linux-kernel - RE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool

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Date: Mon, 12 Feb 2024 18:58:36 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Yazen Ghannam <yazen.ghannam@....com>, Borislav Petkov <bp@...en8.de>,
	"Naik, Avadhut" <avadnaik@....com>
CC: "Mehta, Sohil" <sohil.mehta@...el.com>, "x86@...nel.org" <x86@...nel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Avadhut Naik
	<avadhut.naik@....com>
Subject: RE: [PATCH 2/2] x86/MCE: Add command line option to extend MCE
 Records pool

> I need to look more at the genpool code, but I thought I'd ask too.

Yazen,

gen_pool_add_owner() is the code that adds an extra chunk to an existing genpool.

This bit doesn't look obviously safe against a #MC at the wrong moment in the middle of
the list_add_rcu()

        spin_lock(&pool->lock);
        list_add_rcu(&chunk->next_chunk, &pool->chunks);
        spin_unlock(&pool->lock);

-Tony