linux-kernel - (regression) kernel/timeconst.h bugs with HZ=128

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Message-Id: <20080226183224.DE5BB8DE50@adsl-69-226-248-13.dsl.pltn13.pacbell.net>
Date:	Tue, 26 Feb 2008 10:32:24 -0800
From:	David Brownell <david-b@...bell.net>
To:	linux-kernel@...r.kernel.org
Subject: (regression) kernel/timeconst.h bugs with HZ=128

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 ...

- Dave

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