linux-kernel - [PATCH] arm64/mm: Assert NR_BM_PUD_TABLES for bm

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Message-Id: <20260107061606.3160088-1-anshuman.khandual@arm.com>
Date: Wed,  7 Jan 2026 06:16:06 +0000
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: mark.rutland@....com,
	ryan.roberts@....com,
	Anshuman Khandual <anshuman.khandual@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/mm: Assert NR_BM_PUD_TABLES for bm_pud[]

There is an implicit assumption about bm_pud[] being single entry PUD table
just like bp_pmd[] which is a single entry PMD table. Though only the later
gets asserted via NR_BM_PMD_TABLES. Hence let's add a similar check for PUD
table as well.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/mm/fixmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/mm/fixmap.c b/arch/arm64/mm/fixmap.c
index c5c5425791da..e02594be8b8e 100644
--- a/arch/arm64/mm/fixmap.c
+++ b/arch/arm64/mm/fixmap.c
@@ -23,8 +23,11 @@ static_assert(FIXADDR_TOT_START > PCI_IO_END);
 	SPAN_NR_ENTRIES(FIXADDR_TOT_START, FIXADDR_TOP, PMD_SHIFT)
 #define NR_BM_PMD_TABLES \
 	SPAN_NR_ENTRIES(FIXADDR_TOT_START, FIXADDR_TOP, PUD_SHIFT)
+#define NR_BM_PUD_TABLES \
+	SPAN_NR_ENTRIES(FIXADDR_TOT_START, FIXADDR_TOP, P4D_SHIFT)
 
 static_assert(NR_BM_PMD_TABLES == 1);
+static_assert(NR_BM_PUD_TABLES == 1);
 
 #define __BM_TABLE_IDX(addr, shift) \
 	(((addr) >> (shift)) - (FIXADDR_TOT_START >> (shift)))
-- 
2.30.2