On May 30,  6:30am, yamt@mwd.biglobe.ne.jp (YAMAMOTO Takashi) wrote:
-- Subject: Re: CVS commit: src/sys/sys

| > Modified Files:
| > 	src/sys/sys: proc.h
| > 
| > Log Message:
| > make ltsleep and wakeup* vars volatile.
| 
| why?

Because many of the variables they are passed in are already volatile,
and there is no way that I know to convert a non-volatile variable to
a volatile. I've been going through the kernel and fixing the volatile
cast-aways, and it seems to me that there is a lot of random volatile
and __volatile use for no good reason. We definitely need to go through
it and clean it up. In this pass, I am making the kernel compile with
-Wcast-qual so we will be able in the future to control better the
volatile casting and propagation.

christos