linux-kernel - RE: [PATCH v2 0/5] mm/hwpoison: Fix regressions in memory failure handling

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Message-ID: <SJ1PR11MB60830555A8B1621CA62D4FC3FCFA2@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Tue, 18 Feb 2025 17:59:16 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Shuai Xue <xueshuai@...ux.alibaba.com>, Borislav Petkov <bp@...en8.de>
CC: "nao.horiguchi@...il.com" <nao.horiguchi@...il.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "mingo@...hat.com" <mingo@...hat.com>,
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	<x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>, "linmiaohe@...wei.com"
	<linmiaohe@...wei.com>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>, "peterz@...radead.org" <peterz@...radead.org>,
	"jpoimboe@...nel.org" <jpoimboe@...nel.org>, "linux-edac@...r.kernel.org"
	<linux-edac@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	"baolin.wang@...ux.alibaba.com" <baolin.wang@...ux.alibaba.com>,
	"tianruidong@...ux.alibaba.com" <tianruidong@...ux.alibaba.com>
Subject: RE: [PATCH v2 0/5] mm/hwpoison: Fix regressions in memory failure
 handling

>> What do futexes have to do with copying user memory?
>
> Return -EFAULT to userspace.

Missed this bit. Kernel code for futex does a get_user() to read the
value of the futex from user memory.

-Tony