Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 14 Jul 2021 22:13:14 +0200
From:   Heiko Carstens <hca@linux.ibm.com>
To:     David Hildenbrand <david@redhat.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
        Wei Yang <richard.weiyang@linux.alibaba.com>,
        Oscar Salvador <osalvador@suse.de>,
        Michal Hocko <mhocko@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mike Rapoport <rppt@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Catalin Marinas <catalin.marinas@arm.com>,
        virtualization@lists.linux-foundation.org,
        linux-acpi@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
        Anton Blanchard <anton@ozlabs.org>,
        Ard Biesheuvel <ardb@kernel.org>, Baoquan He <bhe@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Borislav Petkov <bp@alien8.de>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Dave Jiang <dave.jiang@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Jia He <justin.he@arm.com>, Joe Perches <joe@perches.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        Michel Lespinasse <michel@lespinasse.org>,
        Nathan Lynch <nathanl@linux.ibm.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Pierre Morel <pmorel@linux.ibm.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Rich Felker <dalias@libc.org>,
        Scott Cheloha <cheloha@linux.ibm.com>,
        Sergei Trofimovich <slyfox@gentoo.org>,
        Thiago Jung Bauermann <bauerman@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Will Deacon <will@kernel.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: Re: [PATCH v1 1/4] mm/memory_hotplug: use "unsigned long" for PFN in
 zone_for_pfn_range()
Message-ID: <YO9FWrT9h21e/G8X@osiris>
References: <20210712124052.26491-1-david@redhat.com>
 <20210712124052.26491-2-david@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210712124052.26491-2-david@redhat.com>
Precedence: bulk

On Mon, Jul 12, 2021 at 02:40:49PM +0200, David Hildenbrand wrote:
> Checkpatch complained on a follow-up patch that we are using "unsigned"
> here, which defaults to "unsigned int" and checkpatch is correct.
> 
> Use "unsigned long" instead, just as we do in other places when handling
> PFNs. This can bite us once we have physical addresses in the range of
> multiple TB.
> 
> Fixes: e5e689302633 ("mm, memory_hotplug: display allowed zones in the preferred ordering")
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  include/linux/memory_hotplug.h | 4 ++--
>  mm/memory_hotplug.c            | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)

I'd propose to add Cc: <stable@vger.kernel.org> since I actually had
the fun to try to debug something like this a couple of years ago:
6cdb18ad98a4 ("mm/vmstat: fix overflow in mod_zone_page_state()")