linux-kernel - Re: [PATCH 1/1] Input: sysrq -- ensure sysrq_enabled and __sysrq

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Date:	Mon, 24 Jan 2011 08:03:35 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	Dmitry Torokhov <dtor@...l.ru>, linux-input@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Input: sysrq -- ensure sysrq_enabled and
 __sysrq_enabled are consistent

On Mon, 24 Jan 2011 14:06:12 +0000 Andy Whitcroft wrote:

> Currently sysrq_enabled and __sysrq_enabled are initialised separatly
> and inconsitantly, leading to sysrq being actually enabled by reported
> as not enabled in sysfs.  The first change to the sysfs configurable
> synchronises these two:
> 
>     static int __read_mostly sysrq_enabled = 1;
>     static int __sysrq_enabled;
> 
> Add a common define to carry the default for these preventing them becoming
> out of sync again.  Default this to 1 to mirror previous behaviour.
> 
> Signed-off-by: Andy Whitcroft <apw@...onical.com>
> ---
>  drivers/tty/sysrq.c   |    2 +-
>  include/linux/sysrq.h |    3 +++
>  kernel/sysctl.c       |    3 ++-
>  3 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
> index c556ed9..8e0dd25 100644
> --- a/drivers/tty/sysrq.c
> +++ b/drivers/tty/sysrq.c
> @@ -46,7 +46,7 @@
>  #include <asm/irq_regs.h>
>  
>  /* Whether we react on sysrq keys or just ignore them */
> -static int __read_mostly sysrq_enabled = 1;
> +static int __read_mostly sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
>  static bool __read_mostly sysrq_always_enabled;
>  
>  static bool sysrq_on(void)
> diff --git a/include/linux/sysrq.h b/include/linux/sysrq.h
> index 387fa7d..7faf933 100644
> --- a/include/linux/sysrq.h
> +++ b/include/linux/sysrq.h
> @@ -17,6 +17,9 @@
>  #include <linux/errno.h>
>  #include <linux/types.h>
>  
> +/* Enable/disable SYSRQ support by default (0==no, 1==yes). */
> +#define SYSRQ_DEFAULT_ENABLE	1
> +
>  /* Possible values of bitmask for enabling sysrq functions */
>  /* 0x0001 is reserved for enable everything */
>  #define SYSRQ_ENABLE_LOG	0x0002
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index bc86bb3..0f1bd83 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -170,7 +170,8 @@ static int proc_taint(struct ctl_table *table, int write,
>  #endif
>  
>  #ifdef CONFIG_MAGIC_SYSRQ
> -static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
> +/* Note: sysrq code uses it's own private copy */

                            its

Meta-comment:  There's no good reason to have patch 0/1.  Just put all of the
patch description in patch 1/1.


> +static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
>  
>  static int sysrq_sysctl_handler(ctl_table *table, int write,
>  				void __user *buffer, size_t *lenp,
> -- 


---
~Randy
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