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

[patchbot@xxxxxxx]

commit abf378e6483195b98a3f32e2c9d017e0eeeb275f
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu May 21 09:19:33 2020 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri May 22 20:04:46 2020 +0100

    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>
---
 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 c21ec99ee0..f3794b9453 100644
--- a/xen/common/debugtrace.c
+++ b/xen/common/debugtrace.c
@@ -95,7 +95,7 @@ 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];
 
--
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