linux-kernel - [PATCH 2/2] x86/topology: use bitmap_weight

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Message-ID: <20251214235437.244125-3-yury.norov@gmail.com>
Date: Sun, 14 Dec 2025 18:54:36 -0500
From: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Yury Norov <yury.norov@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>,
	"Xin Li (Intel)" <xin@...or.com>,
	"Chang S. Bae" <chang.seok.bae@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86/topology: use bitmap_weight_from()

Switch topo_unit_count() to use bitmap_weight_from().

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>
---
 arch/x86/kernel/cpu/topology.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c
index f55ea3cdbf88..ba7142f417ad 100644
--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -204,15 +204,11 @@ static __init bool check_for_real_bsp(u32 apic_id)
 static unsigned int topo_unit_count(u32 lvlid, enum x86_topology_domains at_level,
 				    unsigned long *map)
 {
-	unsigned int id, end, cnt = 0;
+	unsigned int end;
 
 	/* Calculate the exclusive end */
 	end = lvlid + (1U << x86_topo_system.dom_shifts[at_level]);
-
-	/* Unfortunately there is no bitmap_weight_range() */
-	for (id = find_next_bit(map, end, lvlid); id < end; id = find_next_bit(map, end, ++id))
-		cnt++;
-	return cnt;
+	return bitmap_weight_from(map, lvlid, end);
 }
 
 static __init void topo_register_apic(u32 apic_id, u32 acpi_id, bool present)
-- 
2.43.0