Re: More cleanups for swsusp

[Pavel Machek <pavel@suse.cz>]

Hi!

> > +	BUG_ON (sizeof(struct link) != PAGE_SIZE);
> 
> Looking at the code, this hardly seems worth checking.  But the compiler
> should just rub this code out anwyay, so whatever.
> 
> hmm, one could do:
> 
> #define compile_time_assert(expr)					\
> 	do {								\
> 		if (!(expr))						\
> 			compile_time_assert_failed();	/* undefined */	\
> 	} while (0)

Well, if you provide such macro, I'll be happy to use it ;-). It
should be something like 

compile_time_assert(expr, "message")

because with more of these are in the code, it would be nightmare to
find out which one is wrong.

Perhaps better name, too?

pavel@elonex:/tmp$ cat delme.c

#define COMPILE_ERR_ON(expr, message) \
        do { if (!(expr)) compile_time_assert_failed_##message(); } while (0)

void main(void)
{
        COMPILE_ERR_ON(0==8, cpu_broke_zeros_neck);
        COMPILE_ERR_ON(0==0, compiler_went_crazy);
}
pavel@elonex:/tmp$ gcc delme.c -o delme
delme.c: In function `main':
delme.c:6: warning: return type of `main' is not `int'
/tmp/ccAx2alr.o(.text+0x11): In function `main':
: undefined reference to `compile_time_assert_failed_cpu_broke_zeros_neck'
collect2: ld returned 1 exit status
pavel@elonex:/tmp$



								Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]