linux-kernel - [PATCH] riscv: mm: Define MAX_POSSIBLE_PHYSMEM

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Message-ID: <20251015233327.3885003-1-samuel.holland@sifive.com>
Date: Wed, 15 Oct 2025 16:33:24 -0700
From: Samuel Holland <samuel.holland@...ive.com>
To: Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Alistair Popple <apopple@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH] riscv: mm: Define MAX_POSSIBLE_PHYSMEM_BITS for zsmalloc

This definition is used by zsmalloc to optimize memory allocation. On
riscv64, it is the same as MAX_PHYSMEM_BITS from asm/sparsemem.h, but
that definition depends on CONFIG_SPARSEMEM. The correct definition is
already provided for riscv32.

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

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

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 1018d2216901..6e789fa58514 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -69,6 +69,8 @@ typedef struct {
 
 #define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
 
+#define MAX_POSSIBLE_PHYSMEM_BITS 56
+
 /*
  * rv64 PTE format:
  * | 63 | 62 61 | 60 54 | 53  10 | 9             8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
-- 
2.47.2

base-commit: 5a6f65d1502551f84c158789e5d89299c78907c7
branch: up/max-physmem-bits