linux-kernel - Re: [PATCH 0/5] Remove onstack cpumask var usage

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Date: Fri, 19 Apr 2024 07:13:50 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Dawei Li <dawei.li@...ngroup.cn>
Cc: davem@...emloft.net, andreas@...sler.com, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Remove onstack cpumask var usage

Hi Dawei,

On Thu, Apr 18, 2024 at 06:49:44PM +0800, Dawei Li wrote:
> Hi,
> 
> This series aims at removing on-stack cpumask var usage for sparc arch.
> 
> Generally it's preferable to avoid placing cpumasks on the stack, as
> for large values of NR_CPUS these can consume significant amounts of
> stack space and make stack overflows more likely.

Took a quick look at the patches, looks good except the one the bot
already complained about.
A quick grep shows a few more cases where we have an on-stack cpumask
in sparc code.

kernel/ds.c:    cpumask_t mask;
kernel/leon_kernel.c:   cpumask_t mask;
kernel/leon_smp.c:static void leon_cross_call(void *func, cpumask_t mask, unsigned long arg1,
kernel/sun4d_smp.c:static void sun4d_cross_call(void *func, cpumask_t mask, unsigned long arg1,

Do you plan to look at the other on-stack users too?
It would be nice to see them all gone in one patch-set.

	Sam