linux-kernel - Re: [PATCH RFC v1] drivers/base/node: consolidate node device subsystem initialization in node_dev

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Date:   Tue, 1 Feb 2022 11:17:01 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH RFC v1] drivers/base/node: consolidate node device
 subsystem initialization in node_dev_init()

On 31.01.22 10:40, Oscar Salvador wrote:
> On Mon, Jan 31, 2022 at 08:48:54AM +0100, David Hildenbrand wrote:
>> Hi Oscar,
> 
> Hi David :-),
> 
>> Right, and the idea is that the online state of nodes (+ node/zone
>> ranges) already has to be known at that point in time, because
>> otherwise, we'd be in bigger trouble.
> 
> Yeah, I wanted to check where exactly did we mark the nodes online,
> and for the few architectures I checked it happens in setup_arch(),
> which is called very early in start_kernel(), while driver_init()
> gets called through arch_call_rest_init(), which happens at the end
> of the function.
> 
> I am not sure whether we want to remark that somehow in the changelog,
> so it is crystal clear that by the time the node_dev_init() gets called,
> we already set the nodes online.
> 
> Anyway, just saying, but is fine as is.

I'll adjust the first paragraph to:

    ... and call node_dev_init() after memory_dev_init() from driver_init(),
    so before any of the existing arch/subsys calls. All online nodes should
    be known at that point: early during boot, arch code determines node and
    zone ranges and sets the relevant nodes online; usually this happens in
    setup_arch().

Thanks!

-- 
Thanks,

David / dhildenb