On Fri, Jan 18, 2008 at 11:51:39AM +1100, Rusty Russell wrote:
>With a little macro ugliness, we can make kthread_create() and
>kthread_run() typesafe: avoid the casts to and from void *. To do
>this we use a temporary function pointer which takes the type of the
>data as a callback: if the function doesn't match, we get:
>
> warning: initialization from incompatible pointer type
>
>It's actually slightly over-strict, since a void * would be compatible
>with any function type, but there's only one such case in the kernel
>anyway.
{snip}
>+#define kthread_create(threadfn, data, namefmt...) ({ \
>+ int (*_threadfn)(typeof(data)) = (threadfn); \
>+ __kthread_create((void *)_threadfn, (data), namefmt); \
>+})
>+
>+struct task_struct *__kthread_create(int (*threadfn)(void *data),
>+ void *data,
>+ const char namefmt[], ...);
Rusty, excellent work!!
I really like this. It is a good trick, neat and clean.
Thanks.
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