irq -a will dump cpu affinity for irqs. This patch will hide offline
cpus.
The original output is like below:
<cut>
crash> irq -a
IRQ NAME AFFINITY
0 timer 0-3
1 i8042 0
6 floppy 0-3
8 rtc0 0-3
...
<cut>
With data of offline cpu(cpu #2) hiden, the output is like below:
<cut>
crash> irq -a
IRQ NAME AFFINITY
0 timer 0-1,3
1 i8042 0
6 floppy 0-1,3
8 rtc0 0-1,3
...
<cut>
Signed-off-by: Qiao Nuohan <qiaonuohan@xxxxxxxxxxxxxx>
---
kernel.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/kernel.c b/kernel.c
index 758edcf..8063d61 100755
--- a/kernel.c
+++ b/kernel.c
@@ -5733,14 +5733,19 @@ get_irq_desc_addr(int irq)
static void
display_cpu_affinity(ulong *mask)
{
- int cpu, seq, start, count;
+ int cpu, seq, start, count, cpu_exist;
seq = FALSE;
start = 0;
count = 0;
for (cpu = 0; cpu < kt->cpus; ++cpu) {
- if (NUM_IN_BITMAP(mask, cpu)) {
+ /*
+ * on X86_64, offline cpu should not be displayed.
+ */
+ cpu_exist = !hide_offline_cpu(cpu) && NUM_IN_BITMAP(mask, cpu);
+
+ if (cpu_exist) {
if (seq)
continue;
start = cpu;
@@ -5757,6 +5762,9 @@ display_cpu_affinity(ulong *mask)
}
}
+ /*
+ * when seq is TRUE, the following cpus cannot be offline.
+ */
if (seq) {
if (count)
fprintf(fp, ",");
--
1.8.5.3
--
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