linux-kernel - Re: [PATCH 1/1] sched: preempt: Move dynamic keys into kernel/sched

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-prev] [day] [month] [year] [list]

Message-ID: <7d8b517f-3122-446e-aa72-ce0dd99a9a27@linux.ibm.com>
Date: Fri, 13 Jun 2025 15:19:11 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: maddy@...ux.ibm.com, catalin.marinas@....com
Cc: tglx@...utronix.de, bigeasy@...utronix.de, vschneid@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        Christophe Leroy <christophe.leroy@...roup.eu>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org
Subject: Re: [PATCH 1/1] sched: preempt: Move dynamic keys into kernel/sched

+Cristope Leroy.

On 6/10/25 13:23, Shrikanth Hegde wrote:
> Dynamic preemption can be static key or static call based.
> Static key is used to check kernel preemption depending on
> the current preemption model. i.e enable for lazy, full.
> 
> Code is spread currently across entry/common.c, arm64 and latest being
> powerpc. There is little arch specific to it. For example, arm64,
> powerpc does the same thing. It is better to move it into kernel/sched
> since preemption is more closely associated with scheduler.
> 
> Plus, Any new arch that wants dynamic preemption enabled need to have
> only HAVE_PREEMPT_DYNAMIC_KEY.
> 
> This is more of code movement. No functional change.
> 
> Suggested-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
> ---
>   arch/arm64/include/asm/preempt.h   |  1 -
>   arch/arm64/kernel/entry-common.c   |  8 --------
>   arch/powerpc/include/asm/preempt.h | 16 ----------------
>   arch/powerpc/kernel/interrupt.c    |  4 ----
>   include/linux/entry-common.h       |  1 -
>   include/linux/sched.h              |  8 ++++++++
>   kernel/entry/common.c              |  1 -
>   kernel/sched/core.c                |  4 ++++
>   8 files changed, 12 insertions(+), 31 deletions(-)
>   delete mode 100644 arch/powerpc/include/asm/preempt.h

Hi. Catalin, Maddy,

Does respective arch changes seem ok?