> > > How come param is declared as unsigned long then in the body > > > of the ehci_tasklet, it is typecasted as (struct ehci_hcd *)? > > > Should param be declared as (void *param) not unsigned long? > > > > It's declared as "unsigned long" because that's how tasklets work.
(I should have mentioned "struct tasklet_struct" in <linux/interrupt.h> ...) > > If "unsigned long" is bigger than a pointer, the extra bits get safely > > discarded. > > sizeof(unsigned long) is always guaranteed to be equal to sizeof(void *) > on Linux. It's one of the compiler assumptions the kernel makes (there > are some others, and I had a list around here somewhere with them, but I > can't find it right now...it's in the lkml archives from a few years > ago if anyone is interested) It'd be good to see a list of those somewhere in the Documentation directory ... even better to get rid of such assumptions. For what it's worth, the classic assumption was that "sizeof (char *) == sizeof (int)", and I recall it was the BSD VAX UNIXes that started to assume it was "unsigned long" not "int" (back when "void *" didn't exist :). Such assumptions broke where "sizeof (int) == sizeof (short)", and more recently where the codegen models preserve another classic BSD-ism, "sizeof (long) == sizeof (int)" ... I think some current 64bit systems use "sizeof (long long) == sizeof (void *)". - Dave _______________________________________________________________ Have big pipes? SourceForge.net is looking for download mirrors. We supply the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
