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Date:   Sat, 6 Jun 2020 13:50:22 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Joerg Roedel <joro@8bytes.org>, x86@kernel.org, hpa@zytor.com,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, rjw@rjwysocki.net,
        Arnd Bergmann <arnd@arndb.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Michal Hocko <mhocko@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Joerg Roedel <jroedel@suse.de>, linux-kernel@vger.kernel.org,
        linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org,
        linux-mm@kvack.org, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v3 1/7] mm: Add functions to track page directory
 modifications
Message-ID: <20200606125021.GA12556@gaia>
References: <20200515140023.25469-1-joro@8bytes.org>
 <20200515140023.25469-2-joro@8bytes.org>
 <20200605100813.GA31371@gaia>
 <20200605114654.GD31371@gaia>
 <20200605180116.196116ea218df55f3252af57@linux-foundation.org>
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On Fri, Jun 05, 2020 at 06:01:16PM -0700, Andrew Morton wrote:
> On Fri, 5 Jun 2020 12:46:55 +0100 Catalin Marinas <catalin.marinas@arm.com> wrote:
> > On Fri, Jun 05, 2020 at 11:08:13AM +0100, Catalin Marinas wrote:
> > > This patch causes a kernel panic on arm64 (and possibly powerpc, I
> > > haven't tried). arm64 still uses the 5level-fixup.h and pud_alloc()
> > > checks for the empty p4d with pgd_none() instead of p4d_none().
> > 
> > Ah, should have checked the list first
> > (https://lore.kernel.org/linux-mm/20200604074446.23944-1-joro@8bytes.org/).
> 
> Can you confirm that the merge of Mike's 5level_hack zappage has fixed
> the arm64 wontboot?

Yes, it has. Mainline is booting again on arm64.

Thanks.

-- 
Catalin