linux-kernel - Re: [PATCH] hpfall.c improvements, thoughts

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Date:	Wed, 20 May 2009 23:04:56 +0200
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Christian Thaeter <ct@...apo.org>
CC:	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hpfall.c improvements, thoughts

Op 25-03-09 22:27, Christian Thaeter schreef:
> Some conversation I had with Pavel,
> 
> imo the example code should be at least barely useable as in not causing
> harm like I sketched in (1.). Maybe someone else picks that up and
> improves it later on. Patch at the end, quite sketchy and imature as it
> doesn't check for errors, but certainly better than before.
> 
Hello Christian,
Would you mind resending the patch with a changelog, so that Andrew can
merge it?

Thanks,
Eric

> 
> Signed-off-by: Christian Thaeter <ct@...apo.org>
Acked-by: Éric Piel <eric.piel@...mplin-utc.net>

> ---
> 
> diff --git a/Documentation/hwmon/hpfall.c b/Documentation/hwmon/hpfall.c
> index bbea1cc..f3cde67 100644
> --- a/Documentation/hwmon/hpfall.c
> +++ b/Documentation/hwmon/hpfall.c
> @@ -16,6 +16,8 @@
>  #include <stdint.h>
>  #include <errno.h>
>  #include <signal.h>
> +#include <sys/mman.h>
> +#include <sched.h>
> 
>  void write_int(char *path, int i)
>  {
> @@ -63,6 +65,7 @@ void ignore_me(void)
>  int main(int argc, char* argv[])
>  {
>         int fd, ret;
> +       struct sched_param param;
> 
>         fd = open("/dev/freefall", O_RDONLY);
>         if (fd < 0) {
> @@ -70,7 +73,12 @@ int main(int argc, char* argv[])
>                 return EXIT_FAILURE;
>         }
> 
> -	signal(SIGALRM, ignore_me);
> +       daemon(0,0);
> +       param.sched_priority = sched_get_priority_max(SCHED_FIFO);
> +       sched_setscheduler(0, SCHED_FIFO, &param);
> +       mlockall(MCL_CURRENT|MCL_FUTURE);
> +
> +       signal(SIGALRM, ignore_me);
> 
>         for (;;) {
>  	       unsigned char count;

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