[PATCH] ppc64: Fix CONFIG_ALTIVEC not set

The code that sets the altivec capability of the CPU based on firmware
informations can enable altivec when the kernel has CONFIG_ALTIVEC
disabled.  This results in "interesting" crashes.

Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/arch/ppc64/kernel/prom.c b/arch/ppc64/kernel/prom.c
index 47727a6f734623c89a14d5b0d61593bdcacafa74..5aca01ddd81ff44272b896849dbc128d7d2bbb0a 100644 (file)
--- a/arch/ppc64/kernel/prom.c
+++ b/arch/ppc64/kernel/prom.c
@@ -916,6 +916,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
                }
        }
 
+#ifdef CONFIG_ALTIVEC
        /* Check if we have a VMX and eventually update CPU features */
        prop = (u32 *)get_flat_dt_prop(node, "ibm,vmx", NULL);
        if (prop && (*prop) > 0) {
@@ -929,6 +930,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
                cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
                cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
        }
+#endif /* CONFIG_ALTIVEC */
 
        /*
         * Check for an SMT capable CPU and set the CPU feature. We do