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
| ||
|
Date: Mon, 5 Sep 2022 16:08:15 -0700 From: Yury Norov <yury.norov@...il.com> To: linux-kernel@...r.kernel.org Cc: Yury Norov <yury.norov@...il.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Andrew Morton <akpm@...ux-foundation.org>, Stephen Rothwell <sfr@...b.auug.org.au>, Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, "Paul E . McKenney" <paulmck@...nel.org>, Vlastimil Babka <vbabka@...e.cz>, Dmitry Vyukov <dvyukov@...gle.com>, Valentin Schneider <vschneid@...hat.com>, Sander Vanheule <sander@...nheule.net>, Alexey Klimov <klimov.linux@...il.com>, Eric Biggers <ebiggers@...gle.com> Subject: [PATCH v2 0/5] cpumask: cleanup nr_cpu_ids vs nr_cpumask_bits mess cpumask subsystem uses nr_cpu_ids and nr_cpumask_bits interchangeably despite that the variables have different meaning and purpose. It makes some cpumask functions broken. This series cleans that mess and adds new config FORCE_NR_CPUS that allows to optimize cpumask subsystem if the number of CPUs is known at compile-time. After some testing I found build broken when SMP is on and NR_CPUS == 1. This is addressed in a new patch #1, and in the following patch #2 that now declares set_nr_cpu_ids in cpumask.h (was in smp.h). v1: https://lore.kernel.org/lkml/20220829165748.1008477-1-yury.norov@gmail.com/T/#mecbd787f8d1bff1454a4ec2fe46ad6dc168df695 v2: - don't declare nr_cpu_ids if NR_CPUS == 1; - move set_nr_cpu_ids() from smp.h to cpumask.h to avoid errors in some inclusion paths; - drop 'default n' in FORCE_NR_CPUS option description; - rebase on top of v6.0-rc4. Yury Norov (5): smp: don't declare nr_cpu_ids if NR_CPUS == 1 smp: add set_nr_cpu_ids() lib/cpumask: delete misleading comment lib/cpumask: deprecate nr_cpumask_bits lib/cpumask: add FORCE_NR_CPUS config option arch/loongarch/kernel/setup.c | 2 +- arch/mips/kernel/setup.c | 2 +- arch/x86/kernel/smpboot.c | 4 ++-- arch/x86/xen/smp_pv.c | 2 +- include/linux/cpumask.h | 22 +++++++++++----------- kernel/smp.c | 6 ++++-- lib/Kconfig | 9 +++++++++ 7 files changed, 29 insertions(+), 18 deletions(-) -- 2.34.1
Powered by blists - more mailing lists