linux-kernel - Re: [PATCH v2 4/6] stack_tracer: move sysctl registration to kernel/trace/trace

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Message-ID: <20250306103138.3cfc2955@gandalf.local.home>
Date: Thu, 6 Mar 2025 10:31:38 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Joel Granados <joel.granados@...nel.org>
Cc: Kees Cook <kees@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, "David S. Miller" <davem@...emloft.net>,
 Andreas Larsson <andreas@...sler.com>, Heiko Carstens <hca@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Christian Borntraeger
 <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, Gerald
 Schaefer <gerald.schaefer@...ux.ibm.com>, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 sparclinux@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v2 4/6] stack_tracer: move sysctl registration to
 kernel/trace/trace_stack.c

On Thu, 06 Mar 2025 12:29:44 +0100
Joel Granados <joel.granados@...nel.org> wrote:

> Move stack_tracer_enabled into trace_stack_sysctl_table. This is part of
> a greater effort to move ctl tables into their respective subsystems
> which will reduce the merge conflicts in kerenel/sysctl.c.
> 
> Signed-off-by: Joel Granados <joel.granados@...nel.org>
> ---
>  kernel/sysctl.c            | 10 ----------
>  kernel/trace/trace_stack.c | 20 ++++++++++++++++++++
>  2 files changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index baa250e223a26bafc39cb7a7d7635b4f7f5dcf56..dc3747cc72d470662879e4f2b7f2651505b7ca90 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -68,7 +68,6 @@
>  
>  #ifdef CONFIG_X86
>  #include <asm/nmi.h>
> -#include <asm/stacktrace.h>
>  #include <asm/io.h>
>  #endif
>  #ifdef CONFIG_SPARC
> @@ -1674,15 +1673,6 @@ static const struct ctl_table kern_table[] = {
>  		.proc_handler	= proc_dointvec,
>  	},
>  #endif
> -#ifdef CONFIG_STACK_TRACER
> -	{
> -		.procname	= "stack_tracer_enabled",
> -		.data		= &stack_tracer_enabled,
> -		.maxlen		= sizeof(int),
> -		.mode		= 0644,
> -		.proc_handler	= stack_trace_sysctl,
> -	},
> -#endif
>  #ifdef CONFIG_MODULES
>  	{
>  		.procname	= "modprobe",
> diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
> index 14c6f272c4d8a382070d45e1cf0ee97db38831c9..b7ffbc1da8357f9c252cb8936c8f789daa97eb9a 100644
> --- a/kernel/trace/trace_stack.c
> +++ b/kernel/trace/trace_stack.c
> @@ -578,3 +578,23 @@ static __init int stack_trace_init(void)
>  }
>  
>  device_initcall(stack_trace_init);
> +
> +
> +static const struct ctl_table trace_stack_sysctl_table[] = {
> +	{
> +		.procname	= "stack_tracer_enabled",
> +		.data		= &stack_tracer_enabled,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0644,
> +		.proc_handler	= stack_trace_sysctl,
> +	},
> +};
> +
> +static int __init init_trace_stack_sysctls(void)
> +{
> +	register_sysctl_init("kernel", trace_stack_sysctl_table);
> +	return 0;
> +}
> +subsys_initcall(init_trace_stack_sysctls);
> +
> +
> 

This should also make the variable "stack_tracer_enabled" static and
removed from the ftrace.h header.

-- Steve