lkml.org 
[lkml]   [2005]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ck] [PATCH] Timer Top was: i386 No-Idle-Hz aka Dynamic-Ticks 3
On Thu, Aug 04 2005, Daniel Petrini wrote:
> +static LIST_HEAD(timer_list);
> +
> +struct timer_top_info {
> + unsigned int func_pointer;
> + unsigned int long counter;
> + struct list_head list;
> +};
> +
> +struct timer_top_info top_info;
> +
> +int account_timer(unsigned int function, struct timer_top_info * top_info)
> +{
> + struct timer_top_info *top;
> +
> + list_for_each_entry (top, &timer_list, list) {
> + /* if it is in the list increment its count */
> + if (top->func_pointer == function) {
> + top->counter += 1;
> + return 0;
> + }
> + }

What protects this list?

> +
> + /* if you are here then it didnt find so inserts in the list */
> +
> + top = kmalloc(sizeof(struct timer_top_info), GFP_KERNEL);
> + if (!top)
> + return -ENOMEM;

You can't use GFP_KERNEL here, you are inside the timer base lock.

--
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-08-05 08:51    [W:0.256 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site