Re: [PATCH v4 2/2] livepatch: Convert timeouts to secs_to_jiffies()

[Christophe Leroy <christophe.leroy@xxxxxxxxxx>]

Le 18/12/2024 à 00:09, Easwar Hariharan a écrit :
> Commit b35108a51cf7 ("jiffies: Define secs_to_jiffies()") introduced
> secs_to_jiffies(). As the value here is a multiple of 1000, use
> secs_to_jiffies() instead of msecs_to_jiffies to avoid the multiplication.
>
> This is converted using scripts/coccinelle/misc/secs_to_jiffies.cocci with
> the following Coccinelle rules:
>
> @@ constant C; @@
>
> - msecs_to_jiffies(C * 1000)
> + secs_to_jiffies(C)
>
> @@ constant C; @@
>
> - msecs_to_jiffies(C * MSEC_PER_SEC)
> + secs_to_jiffies(C)
>
> While here, replace the schedule_delayed_work() call with a 0 timeout
> with an immediate schedule_work() call.
>
> Signed-off-by: Easwar Hariharan <eahariha@xxxxxxxxxxxxxxxxxxx>

Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>

> ---
>   samples/livepatch/livepatch-callbacks-busymod.c |  3 +--
>   samples/livepatch/livepatch-shadow-fix1.c       |  3 +--
>   samples/livepatch/livepatch-shadow-mod.c        | 15 +++++----------
>   3 files changed, 7 insertions(+), 14 deletions(-)
>
> diff --git a/samples/livepatch/livepatch-callbacks-busymod.c b/samples/livepatch/livepatch-callbacks-busymod.c
> index 378e2d40271a..0220f7715fcc 100644
> --- a/samples/livepatch/livepatch-callbacks-busymod.c
> +++ b/samples/livepatch/livepatch-callbacks-busymod.c
> @@ -44,8 +44,7 @@ static void busymod_work_func(struct work_struct *work)
>   static int livepatch_callbacks_mod_init(void)
>   {
>   	pr_info("%s\n", __func__);
> -	schedule_delayed_work(&work,
> -		msecs_to_jiffies(1000 * 0));
> +	schedule_work(&work);
>   	return 0;
>   }
>   
> diff --git a/samples/livepatch/livepatch-shadow-fix1.c b/samples/livepatch/livepatch-shadow-fix1.c
> index 6701641bf12d..f3f153895d6c 100644
> --- a/samples/livepatch/livepatch-shadow-fix1.c
> +++ b/samples/livepatch/livepatch-shadow-fix1.c
> @@ -72,8 +72,7 @@ static struct dummy *livepatch_fix1_dummy_alloc(void)
>   	if (!d)
>   		return NULL;
>   
> -	d->jiffies_expire = jiffies +
> -		msecs_to_jiffies(1000 * EXPIRE_PERIOD);
> +	d->jiffies_expire = jiffies + secs_to_jiffies(EXPIRE_PERIOD);
>   
>   	/*
>   	 * Patch: save the extra memory location into a SV_LEAK shadow
> diff --git a/samples/livepatch/livepatch-shadow-mod.c b/samples/livepatch/livepatch-shadow-mod.c
> index 7e753b0d2fa6..5d83ad5a8118 100644
> --- a/samples/livepatch/livepatch-shadow-mod.c
> +++ b/samples/livepatch/livepatch-shadow-mod.c
> @@ -101,8 +101,7 @@ static __used noinline struct dummy *dummy_alloc(void)
>   	if (!d)
>   		return NULL;
>   
> -	d->jiffies_expire = jiffies +
> -		msecs_to_jiffies(1000 * EXPIRE_PERIOD);
> +	d->jiffies_expire = jiffies + secs_to_jiffies(EXPIRE_PERIOD);
>   
>   	/* Oops, forgot to save leak! */
>   	leak = kzalloc(sizeof(*leak), GFP_KERNEL);
> @@ -152,8 +151,7 @@ static void alloc_work_func(struct work_struct *work)
>   	list_add(&d->list, &dummy_list);
>   	mutex_unlock(&dummy_list_mutex);
>   
> -	schedule_delayed_work(&alloc_dwork,
> -		msecs_to_jiffies(1000 * ALLOC_PERIOD));
> +	schedule_delayed_work(&alloc_dwork, secs_to_jiffies(ALLOC_PERIOD));
>   }
>   
>   /*
> @@ -184,16 +182,13 @@ static void cleanup_work_func(struct work_struct *work)
>   	}
>   	mutex_unlock(&dummy_list_mutex);
>   
> -	schedule_delayed_work(&cleanup_dwork,
> -		msecs_to_jiffies(1000 * CLEANUP_PERIOD));
> +	schedule_delayed_work(&cleanup_dwork, secs_to_jiffies(CLEANUP_PERIOD));
>   }
>   
>   static int livepatch_shadow_mod_init(void)
>   {
> -	schedule_delayed_work(&alloc_dwork,
> -		msecs_to_jiffies(1000 * ALLOC_PERIOD));
> -	schedule_delayed_work(&cleanup_dwork,
> -		msecs_to_jiffies(1000 * CLEANUP_PERIOD));
> +	schedule_delayed_work(&alloc_dwork, secs_to_jiffies(ALLOC_PERIOD));
> +	schedule_delayed_work(&cleanup_dwork, secs_to_jiffies(CLEANUP_PERIOD));
>   
>   	return 0;
>   }