linux-kernel - [PATCH v4 05/15] arm64: pgtable: use mmu gather to free p4d level page table

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Message-Id: <7c12112047ac230809aacd0379259414b9b0d3a3.1735549103.git.zhengqi.arch@bytedance.com>
Date: Mon, 30 Dec 2024 17:07:40 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
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	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v4 05/15] arm64: pgtable: use mmu gather to free p4d level page table

Like other levels of page tables, also use mmu gather mechanism to free
p4d level page table.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Originally-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: linux-arm-kernel@...ts.infradead.org
---
 arch/arm64/include/asm/pgalloc.h |  1 -
 arch/arm64/include/asm/tlb.h     | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h
index 2965f5a7e39e3..1b4509d3382c6 100644
--- a/arch/arm64/include/asm/pgalloc.h
+++ b/arch/arm64/include/asm/pgalloc.h
@@ -85,7 +85,6 @@ static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp)
 	__pgd_populate(pgdp, __pa(p4dp), pgdval);
 }
 
-#define __p4d_free_tlb(tlb, p4d, addr)  p4d_free((tlb)->mm, p4d)
 #else
 static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
 {
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
index a947c6e784ed2..445282cde9afb 100644
--- a/arch/arm64/include/asm/tlb.h
+++ b/arch/arm64/include/asm/tlb.h
@@ -111,4 +111,18 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
 }
 #endif
 
+#if CONFIG_PGTABLE_LEVELS > 4
+static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4dp,
+				  unsigned long addr)
+{
+	struct ptdesc *ptdesc = virt_to_ptdesc(p4dp);
+
+	if (!pgtable_l5_enabled())
+		return;
+
+	pagetable_p4d_dtor(ptdesc);
+	tlb_remove_ptdesc(tlb, ptdesc);
+}
+#endif
+
 #endif
-- 
2.20.1