Messages in this thread | | | Date | Fri, 3 Mar 2006 15:06:16 +1100 | From | Paul Mackerras <> | Subject | Re: jiffies_64 vs. jiffies |
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Atsushi Nemoto writes:
> Hi. I noticed that the 'jiffies' variable has 'wall_jiffies + 1' > value in most of time. I'm using MIPS platform but I think this is > same for other platforms. > > I suppose this is due to gcc does not know that jiffies_64 and jiffies > share same place.
I can confirm that the same thing happens on powerpc, both 32-bit and 64-bit. The compiler loads up jiffies, jiffies_64 and wall_jiffies into registers before storing back the incremented value into jiffies_64 and then updating wall_jiffies.
Thanks for finding that, it explains some other strange things that I have seen happen.
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