Re: [PATCH 1/4] LOG2: Implement a general integer log2 facility in the kernel [try #4]
From: Arnd Bergmann
Date: Mon Oct 09 2006 - 06:28:22 EST
On Monday 09 October 2006 11:51, Kyle Moffett wrote:
> #if defined(CONFIG_ARCH_HAS_64BIT_WORD)
> typedef unsigned long __u64;
> typedef signed long __s64;
> #elif defined(__GNUC__)
> __extension__ typedef unsigned long long __u64;
> __extension__ typedef signed long long __s64;
> #endif
>
Well, some architectures currently expext __u64/__s64 to be
long long even with 64 bits. Changing that will likely cause
a number of new compiler warnings about conversion between
these. Of course it would be nice to clean these up, since
it's already a pain to printk() a variable of type u64.
More importantly, your code has the problem that it relies
on a CONFIG_* symbol, which will break when user space includes
the file, because that does not have config.h.
Arnd <><
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