linux-kernel - Re: [PATCH v4 -next 14/15] sh: vdso: move the sysctl to arch/sh/kernel/vsyscall/vsyscall.c

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Message-ID: <eiskmyz22ckjfmsxztt7a6m7e4sktp226j4hjktuggyqb4jirc@2rqxvgoq4v55>
Date: Mon, 6 Jan 2025 12:59:25 +0100
From: Joel Granados <joel.granados@...nel.org>
To: Kaixiong Yu <yukaixiong@...wei.com>
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Subject: Re: [PATCH v4 -next 14/15] sh: vdso: move the sysctl to
 arch/sh/kernel/vsyscall/vsyscall.c

On Sat, Dec 28, 2024 at 10:57:45PM +0800, Kaixiong Yu wrote:
> When CONFIG_SUPERH and CONFIG_VSYSCALL are defined,
> vdso_enabled belongs to arch/sh/kernel/vsyscall/vsyscall.c.
> So, move it into its own file. After this patch is applied,
> all sysctls of vm_table would be moved. So, delete vm_table.
> 
> Signed-off-by: Kaixiong Yu <yukaixiong@...wei.com>
> Reviewed-by: Kees Cook <kees@...nel.org>
> ---
> v4:
>  - const qualify struct ctl_table vdso_table
> v3:
>  - change the title
> ---
> ---
>  arch/sh/kernel/vsyscall/vsyscall.c | 14 ++++++++++++++
>  kernel/sysctl.c                    | 14 --------------
>  2 files changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/sh/kernel/vsyscall/vsyscall.c b/arch/sh/kernel/vsyscall/vsyscall.c
> index add35c51e017..898132f34e6a 100644
> --- a/arch/sh/kernel/vsyscall/vsyscall.c
> +++ b/arch/sh/kernel/vsyscall/vsyscall.c
> @@ -14,6 +14,7 @@
>  #include <linux/module.h>
>  #include <linux/elf.h>
>  #include <linux/sched.h>
> +#include <linux/sysctl.h>
>  #include <linux/err.h>
>  
>  /*
> @@ -30,6 +31,17 @@ static int __init vdso_setup(char *s)
>  }
>  __setup("vdso=", vdso_setup);
>  
> +static const struct ctl_table vdso_table[] = {
> +	{
> +		.procname	= "vdso_enabled",
> +		.data		= &vdso_enabled,
> +		.maxlen		= sizeof(vdso_enabled),
> +		.mode		= 0644,
> +		.proc_handler	= proc_dointvec,
> +		.extra1		= SYSCTL_ZERO,
> +	},
> +};
> +
>  /*
>   * These symbols are defined by vsyscall.o to mark the bounds
>   * of the ELF DSO images included therein.
> @@ -55,6 +67,8 @@ int __init vsyscall_init(void)
>  	       &vsyscall_trapa_start,
>  	       &vsyscall_trapa_end - &vsyscall_trapa_start);
>  
> +	register_sysctl_init("vm", vdso_table);
> +
>  	return 0;
>  }
>  
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 7ff07b7560b4..cebd0ef5d19d 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -2012,23 +2012,9 @@ static struct ctl_table kern_table[] = {
>  #endif
>  };
>  
As you mentioned in the commit message, this patch has two objectives.
1. It moves the vdso_enabled table and 2. It removes the vm_table.
Please separate these two in such a way that the second (removal of
vm_table) can be done at the end and is not related to any particular
table under vm_table. I prefer it that way so that the removal of
vm_table does not block the upstreaming of a move that is already
reviewed and ready.


> -static struct ctl_table vm_table[] = {
> -#if defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)
> -	{
> -		.procname	= "vdso_enabled",
> -		.data		= &vdso_enabled,
> -		.maxlen		= sizeof(vdso_enabled),
> -		.mode		= 0644,
> -		.proc_handler	= proc_dointvec,
> -		.extra1		= SYSCTL_ZERO,
> -	},
> -#endif
> -};
> -
>  int __init sysctl_init_bases(void)
>  {
>  	register_sysctl_init("kernel", kern_table);
> -	register_sysctl_init("vm", vm_table);
>  
>  	return 0;
>  }
> -- 
> 2.34.1
> 

-- 

Joel Granados