[Crash-utility] [PATCH] Fix for "timer -r -C" option to display all the per-CPU clocks

[Lianbo Jiang]

Currently, the hrtimer_max_clock_bases is hard-coded to 3, which
makes that crash only prints three clocks, and the rest of clocks
are not displayed.

Without the patch:
crash> timer -r -C 11
CPU: 11  HRTIMER_CPU_BASE: ffff9a775f95ee00
  CLOCK: 0  HRTIMER_CLOCK_BASE: ffff9a775f95ee80  [ktime_get]
  (empty)

  CLOCK: 1  HRTIMER_CLOCK_BASE: ffff9a775f95ef00  [ktime_get_real]
  (empty)

  CLOCK: 2  HRTIMER_CLOCK_BASE: ffff9a775f95ef80  [ktime_get_boottime]
  (empty)

With the patch:
crash> timer -r -C 11
CPU: 11  HRTIMER_CPU_BASE: ffff9a775f95ee00
  CLOCK: 0  HRTIMER_CLOCK_BASE: ffff9a775f95ee80  [ktime_get]
  (empty)

  CLOCK: 1  HRTIMER_CLOCK_BASE: ffff9a775f95ef00  [ktime_get_real]
  (empty)

  CLOCK: 2  HRTIMER_CLOCK_BASE: ffff9a775f95ef80  [ktime_get_boottime]
  (empty)
...
  CLOCK: 7  HRTIMER_CLOCK_BASE: ffff9a775f95f200  [ktime_get_clocktai]
  (empty)

Signed-off-by: Lianbo Jiang <lijiang at redhat.com>
---
 kernel.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel.c b/kernel.c
index 37b7af74ed2e..36c57ed501ad 100644
--- a/kernel.c
+++ b/kernel.c
@@ -7675,7 +7675,8 @@ dump_hrtimer_data(const ulong *cpus)
 	if (VALID_STRUCT(hrtimer_clock_base)) {
 		hrtimer_max_clock_bases = 2;
 		if (symbol_exists("ktime_get_boottime"))
-			hrtimer_max_clock_bases = 3;
+			hrtimer_max_clock_bases = MEMBER_SIZE("hrtimer_cpu_base", "clock_base") /
+							SIZE(hrtimer_clock_base);
 	} else if (VALID_STRUCT(hrtimer_base)) {
 		max_hrtimer_bases = 2;
 	} else
-- 
2.20.1