linux-kernel - [PATCH v2 08/18] riscv: mm: Simplify set_p4d() and set

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Message-ID: <20251009015839.3460231-9-samuel.holland@sifive.com>
Date: Wed,  8 Oct 2025 18:57:44 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <pjw@...nel.org>,
	linux-riscv@...ts.infradead.org
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Conor Dooley <conor@...nel.org>,
	Alexandre Ghiti <alex@...ti.fr>,
	Emil Renner Berthing <kernel@...il.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH v2 08/18] riscv: mm: Simplify set_p4d() and set_pgd()

RISC-V uses the same page table entry format and has the same atomicity
requirements at all page table levels, so these setter functions use the
same underlying implementation at all levels. Checking the translation
mode to pick between two identical branches only serves to make these
functions less efficient.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

Changes in v2:
 - New patch for v2

 arch/riscv/include/asm/pgtable-64.h | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 1018d22169013..7eb23c24310f9 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -273,10 +273,7 @@ static inline unsigned long _pmd_pfn(pmd_t pmd)
 
 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
 {
-	if (pgtable_l4_enabled)
-		WRITE_ONCE(*p4dp, p4d);
-	else
-		set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
+	WRITE_ONCE(*p4dp, p4d);
 }
 
 static inline int p4d_none(p4d_t p4d)
@@ -340,10 +337,7 @@ pud_t *pud_offset(p4d_t *p4d, unsigned long address);
 
 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 {
-	if (pgtable_l5_enabled)
-		WRITE_ONCE(*pgdp, pgd);
-	else
-		set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
+	WRITE_ONCE(*pgdp, pgd);
 }
 
 static inline int pgd_none(pgd_t pgd)
-- 
2.47.2