONFIG_X86_32
+#ifdef CONFIG_X86_PAE
+        set_nx();
+        if (nx_enabled)
+                printk(KERN_INFO "NX (Execute Disable) protection: active\n");
+#endif
+
+        /* Enable PSE if available */
+        if (cpu_has_pse)
+                set_in_cr4(X86_CR4_PSE);
+
+        /* Enable PGE if available */
+        if (cpu_has_pge) {
+                set_in_cr4(X86_CR4_PGE);
+                __supported_pte_mask |= _PAGE_GLOBAL;
+        }
+#endif
+
         if (use_gbpages)
                 page_size_mask |= 1 << PG_LEVEL_1G;
         if (use_pse)