Messages in this thread | | | Subject | Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs | From | Valdis.Kletnieks@vt ... | Date | Wed, 04 May 2011 16:21:39 -0400 |
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On Wed, 04 May 2011 15:04:39 CDT, Christoph Lameter said: > On Wed, 4 May 2011, Linus Torvalds wrote:
> > But cmpxchg DOES NOT MAKE SENSE without atomicity guarantees. > > This is not a real cmpxchg after all. Its not atomic in the sense of > other functions. Its only "percpu atomic" if you want it that way. This is > *not* a full cmpxchg_double().
Calling it a cmpxchg when it doesn't have the primary distinguishing property of a hardware cmpxchg is just loading a bullet in the chamber and inviting kernel hackers to point it at their feet...
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