Keep in mind, too, that for the kernel we don't care about the full C standard but a subset. We rely on extrastandard behavior all over the place. For all ABIs supported by the kernel, sizeof(_Book) == 1 and so everything is sane. On February 27, 2014 12:25:29 AM PST, Borislav Petkov <bp@xxxxxxxxx> wrote: >On Wed, Feb 26, 2014 at 07:42:37PM -0800, H. Peter Anvin wrote: >> sizeof(_Bool), like for many other types, is ABI-dependent, but that >> doesn't mean it is illegitimate. >> >> I don't think C99 says that it is invalid (which means C99 doesn't >> permit is to be a packed bitmap.) > >Ok, but what can be said about the __pcpu_size_call() use case where we >do sizeof(bool)? We have there accessors for sizes 1,2,4 and 8. Can we >simply assume that the ABI will give us a size of bool which is one of >those? > >What if sizeof(bool) is 3? > >Or, are we saying that sizeof(bool) will always be of some natural, >native size like byte, short, int or long so we're good there? > >Thanks. -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-sparse" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
