Re: [PATCH] max3100 driver

From: Ben Pfaff
Date: Sun Sep 21 2008 - 12:06:21 EST


Arjan van de Ven <arjan@xxxxxxxxxxxxx> writes:

> I do have a question though: what does a signed bitfield of 1 mean?
> I mean.. the variables are "int", so signed.... where will the compiler
> store the sign bit???

Whether a bit-field declared as type "int" is signed or unsigned
is compiler implementation-defined. As C99 6.7.2 says (there is
similar text in C89):

...for bit-fields, it is implementation-defined whether the
specifier int designates the same type as signed int or the
same type as unsigned int.

Thus, it is never a good idea to declare a bit-field as plain
"int". Declare it as "signed int" or "unsigned int" instead.
--
"Mon peu de succès près des femmes est toujours venu de les trop aimer."
--Jean-Jacques Rousseau

--
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/