linux-kernel - [PATCH 0/2] x86/topology: add bitmap_weight_from() and use it in topo_unit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251214235437.244125-1-yury.norov@gmail.com>
Date: Sun, 14 Dec 2025 18:54:34 -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 0/2] x86/topology: add bitmap_weight_from() and use it in topo_unit_count()

Currently the function open-codes the missing bitmap_weight_from() with
a for-loop, which is known to be less effective. Add the helper and
switch topo_unit_count() to using it.

Yury Norov (NVIDIA) (2):
  bitmap: add bitmap_weight_from()
  topology: use bitmap_weight_from()

 arch/x86/kernel/cpu/topology.c |  8 ++------
 include/linux/bitmap.h         | 25 +++++++++++++++++++++++++
 lib/bitmap.c                   | 28 ++++++++++++++++++++++++++++
 lib/test_bitmap.c              | 29 +++++++++++++++++++++++++++++
 4 files changed, 84 insertions(+), 6 deletions(-)

-- 
2.43.0