Re: [GIT PULL] percpu for 2.6.31

From: Linus Torvalds
Date: Fri Jun 19 2009 - 15:40:56 EST

On Fri, 19 Jun 2009, Ingo Molnar wrote:
> ( Many wont btw: we still dont have lockdep support in all
> architectures - 3 years and counting. It's a highly useful purely
> sw feature with zero hardware dependencies. Fortunately it's
> well-modularized and the functionality is non-essential. Percpu
> allocation is not so lucky as it's essential functionality. )

When it coems to code coverage, x86 matters _so_ much more than any other
architecture, that verification features like lockdep etc are way more
important on x86 than on anything else.

Sure, there may be locking issues in some arch-specific code, and other
architectures could be better off caring. But the advantage of lockdep for
some pissant architecture that has a very limited user base (maybe lots of
chips, but much more limited _use_ - fewer drivers, fewer workloads etc)
is much lower, since those architectures know that x86 will give them 99%
of the coverage.

So it's quite reasonable to think that other architectures simply care

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at