On Fri, 26 Feb 2010, Dan Carpenter wrote:
> kernel/trace/latency_hist.c
> 341 static ssize_t
> 342 latency_hist_reset(struct file *file, const char __user *a,
> 343 size_t size, loff_t *off)
> 344 {
> 345 int cpu;
> 346 struct hist_data *hist = NULL;
> 347 #if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
> 348 defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
> 349 struct maxlatproc_data *mp = NULL;
> 350 #endif
> 351 off_t latency_type = (off_t) file->private_data;
> 352
> 353 for_each_online_cpu(cpu) {
> 354
> 355 switch (latency_type) {
>
> It seems like this switch statement should have a default case.
>
> I haven't looked into it very closely but it seems like if you had all
> those config options turned off then "hist" would be still be NULL.
When all config options are turned off then the file is not compiled
at all.
Thanks,
tglx
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