diff options
| -rw-r--r-- | arch/x86/mm/pageattr.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 40b7ac58e671..3810f7a83b1d 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -243,6 +243,17 @@ static int try_preserve_large_page(pte_t *kpte, unsigned long address, pgprot_t old_prot, new_prot; int level, res = CPA_SPLIT; + /* + * 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 res; + spin_lock_irqsave(&pgd_lock, flags); /* * Check for races, another CPU might have split this page |