linux-kernel - Re: [PATCH v6 4/4] mm/hwpoison: introduce per-memory

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Message-ID: <20221017114311.GA3679212@hori.linux.bs1.fc.nec.co.jp>
Date:   Mon, 17 Oct 2022 11:43:11 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Yang Shi <shy828301@...il.com>,
        Oscar Salvador <osalvador@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        Jane Chu <jane.chu@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 4/4] mm/hwpoison: introduce per-memory_block hwpoison
 counter

On Sat, Oct 15, 2022 at 10:28:00AM +0800, Miaohe Lin wrote:
> On 2022/10/7 9:07, Naoya Horiguchi wrote:
...
> > diff --git a/include/linux/memory.h b/include/linux/memory.h
> > index aa619464a1df..ad8cd9bb3239 100644
> > --- a/include/linux/memory.h
> > +++ b/include/linux/memory.h
> > @@ -85,6 +85,9 @@ struct memory_block {
> >  	unsigned long nr_vmemmap_pages;
> >  	struct memory_group *group;	/* group (if any) for this block */
> >  	struct list_head group_next;	/* next block inside memory group */
> > +#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG)
> > +	atomic_long_t nr_hwpoison;
> > +#endif
> >  };
> >  
> >  int arch_get_memory_phys_device(unsigned long start_pfn);
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 17119dbf8fad..f80269e90772 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -3280,6 +3280,7 @@ extern int soft_offline_page(unsigned long pfn, int flags);
> >  extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags,
> >  					bool *migratable_cleared);
> >  extern void num_poisoned_pages_inc(unsigned long pfn);
> > +extern void num_poisoned_pages_sub(unsigned long pfn, long i);
> 
> The prototype of this function is: *inline* void num_poisoned_pages_sub(unsigned long pfn, long i).
> The combination of inline and extern looks weird to me. Is this a common use case?

No, it seems not.  I can find a few place of such a comination like task_curr()
and raise_softirq_irqoff(), but as long as I understand, there's little meaning
(showing explicitly but redundant) to add extern keyword to functions in shared
header files. So I think of dropping the extern keyword.

> 
> Anyway, this patch looks good to me. Thanks.
> Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>

Thank you.

- Naoya Horiguchi