From: "Luck, Tony" <tony.luck@intel.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Borislav Petkov <bp@suse.de>, Dave Hansen <dave.hansen@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages
Date: Wed, 21 Jun 2017 10:54:03 -0700 [thread overview]
Message-ID: <20170621175403.n5kssz32e2oizl7k@intel.com> (raw)
In-Reply-To: <20170621021226.GA18024@hori1.linux.bs1.fc.nec.co.jp>
On Wed, Jun 21, 2017 at 02:12:27AM +0000, Naoya Horiguchi wrote:
> We had better have a reverse operation of this to cancel the unmapping
> when unpoisoning?
When we have unpoisoning, we can add something. We don't seem to have
an inverse function for "set_memory_np" to just flip the _PRESENT bit
back on again. But it would be trivial to write a set_memory_pp().
Since we'd be doing this after the poison has been cleared, we wouldn't
need to play games with the address. We'd just use:
set_memory_pp((unsigned long)pfn_to_kaddr(pfn), 1);
-Tony
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next prev parent reply other threads:[~2017-06-21 17:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 19:02 Luck, Tony
2017-06-19 18:01 ` Borislav Petkov
2017-06-21 17:47 ` Luck, Tony
2017-06-21 19:59 ` Elliott, Robert (Persistent Memory)
2017-06-21 20:19 ` Luck, Tony
2017-06-22 9:39 ` Borislav Petkov
2017-06-29 22:11 ` git send-email (w/o Cc: stable) Luck, Tony
2017-06-30 7:08 ` Borislav Petkov
2017-06-23 22:19 ` [PATCH] mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages Elliott, Robert (Persistent Memory)
2017-06-27 22:04 ` Luck, Tony
2017-06-27 22:09 ` Dan Williams
2017-08-16 17:18 ` [PATCH-resend] " Luck, Tony
2017-08-17 22:09 ` Andrew Morton
2017-08-17 22:29 ` Elliott, Robert (Persistent Memory)
2017-08-17 23:32 ` Luck, Tony
2017-06-21 2:12 ` [PATCH] " Naoya Horiguchi
2017-06-21 17:54 ` Luck, Tony [this message]
2017-06-21 19:47 ` Elliott, Robert (Persistent Memory)
2017-06-21 20:30 ` Luck, Tony
2017-06-23 5:07 ` Dan Williams
2017-06-23 20:59 ` Luck, Tony
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