Messages in this thread | | | Date | Fri, 27 Jan 2006 11:37:49 +0100 | From | Eric Dumazet <> | Subject | Re: 2.6.16-rc1-mm3 |
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Andy Whitcroft a écrit : > Eric Dumazet wrote: >> The NULL choice was maybe wrong. We might need more than one page to >> fully catch all accesses. Something like 32KB. > > The crash behavoir is handy to catch that the problem exists, and is > very cheap (0 cost) at run time. However, once its known I think we > need something more targetted to allow tracking of the cause. Perhaps > we could set the offset thingy to -1 or something and simply do > something like the following in per_cpu(): > > if (__per_cpu_offset[i] == -1) > BUG(); > else > *RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]) >
Yes we can set __per_cpu_offset[not_possible_cpu] to 0, because [__per_cpu_start,__per_cpu_end) is in init section and should be discarded in free_initmem(). I'm not sure if the freed virtual space can later be reused.
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