diff options
| author | Nathan Zimmer <nzimmer@sgi.com> | 2013-02-20 13:13:46 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2013-02-26 13:41:23 +1100 |
| commit | bd8c25b6c6ede0fc5190c6c835e52966886a1785 (patch) | |
| tree | 482b23b97ec4a9434ae3b0d3439575956161cf49 /kernel/time/timer_list.c | |
| parent | 9caca24823da2c5a4fc1166c57c8f9618f1bff7c (diff) | |
timer_list-convert-timer-list-to-be-a-proper-seq_file-v2
v2: Added comments on the iteration.
Signed-off-by: Nathan Zimmer <nzimmer@sgi.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/time/timer_list.c')
| -rw-r--r-- | kernel/time/timer_list.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c index c438d759228d..1098ee4d23c8 100644 --- a/kernel/time/timer_list.c +++ b/kernel/time/timer_list.c @@ -274,6 +274,19 @@ static int timer_list_show(struct seq_file *m, void *v) return 0; } +/* + * This itererator really needs some explination since it is offset and has + * two passes one of which is controlled by a config option. + * In a hotplugged system some cpus, including cpu 0, may be missing so we have + * to use cpumask_* to iterate over the cpus. + * For the first pass: + * It returns 1 for the header position. + * For cpu 0 it returns 2 and the final possible cpu would be nr_cpu_ids + 1. + * On the second pass: + * It returnes nr_cpu_ids + 1 for the second header position. + * For cpu 0 it returns nr_cpu_ids + 2 + * The final possible cpu would be nr_cpu_ids + nr_cpu_ids + 2. + */ static void *timer_list_start(struct seq_file *file, loff_t *offset) { unsigned long n = *offset; |