linux-kernel - Re: [PATCH v2] tty/sysrq: change the definition of sysrq_key

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Date:   Tue, 19 Apr 2022 09:44:55 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Junwen Wu <wudaemon@....com>, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Junwen Wu <wudaemon@...il.com>
Subject: Re: [PATCH v2] tty/sysrq: change the definition of sysrq_key_table's
 element to make it more readable

On 18. 04. 22, 17:37, Junwen Wu wrote:
> From: Junwen Wu <wudaemon@...il.com>
> 
> The definition of sysrq_key_table's elements, like sysrq_thaw_op and
> sysrq_showallcpus_op are not consistent with sysrq_ftrace_dump_op,
> Consistency makes code more readable.

Reviewed-by: Jiri Slaby <jirislaby@...nel.org>

> Signed-off-by: Junwen Wu <wudaemon@...il.com>
> ---
> V1 -> V2: Fix some commit message's error
> 
>   drivers/tty/sysrq.c | 14 ++++++--------
>   1 file changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
> index bbfd004449b5..9485156bf48b 100644
> --- a/drivers/tty/sysrq.c
> +++ b/drivers/tty/sysrq.c
> @@ -274,6 +274,8 @@ static const struct sysrq_key_op sysrq_showallcpus_op = {
>   	.action_msg	= "Show backtrace of all active CPUs",
>   	.enable_mask	= SYSRQ_ENABLE_DUMP,
>   };
> +#else
> +#define sysrq_showallcpus_op (*(const struct sysrq_key_op *)NULL)
>   #endif
>   
>   static void sysrq_handle_showregs(int key)
> @@ -405,6 +407,7 @@ static const struct sysrq_key_op sysrq_moom_op = {
>   	.enable_mask	= SYSRQ_ENABLE_SIGNAL,
>   };
>   
> +#ifdef CONFIG_BLOCK
>   static void sysrq_handle_thaw(int key)
>   {
>   	emergency_thaw_all();
> @@ -415,6 +418,9 @@ static const struct sysrq_key_op sysrq_thaw_op = {
>   	.action_msg	= "Emergency Thaw of all frozen filesystems",
>   	.enable_mask	= SYSRQ_ENABLE_SIGNAL,
>   };
> +#else
> +#define sysrq_thaw_op (*(const struct sysrq_key_op *)NULL)
> +#endif
>   
>   static void sysrq_handle_kill(int key)
>   {
> @@ -468,17 +474,9 @@ static const struct sysrq_key_op *sysrq_key_table[62] = {
>   	NULL,				/* g */
>   	NULL,				/* h - reserved for help */
>   	&sysrq_kill_op,			/* i */
> -#ifdef CONFIG_BLOCK
>   	&sysrq_thaw_op,			/* j */
> -#else
> -	NULL,				/* j */
> -#endif
>   	&sysrq_SAK_op,			/* k */
> -#ifdef CONFIG_SMP
>   	&sysrq_showallcpus_op,		/* l */
> -#else
> -	NULL,				/* l */
> -#endif
>   	&sysrq_showmem_op,		/* m */
>   	&sysrq_unrt_op,			/* n */
>   	/* o: This will often be registered as 'Off' at init time */


-- 
js
suse labs