On Wed, 16 Oct 2013 13:53:56 +0200
Frederic Weisbecker <fweis...@gmail.com> wrote:
> static int done;
>
> if (!done) {
> trace_printk(something);
> trace_printk(something else);
> trace_dump_stack();
> done = 1;
> }
>
> Having a DO_ONCE() would help a lot I think.
>
> Now we can rename it to __DO_ONCE() and put a big fat comment to avoid it
> to be misused.
I wonder if we should make it just ONCE(), with no arguments that
should go into an if statement.
if (ONCE())
do_this_function_once();
Where ONCE() is:
({
static int __once;
int __old_once = __once;
__once = 1;
__old_once;
})
Or the xchg version:
({
static int __once;
if (!__once)
xchg(&__once, 1);
else
1;
})
-- Steve
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