Re: [PATCH] VERIFY_OCTAL_PERMISSIONS needs <linux/bug.h>

[Randy Dunlap]

On 12/05/14 16:07, George Spelvin wrote:
> It is possible to include <linux/kernel.h> and try to use
> VERIFY_OCTAL_PERMISSIONS, then puke because BUILD_BUG_ON_ZERO
> isn't defined.
> 
> I hit this via:
> 
> #include <linux/moduleparam.h>
> module_param(verbose, bool, 0);
> 
> IMHO, except in documented special cases, header files should
> #include their own macros' dependencies.

Yes.  Documentation/SubmitChecklist #1:

1: If you use a facility then #include the file that defines/declares
   that facility.  Don't depend on other header files pulling in ones
   that you use.


Thanks.

> Signed-off-by: George Spelvin <linux@xxxxxxxxxxx>
> ---
>  include/linux/kernel.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> I'm not quite sure who to send this via.  Rusty, you touched
> VERIFY_OCTAL_PERMISSIONS last.  Should I send this via you, or collect
> acks and include it in the patch series I'm working on that wants this?
> 
> The workaround is easy enough, but I'd rather fix it than let cruft
> like this accumulate.
> 
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 3d770f55..afb81c1a 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -12,6 +12,7 @@
>  #include <linux/typecheck.h>
>  #include <linux/printk.h>
>  #include <linux/dynamic_debug.h>
> +#include <linux/bug.h>
>  #include <asm/byteorder.h>
>  #include <uapi/linux/kernel.h>
>  
> 


-- 
~Randy
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