Re: [PATCH] fix BUILD_BUG_ON() and a couple of bogus uses of it

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: David Miller <davem@xxxxxxxxxxxxx>
Date: Thu, 17 Sep 2009 17:31:54 -0700 (PDT)

> From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Date: Thu, 17 Sep 2009 17:15:04 -0700
> 
>> There's a shortcoming in the current BUILD_BUG_ON() - it silently does
>> nothing if passed a non-constant arg.
>> 
>> I suspect that in the 2.6.31 code, that BUILD_BUG_ON() just does
>> nothing at all, and that Jan's patch is now exposing this.  It might be
>> compiler-version dependent too.
>> 
>> 
>> <tests it>
>> 
>> Yup, on base 2.6.31, this:
> 
> Ok, I'll have to either change this function to a macro or
> get rid of the check.

I can't even get GCC to see the constant evaluated by is_power_of_2().

I give up, I'll just remove the BUILD_BUG_ON() entirely.
--
To unsubscribe from this list: send the line "unsubscribe sparclinux" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Kernel Development]     [DCCP]     [Linux ARM Development]     [Linux]     [Photo]     [Yosemite Help]     [Linux ARM Kernel]     [Linux SCSI]     [Linux x86_64]     [Linux Hams]

  Powered by Linux