linux-kernel - Re: [GIT PULL] EDAC updates for v6.9

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Date: Mon, 11 Mar 2024 18:12:54 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Borislav Petkov <bp@...en8.de>
Cc: x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>, 
	linux-edac <linux-edac@...r.kernel.org>
Subject: Re: [GIT PULL] EDAC updates for v6.9

On Mon, 11 Mar 2024 at 08:57, Borislav Petkov <bp@...en8.de> wrote:
>
> -       return topology_die_id(err->cpu) % amd_get_nodes_per_socket();
> +       return topology_amd_node_id(err->cpu) % topology_amd_nodes_per_pkg();

Ho humm. Lookie here:

    static inline unsigned int topology_amd_nodes_per_pkg(void)
    { return 0; };

that's the UP case.

Yeah, I'm assuming nobody tests this for UP, but it's clearly wrong to
potentially do that modulus by zero.

So I made the merge also change that UP case of
topology_amd_nodes_per_pkg() to return 1.

Because dammit, not only is a mod-by-zero wrong, a UP system most
definitely has one node per package, not zero.

               Linus