Use guards to reduce gotos and simplify control flow.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/sched/core.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1801,7 +1801,8 @@ static int sysctl_sched_uclamp_handler(s
 	int old_min, old_max, old_min_rt;
 	int result;
 
-	mutex_lock(&uclamp_mutex);
+	guard(mutex)(&uclamp_mutex);
+
 	old_min = sysctl_sched_uclamp_util_min;
 	old_max = sysctl_sched_uclamp_util_max;
 	old_min_rt = sysctl_sched_uclamp_util_min_rt_default;
@@ -1810,7 +1811,7 @@ static int sysctl_sched_uclamp_handler(s
 	if (result)
 		goto undo;
 	if (!write)
-		goto done;
+		return result;
 
 	if (sysctl_sched_uclamp_util_min > sysctl_sched_uclamp_util_max ||
 	    sysctl_sched_uclamp_util_max > SCHED_CAPACITY_SCALE	||
@@ -1846,16 +1847,12 @@ static int sysctl_sched_uclamp_handler(s
 	 * Otherwise, keep it simple and do just a lazy update at each next
 	 * task enqueue time.
 	 */
-
-	goto done;
+	return result;
 
 undo:
 	sysctl_sched_uclamp_util_min = old_min;
 	sysctl_sched_uclamp_util_max = old_max;
 	sysctl_sched_uclamp_util_min_rt_default = old_min_rt;
-done:
-	mutex_unlock(&uclamp_mutex);
-
 	return result;
 }
 #endif

On Mon, Jun 12, 2023 at 11:07:19AM +0200, Peter Zijlstra wrote:
> @@ -1810,7 +1811,7 @@ static int sysctl_sched_uclamp_handler(s
>  	if (result)
>  		goto undo;
>  	if (!write)
> -		goto done;
> +		return result;

This would be nicer as a "return 0;"

>  
>  	if (sysctl_sched_uclamp_util_min > sysctl_sched_uclamp_util_max ||
>  	    sysctl_sched_uclamp_util_max > SCHED_CAPACITY_SCALE	||
> @@ -1846,16 +1847,12 @@ static int sysctl_sched_uclamp_handler(s
>  	 * Otherwise, keep it simple and do just a lazy update at each next
>  	 * task enqueue time.
>  	 */
> -
> -	goto done;
> +	return result;

This is a return 0 as well.

regards,
dan carpenter

>  
>  undo:
>  	sysctl_sched_uclamp_util_min = old_min;
>  	sysctl_sched_uclamp_util_max = old_max;
>  	sysctl_sched_uclamp_util_min_rt_default = old_min_rt;
> -done:
> -	mutex_unlock(&uclamp_mutex);
> -
>  	return result;
>  }