linux-kernel - Re: [PATCH] x86/mm: Fix leak of pmd ptlock

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Date:   Thu, 3 Dec 2020 11:54:07 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        stable@...r.kernel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Yi Zhang <yi.zhang@...hat.com>,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        willy@...radead.org
Subject: Re: [PATCH] x86/mm: Fix leak of pmd ptlock

On Wed, Dec 02, 2020 at 10:28:12PM -0800, Dan Williams wrote:
> pmd_free() is close, but it is a messy fit due to requiring an @mm arg.

Hurpm, only parisc and s390 actually use that argument. And s390
_really_ needs it, because they're doing runtime folding per mm.