Re: [PATCH] joydev: fix HZ->millisecond transformation

[george anzinger]

Bjorn Helgaas wrote:
> 
> * fix a problem with HZ->millisecond transformation on
>   non-x86 archs (from 2.5 change by [e-mail])
> 
> Applies to 2.4.20.
> 
> diff -Nru a/drivers/input/joydev.c b/drivers/input/joydev.c
> --- a/drivers/input/joydev.c    Mon Dec 16 12:16:32 2002
> +++ b/drivers/input/joydev.c    Mon Dec 16 12:16:32 2002
> @@ -50,6 +50,8 @@
>  #define JOYDEV_MINORS          32
>  #define JOYDEV_BUFFER_SIZE     64
> 
> +#define MSECS(t)       (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
Uh...                                                
^^^^^^^^^^^^^^^^
by definition this is zero, is it not?

> +
>  struct joydev {
>         int exist;
>         int open;
> @@ -134,7 +136,7 @@
>                         return;
>         }
> 
> -       event.time = jiffies * (1000 / HZ);
> +       event.time = MSECS(jiffies);
> 
>         while (list) {
> 
> @@ -279,7 +281,7 @@
> 
>                 struct js_event event;
> 
> -               event.time = jiffies * (1000/HZ);
> +               event.time = MSECS(jiffies);
> 
>                 if (list->startup < joydev->nkey) {
>                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
> 
> -
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-- 
George Anzinger   [e-mail]
High-res-timers: 
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml