[xen stable-4.13] xen/trace: Don't dump offline CPUs in debugtrace_dump_worker()

[patchbot@xxxxxxx]

commit 672976cfbb2673065b4e8bb380189a9332c98cbc
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jun 24 16:31:09 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jun 24 16:31:09 2020 +0200

    xen/trace: Don't dump offline CPUs in debugtrace_dump_worker()
    
    The 'T' debugkey reliably wedges on one of my systems, which has a sparse
    APIC_ID layout due to a non power-of-2 number of cores per socket.  The
    per_cpu(dt_cpu_data, cpu) calcution falls over the deliberately 
non-canonical
    poison value.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: abf378e6483195b98a3f32e2c9d017e0eeeb275f
    master date: 2020-05-22 20:04:46 +0100
---
 xen/common/debugtrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/debugtrace.c b/xen/common/debugtrace.c
index a788e55b4c..11ac198d93 100644
--- a/xen/common/debugtrace.c
+++ b/xen/common/debugtrace.c
@@ -94,7 +94,7 @@ static void debugtrace_dump_worker(void)
 
     debugtrace_dump_buffer(dt_data, "global");
 
-    for ( cpu = 0; cpu < nr_cpu_ids; cpu++ )
+    for_each_online_cpu ( cpu )
     {
         char buf[16];
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.13