[PATCH] powerpc/powernv/memtrace: Fake non-memblock aligned sized traces

[Michael Ellerman]

Jordan Niethe <jniethe5 at gmail.com> writes:
> The hardware trace macros which use the memory provided by memtrace are
> able to use trace sizes as small as 16MB. Only memblock aligned values
> can be removed from each NUMA node by writing that value to
> memtrace/enable in debugfs.  This means setting up, say, a 16MB trace is
> not possible.  To allow such a trace size, instead align whatever value
> is written to memtrace/enable to the memblock size for the purpose of
> removing it from each NUMA node but report the written value from
> memtrace/enable and memtrace/x/size in debugfs.

Why does it matter if the size that's removed is larger than the size
that was requested?

Is it about constraining the size of the trace? If so that seems like it
should be the job of the tracing tools, not the kernel.

cheers