Re: [PATCH] Use uname not sysctl to get the kernel revision

Eric W. Biederman wrote:
[]
> Glibc just wants to know if our kernel is SMP so it can know if it is
> ok to busy wait for a bit waiting for a mutex.  Or if busy waiting is
> a complete loss.

BTW, with smp-alternatives thing merged, "SMP or not" may not be that
simple question anymore.

I for one stopped compiling UP and SMP kernels for x86 since 2.6.17,
because SMP kernel works just fine on UP, including benchmarks (as
opposed to SMP kernel w/o smp-alternatives).  But I don't remember
if uname shows SMP in this case or not (don't have any running UP
machine with that kernel right now).

But the thing is: smp-alternatives + cpu-hotplug changes things at
runtime...

/mjt
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References:
- Re: [PATCH] Use uname not sysctl to get the kernel revision
  - From: Roland McGrath <[email protected]>
- Re: [PATCH] Use uname not sysctl to get the kernel revision
  - From: Ulrich Drepper <[email protected]>
- Re: [PATCH] Use uname not sysctl to get the kernel revision
  - From: Jakub Jelinek <[email protected]>
- Re: [PATCH] Use uname not sysctl to get the kernel revision
  - From: "H. Peter Anvin" <[email protected]>
- Re: [PATCH] Use uname not sysctl to get the kernel revision
  - From: [email protected] (Eric W. Biederman)

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