x86: remove X2 workaround

With the spurious handler fix, the X2 does not lock up anymore.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 16ce841..c870424 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -260,17 +260,6 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
        pgprot_t old_prot, new_prot;
        int level, do_split = 1;
 
-       /*
-        * An Athlon 64 X2 showed hard hangs if we tried to preserve
-        * largepages and changed the PSE entry from RW to RO.
-        *
-        * As AMD CPUs have a long series of erratas in this area,
-        * (and none of the known ones seem to explain this hang),
-        * disable this code until the hang can be debugged:
-        */
-       if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
-               return 1;
-
        spin_lock_irqsave(&pgd_lock, flags);
        /*
         * Check for races, another CPU might have split this page