Re: compiler warnings and syscall macros

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <3F6F6B1B.9040609@nortelnetworks.com>
By author:    Chris Friesen <cfriesen@nortelnetworks.com>
In newsgroup: linux.dev.kernel
>
> 
> I'm trying to figure something out.  For ppc, in asm/unistd.h, 
> __syscall_nr is defined as:
> 
> 
> #define __syscall_nr(nr, type, name, args...)	\
> 	unsigned long __sc_ret, __sc_err;	\
> 	{					\
> <snipped for brevity>
> 	}					\
> 	if (__sc_err & 0x10000000)		\
> 	{					\
> 		errno = __sc_ret;		\
> 		__sc_ret = -1;			\
> 	}					\
> 	return (type) __sc_ret
> 
> 
> Whenever I use this in my code, I get compiler warnings about the 
> statment "__sc_ret = -1" since it is assigning a negative value to an 
> unsigned int.

Just do:

__sc_ret = -1UL;

	-hpa

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