From: davej@redhat.com
If the CPU doesn't support MTRRs, don't create a /proc/mtrr
---
arch/i386/kernel/cpu/mtrr/if.c | 8 ++++++++
1 files changed, 8 insertions(+)
diff -puN arch/i386/kernel/cpu/mtrr/if.c~restore-24-mtrr-feature arch/i386/kernel/cpu/mtrr/if.c
--- 25/arch/i386/kernel/cpu/mtrr/if.c~restore-24-mtrr-feature 2004-01-22 22:53:39.000000000 -0800
+++ 25-akpm/arch/i386/kernel/cpu/mtrr/if.c 2004-01-22 22:53:39.000000000 -0800
@@ -352,6 +352,14 @@ static int mtrr_seq_show(struct seq_file
static int __init mtrr_if_init(void)
{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
+ (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
+ (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
+ (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
+ return -ENODEV;
+
proc_root_mtrr =
create_proc_entry("mtrr", S_IWUSR | S_IRUGO, &proc_root);
if (proc_root_mtrr) {
_