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| author | Ross Biro <ross.biro@gmail.com> | 2006-01-11 22:43:51 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:04:52 -0800 |
| commit | 79c62cf1789f935280138b412bb750be84aec747 (patch) | |
| tree | 24c522ed0dd3dba942f1db43048205b0973aa7c8 /arch | |
| parent | e4e94072d9c3b19662537cbd5e2d37bcaeed3d9b (diff) | |
| download | op-kernel-dev-79c62cf1789f935280138b412bb750be84aec747.zip op-kernel-dev-79c62cf1789f935280138b412bb750be84aec747.tar.gz | |
[PATCH] x86_64: Make udelay more accurate
The attempt to avoid overflow in __delay caused varying precision
on different CPUs depending on differences in the CPU speed.
We should be able to do this multiplication with out overflowing
provided the
cpu is running at less than about 128 GHz. xloops < 20000 * 0x10c6.
loops_per_jiffy * HZ <= cpu_clock_speed. So if the cpu clock speed
< 2^64/(20000 * 0x10c6) = 2^64/ 51E6CC0 < 2^64/2^27 = 2^37 = 128G we
will not overflow the calculation.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/lib/delay.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86_64/lib/delay.c b/arch/x86_64/lib/delay.c index 841bd73..03c460c 100644 --- a/arch/x86_64/lib/delay.c +++ b/arch/x86_64/lib/delay.c @@ -39,7 +39,7 @@ void __delay(unsigned long loops) inline void __const_udelay(unsigned long xloops) { - __delay(((xloops * cpu_data[raw_smp_processor_id()].loops_per_jiffy) >> 32) * HZ); + __delay((xloops * HZ * cpu_data[raw_smp_processor_id()].loops_per_jiffy) >> 32); } void __udelay(unsigned long usecs) |
