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Date:   Thu, 24 Dec 2020 13:57:59 -0800
From:   Linus Torvalds <>
To:     Thomas Gleixner <>,
        Eran Ben Elisha <>,
        Saeed Mahameed <>
Cc:     Linux Kernel Mailing List <>,
        "the arch/x86 maintainers" <>,
        linux-rdma <>
Subject: Re: [GIT pull] irq/core for v5.11-rc1

On Tue, Dec 22, 2020 at 3:58 PM Thomas Gleixner <> wrote:
>   A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy
>   accesses, inefficient and disfunctional code. The goal is to remove the
>   export of irq_to_desc() to prevent these things from creeping up again.

This exposed that the mellanox mlx5 driver had grown another use of
'irq_desc' in commit 145e5637d941 ("net/mlx5e: Add TX PTP port object

Except that use was write-only, with the only acces being this assignment:

        c->irq_desc = irq_to_desc(irq);

so I removed the 'irq_desc' field and that assignment in my merge.

I didn't even replace it with an affinity mask thing like commit
6e745db4ddd0 ("net/mlx5: Replace irq_to_desc() abuse") did for the
previous case, because the irq_desc thing was literally pointless and
unused. I suspect it was some cut-and-paste programming.

Just writing this note so that everybody knows what's going on.


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