linux-kernel - Re: [PATCH v11 10/11] mm/hugetlb: Gather discrete indexes of tail page

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Date:   Tue, 22 Dec 2020 17:29:52 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        paulmck@...nel.org, mchehab+huawei@...nel.org,
        pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org,
        oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
        almasrymina@...gle.com, rientjes@...gle.com, willy@...radead.org,
        mhocko@...e.com, song.bao.hua@...ilicon.com, david@...hat.com,
        naoya.horiguchi@....com, duanxiongchun@...edance.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v11 10/11] mm/hugetlb: Gather discrete indexes of tail
 page

On Tue, Dec 22, 2020 at 10:24:39PM +0800, Muchun Song wrote:
> +#else
> +static inline void hwpoison_subpage_deliver(struct hstate *h, struct page *head)
> +{
> +}
> +
> +static inline void hwpoison_subpage_set(struct hstate *h, struct page *head,
> +					struct page *page)
> +{
> +	if (PageHWPoison(head) && page != head) {
> +		/*
> +		 * Move PageHWPoison flag from head page to the raw error page,
> +		 * which makes any subpages rather than the error page reusable.
> +		 */
> +		SetPageHWPoison(page);
> +		ClearPageHWPoison(head);
> +	}
> +}
> +#endif

Sorry, I guess I should have made a more clear statement.
This patch should really be about changing the numeric index to its symbolic
names, so the #ifdef handling of hwpoison_subpage_* should have been gone into
patch#6.

I will have a closer look later on though.

-- 
Oscar Salvador
SUSE L3