Hi Dave, On Mon, 2010-04-26 at 11:56 -0400, Dave Anderson wrote: > Sorry -- I take it back. Running a test shows that it breaks "bt -a" > on Xen dumpfiles where the cpus are marked offline prior to dumping > the kernel memory. > > I think this should be moved to the processor-specific backtrace functions, > which can just display "OFFLINE" or something to that effect. Ok, fine. What about the following...

--- s390.c | 5 +++++ s390x.c | 5 +++++ 2 files changed, 10 insertions(+) --- a/s390.c +++ b/s390.c @@ -603,11 +603,16 @@ s390_back_trace_cmd(struct bt_info *bt) unsigned long async_start = 0, async_end = 0; unsigned long panic_start = 0, panic_end = 0; unsigned long stack_end, stack_start, stack_base; + int cpu = bt->tc->processor; if (bt->hp && bt->hp->eip) { error(WARNING, "instruction pointer argument ignored on this architecture!\n"); } + if (is_task_active(bt->task) && (!(kt->cpu_flags[cpu] & ONLINE))) { + fprintf(fp, " CPU offline\n"); + return; + } ksp = bt->stkptr; /* print lowcore and get async stack when task has cpu */ --- a/s390x.c +++ b/s390x.c @@ -836,11 +836,16 @@ s390x_back_trace_cmd(struct bt_info *bt) unsigned long panic_start = 0, panic_end = 0; unsigned long stack_end, stack_start, stack_base; unsigned long r14; + int cpu = bt->tc->processor; if (bt->hp && bt->hp->eip) { error(WARNING, "instruction pointer argument ignored on this architecture!\n"); } + if (is_task_active(bt->task) && (!(kt->cpu_flags[cpu] & ONLINE))) { + fprintf(fp, " CPU offline\n"); + return; + } ksp = bt->stkptr; /* print lowcore and get async stack when task has cpu */