Re: (regression) kernel/timeconst.h bugs with HZ=128

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 26 Feb 2008 10:32:24 -0800 David Brownell <david-b@pacbell.net> wrote:

> I see these warnings on 32 bit ARM systems:
> 
>   CC      kernel/time.o
> kernel/time.c: In function 'msecs_to_jiffies':
> kernel/time.c:472: warning: integer constant is too large for 'long' type
> kernel/time.c: In function 'usecs_to_jiffies':
> kernel/time.c:487: warning: integer constant is too large for 'long' type
> 
> Line 472: 
> 	return ((u64)MSEC_TO_HZ_MUL32 * m + MSEC_TO_HZ_ADJ32)
> line 487:
> 	return ((u64)USEC_TO_HZ_MUL32 * u + USEC_TO_HZ_ADJ32)
> 
> The problem seems to be that these constants from kernel/timeconst.h
> have too many digits:
> 
> #define ONLY_THIRTYTWO_BITS	0x01234567
> 
> #define MSEC_TO_HZ_ADJ32        0x3f7ced916
> #define USEC_TO_HZ_ADJ32        0xfffbce4217d
> 
> Those *_ADJ32 constants should have "ULL" suffixes, yes?
> Adding that by hand resolves the problem, but only until
> the next time that header file gets regenerated.
> 
> Someone with observable Perl-fu should fix this ...
> 

(cc's added)