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 21:18:40 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Naik, Avadhut" <avadnaik@....com>
Cc: "Luck, Tony" <tony.luck@...el.com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	"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

On Mon, Feb 12, 2024 at 01:40:21PM -0600, Naik, Avadhut wrote:
> The spinlock is mostly held to prevent other primitives
> from modifying chunks within the genpool.
> 
> In #MC context however, we are not modifying the existing
> chunks, per se.

What if we decide to do

	mce[i]count++;

in #MC context?

That's modifying the existing chunks.

TBH, I'm not sure what that spinlock is for. See my reply to that same
subthread.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette