Re: [PATCH 2/19] UML - Tidy stub management code

[Jeff Dike]

On Sat, Apr 26, 2008 at 06:01:12PM +0800, WANG Cong wrote:
> > +	/*
> > +	 * When the stub stops, we find the following values on the
> > +	 * beginning of the stack:
> > +	 * (long) return_value
> > +	 * (long) offset to failed sycall data (0 if no error)
> > +	 */
> > +	ret = *((unsigned long *) stack);
> 
> 
> I am afraid the value will be truncated on 64bit machine, since
> 'ret' is 'int' while 'stack' points to an 'unsigned long'.
> 
> Is this expected?

That's dubious, but I don't think it breaks anything.  On LE, *(int *)
and *(long *) will give you the same answer, and the value here is an
error code, which fits into 32 bits.

      	    	       Jeff

-- 
Work email - jdike at linux dot intel dot com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/