Re: Totally broken PCI PM calls

[Pavel Machek <pavel@suse.cz>]

Hi!

> > I'm trying to learn how to work with bitwise on obsolete stuff, but
> > checking there is good, too, right?
> > 
> > Is this right way to do it?
> > 
> > +typedef enum pm_request __bitwise {
> > +       __bitwise PM_SUSPEND, /* enter D1-D3 */
> > +       __bitwise PM_RESUME,  /* enter D0 */
> > +} pm_request_t;
> 
> No, "__bitwise" is a type attribute, so you'd have to do it something like 
> this:

Ok, after -Wbitwise for sparse, strict typechecking seems to
work. Unfortunately, it produces a *lot* of noise, for code such as

static ssize_t disk_show(struct subsystem * subsys, char * buf)
{
        return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}

...where pm_disk_mode is __bitwise. That is not really what we
want. Would it be possible to get something similar to __bitwise where
arithmetic is still okay to do? With __bitwise, I'd need to do:

@@ -292,15 +297,15 @@
        int i;
        int len;
        char *p;
-       u32 mode = 0;
+       suspend_disk_method_t mode = 0;

        p = memchr(buf, '\n', n);
        len = p ? p - buf : n;

        down(&pm_sem);
-       for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
+       for (i = (int __force) PM_DISK_FIRMWARE; i < (int __force) PM_DISK_MAX; i++) {
                if (!strncmp(buf, pm_disk_modes[i], len)) {
-                       mode = i;
+                       mode = (suspend_disk_method_t __force) i;
                        break;
                }
        }


...thats ugly.

								Pavel
-- 
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