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

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Date:   Sat, 23 Jan 2021 18:09:11 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     rppt@...nel.org, guro@...com, iamjoonsoo.kim@....com,
        Ram Pai <linuxram@...ibm.com>,
        Konrad Rzeszutek Wilk <konrad@...nok.org>,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        kernel-team@...com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        mhocko@...nel.org, riel@...riel.com
Subject: Re: [PATCH v2 2/2] memblock: do not start bottom-up allocations
 with kernel_end

On Fri, 22 Jan 2021 01:37:14 -0300 Thiago Jung Bauermann <bauerman@...ux.ibm.com> wrote:

> Mike Rapoport <rppt@...nel.org> writes:
> 
> > > Signed-off-by: Roman Gushchin <guro@...com>
> > 
> > Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>
> 
> 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@linux.ibm.com/
> 
> Since this patch solves that problem, is it possible to include it in the next
> feasible v5.11-rcX, with the following tag?

We could do this, if we're confident that this patch doesn't depend on
[1/2] "mm: cma: allocate cma areas bottom-up"?  I think it is...

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

I added that.