[PATCH v5 2/4] nmi_backtrace: do a local dump_stack() instead of a self-NMI
atomlin at redhat.com
Thu Apr 14 08:19:33 PDT 2016
On Tue 2016-04-05 13:26 -0400, Chris Metcalf wrote:
> Currently on arm there is code that checks whether it should call
> dump_stack() explicitly, to avoid trying to raise an NMI when the
> current context is not preemptible by the backtrace IPI. Similarly,
> the forthcoming arch/tile support uses an IPI mechanism that does
> not support generating an NMI to self.
> Accordingly, move the code that guards this case into the generic
> mechanism, and invoke it unconditionally whenever we want a
> backtrace of the current cpu. It seems plausible that in all cases,
> dump_stack() will generate better information than generating a
> stack from the NMI handler. The register state will be missing,
> but that state is likely not particularly helpful in any case.
> Or, if we think it is helpful, we should be capturing and emitting
> the current register state in all cases when regs == NULL is passed
> to nmi_cpu_backtrace().
> Signed-off-by: Chris Metcalf <cmetcalf at mellanox.com>
> arch/arm/kernel/smp.c | 9 ---------
> lib/nmi_backtrace.c | 9 +++++++++
> 2 files changed, 9 insertions(+), 9 deletions(-)
Acked-by: Aaron Tomlin <atomlin at redhat.com>
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