Re: [PATCH v2 2/2] memblock: do not start bottom-up allocations with kernel_end

[Thiago Jung Bauermann]

Mike Rapoport <rppt@xxxxxxxxxx> writes:

> > Signed-off-by: Roman Gushchin <guro@xxxxxx>
> 
> Reviewed-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>

I've seen a couple of spurious triggers of the WARN_ONCE() removed by this
patch. This happens on some ppc64le bare metal (powernv) server machines with
CONFIG_SWIOTLB=y and crashkernel=4G, as described in a candidate patch I posted
to solve this issue in a different way:

https://lore.kernel.org/linuxppc-dev/20201218062103.76102-1-bauerman@xxxxxxxxxxxxx/

Since this patch solves that problem, is it possible to include it in the next
feasible v5.11-rcX, with the following tag?

Fixes: 8fabc623238e ("powerpc: Ensure that swiotlb buffer is allocated from low memory")

This is because reverting the commit above also solves the problem on the
machines where I've seen this issue.

-- 
Thiago Jung Bauermann
IBM Linux Technology Center