linux-kernel - Re: [PATCH v6 05/13] mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180717064736.GA27953@hori1.linux.bs1.fc.nec.co.jp>
Date:   Tue, 17 Jul 2018 06:47:37 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "hch@....de" <hch@....de>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 05/13] mm, madvise_inject_error: Disable
 MADV_SOFT_OFFLINE for ZONE_DEVICE pages

On Fri, Jul 13, 2018 at 09:49:56PM -0700, Dan Williams wrote:
> Given that dax / device-mapped pages are never subject to page
> allocations remove them from consideration by the soft-offline
> mechanism.
> 
> Reported-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  mm/memory-failure.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 9d142b9b86dc..988f977db3d2 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1751,6 +1751,14 @@ int soft_offline_page(struct page *page, int flags)
>  	int ret;
>  	unsigned long pfn = page_to_pfn(page);
>  
> +	if (is_zone_device_page(page)) {
> +		pr_debug_ratelimited("soft_offline: %#lx page is device page\n",
> +				pfn);
> +		if (flags & MF_COUNT_INCREASED)
> +			put_page(page);

put_hwpoison_page(), which is just an alias of put_page(), is better
for consistency.
With this adjustment, feel free to add my ack.

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Thanks,
Naoya Horiguchi

> +		return -EIO;
> +	}
> +
>  	if (PageHWPoison(page)) {
>  		pr_info("soft offline: %#lx page already poisoned\n", pfn);
>  		if (flags & MF_COUNT_INCREASED)
> 
>