linux-kernel - [PATCH v3 03/13] powerpc/mm: implement arch_flush_lazy_mmu

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Message-ID: <20251015082727.2395128-4-kevin.brodsky@arm.com>
Date: Wed, 15 Oct 2025 09:27:17 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	Kevin Brodsky <kevin.brodsky@....com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andreas Larsson <andreas@...sler.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	"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>,
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	Suren Baghdasaryan <surenb@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	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: [PATCH v3 03/13] powerpc/mm: implement arch_flush_lazy_mmu_mode()

Upcoming changes to the lazy_mmu API will cause
arch_flush_lazy_mmu_mode() to be called when leaving a nested
lazy_mmu section.

Move the relevant logic from arch_leave_lazy_mmu_mode() to
arch_flush_lazy_mmu_mode() and have the former call the latter.

Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
---
 .../powerpc/include/asm/book3s/64/tlbflush-hash.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
index 146287d9580f..7704dbe8e88d 100644
--- a/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush-hash.h
@@ -41,6 +41,16 @@ static inline void arch_enter_lazy_mmu_mode(void)
 	batch->active = 1;
 }
 
+static inline void arch_flush_lazy_mmu_mode(void)
+{
+	struct ppc64_tlb_batch *batch;
+
+	batch = this_cpu_ptr(&ppc64_tlb_batch);
+
+	if (batch->index)
+		__flush_tlb_pending(batch);
+}
+
 static inline void arch_leave_lazy_mmu_mode(void)
 {
 	struct ppc64_tlb_batch *batch;
@@ -49,14 +59,11 @@ static inline void arch_leave_lazy_mmu_mode(void)
 		return;
 	batch = this_cpu_ptr(&ppc64_tlb_batch);
 
-	if (batch->index)
-		__flush_tlb_pending(batch);
+	arch_flush_lazy_mmu_mode();
 	batch->active = 0;
 	preempt_enable();
 }
 
-#define arch_flush_lazy_mmu_mode()      do {} while (0)
-
 extern void hash__tlbiel_all(unsigned int action);
 
 extern void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize,
-- 
2.47.0