linux-kernel - Re: [PATCH v2 02/12] x86: pgtable: Always use pte_free

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Message-ID: <2560f4a7-d108-497d-b85f-b195d43c67ad@intel.com>
Date: Tue, 8 Apr 2025 10:42:16 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Kevin Brodsky <kevin.brodsky@....com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Albert Ou <aou@...s.berkeley.edu>,
 Andreas Larsson <andreas@...sler.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Catalin Marinas <catalin.marinas@....com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>,
 Geert Uytterhoeven <geert@...ux-m68k.org>,
 Linus Walleij <linus.walleij@...aro.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Mark Rutland <mark.rutland@....com>, Michael Ellerman <mpe@...erman.id.au>,
 "Mike Rapoport (IBM)" <rppt@...nel.org>, Palmer Dabbelt
 <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>,
 Peter Zijlstra <peterz@...radead.org>, Qi Zheng
 <zhengqi.arch@...edance.com>, Ryan Roberts <ryan.roberts@....com>,
 Will Deacon <will@...nel.org>, Yang Shi <yang@...amperecomputing.com>,
 linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-csky@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
 linux-openrisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-s390@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 02/12] x86: pgtable: Always use pte_free_kernel()

On 4/8/25 10:40, Matthew Wilcox wrote:
> I think at this point in Kevin's series, we don't call the ctor for
> these pages, so we never set PageTable() on them.  I could be wrong;
> as Kevin says, this is all very twisty and confusing with exceptions and
> exceptions to exceptions.  This series should reduce the confusion.

Oh, for sure. I didn't mean to detract from the series as a whole. It
totally looks like a good idea!