[Crash-utility] [PATCH] Change the way of determining the Xen scheduler

[Dave Anderson]

----- Original Message -----
> The command line options (such as opt_sched) are discarded after boot in Xen4,
> so they are no longer available. Use the "ops" variable (if exists) to
> determine the active scheduler. Without this patch, crash fails during
> initialization on Xen4 hypervisor dumps with 'crash: schedule data not
> found.'

Queued for the next release.

Thanks,
  Dave
 
> Signed-off-by: Petr Tesarik <ptesarik at suse.cz>
> ---
> xen_hyper.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
> 
> --- a/xen_hyper.c
> +++ b/xen_hyper.c
> @@ -445,13 +445,21 @@ xen_hyper_schedule_init(void)
> error(FATAL, "cannot malloc scheduler struct space.\n");
> }
> buf = GETBUF(XEN_HYPER_SCHEDULER_NAME);
> - opt_sched = symbol_value("opt_sched");
> + scheduler_opt_name = XEN_HYPER_OFFSET(scheduler_opt_name);
> + if (symbol_exists("ops")) {
> + if (!readmem(symbol_value("ops") + scheduler_opt_name, KVADDR,
> + &opt_sched, sizeof(ulong), "ops.opt_name",
> + RETURN_ON_ERROR)) {
> + error(FATAL, "cannot read ops.opt_name.\n");
> + }
> + } else {
> + opt_sched = symbol_value("opt_sched");
> + }
> if (!readmem(opt_sched, KVADDR, xhscht->opt_sched,
> XEN_HYPER_OPT_SCHED_SIZE, "opt_sched,", RETURN_ON_ERROR)) {
> error(FATAL, "cannot read opt_sched,.\n");
> }
> schedulers = symbol_value("schedulers");
> - scheduler_opt_name = XEN_HYPER_OFFSET(scheduler_opt_name);
> addr = schedulers;
> while (xhscht->name == NULL) {
> if (!readmem(addr, KVADDR, schedulers_buf,
> 
> --
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