linux-kernel - Re: [PATCH] time: Fix constant size in kernel/timeconst.h

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Date:	Sat, 09 Feb 2008 13:33:19 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Johann Felix Soden <johfel@....de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] time: Fix constant size in kernel/timeconst.h

Johann Felix Soden wrote:
> From: Johann Felix Soden <johfel@...rs.sourceforge.net>
> 
> kernel/timeconst.pl generates only long sized constants in timeconst.pl
> which gives this warning:
> 
> kernel/time.c: In function 'msecs_to_jiffies':
> kernel/time.c:472: warning: integer constant is too large for 'long' type
> 
> unsigned long long is needed.
> 

Hm, you've just taken a warning and elevated it to a bug.

According to the C standard, a constant has the shortest type (>= int) 
needed to hold the constant, and the warning above is somewhat bogus in 
that context (what version of gcc is that, anyway?)

ULL is only appropriate to 32-bit machines, or there will be other 
issues downstream.  The Right Way[TM] to do this would be to get Linux 
to have the [U]INTxx_C() macros from C99.

	-hpa

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