linux-kernel - Re: [PATCH v6 14/14] mm: Add basic tests for lazy

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Message-Id: <20251216201403.4647a4f9861d3122ee9e90d7@linux-foundation.org>
Date: Tue, 16 Dec 2025 20:14:03 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Kevin Brodsky <kevin.brodsky@....com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Andreas Larsson <andreas@...sler.com>, Anshuman
 Khandual <anshuman.khandual@....com>, Boris Ostrovsky
 <boris.ostrovsky@...cle.com>, Borislav Petkov <bp@...en8.de>, Catalin
 Marinas <catalin.marinas@....com>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Dave Hansen <dave.hansen@...ux.intel.com>,
 David Hildenbrand <david@...hat.com>, "David S. Miller"
 <davem@...emloft.net>, David Woodhouse <dwmw2@...radead.org>,
 "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Jann Horn
 <jannh@...gle.com>, Juergen Gross <jgross@...e.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael Ellerman
 <mpe@...erman.id.au>, Michal Hocko <mhocko@...e.com>, Mike Rapoport
 <rppt@...nel.org>, Nicholas Piggin <npiggin@...il.com>, Peter Zijlstra
 <peterz@...radead.org>, "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
 Ryan Roberts <ryan.roberts@....com>, Suren Baghdasaryan
 <surenb@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Venkat Rao
 Bagalkote <venkat88@...ux.ibm.com>, Vlastimil Babka <vbabka@...e.cz>, Will
 Deacon <will@...nel.org>, Yeoreum Yun <yeoreum.yun@....com>,
 linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
 sparclinux@...r.kernel.org, xen-devel@...ts.xenproject.org, x86@...nel.org
Subject: Re: [PATCH v6 14/14] mm: Add basic tests for lazy_mmu

On Mon, 15 Dec 2025 15:03:23 +0000 Kevin Brodsky <kevin.brodsky@....com> wrote:

> Add basic KUnit tests for the generic aspects of the lazy MMU mode:
> ensure that it appears active when it should, depending on how
> enable/disable and pause/resume pairs are nested.

I needed this for powerpc allmodconfig;

--- a/arch/powerpc/mm/book3s64/hash_tlb.c~mm-add-basic-tests-for-lazy_mmu-fix
+++ a/arch/powerpc/mm/book3s64/hash_tlb.c
@@ -30,6 +30,7 @@
 #include <trace/events/thp.h>

 DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
+EXPORT_SYMBOL_GPL(ppc64_tlb_batch);

 /*
  * A linux PTE was changed and the corresponding hash table entry
@@ -154,6 +155,7 @@ void __flush_tlb_pending(struct ppc64_tl
 		flush_hash_range(i, local);
 	batch->index = 0;
 }
+EXPORT_SYMBOL_GPL(__flush_tlb_pending);

 void hash__tlb_flush(struct mmu_gather *tlb)
 {
_