On Thu, 10 Nov 2005, Andrew Morton wrote:
> Hugh Dickins <[email protected]> wrote:
> > On Thu, 10 Nov 2005, Ingo Molnar wrote:
> > >
> > > yuck. What is the real problem btw? AFAICS there's enough space for a
> > > 2-word spinlock in struct page for pagetables.
> >
> > Yes. There is no real problem. But my patch offends good taste.
>
> Isn't it going to overrun page.lru with CONFIG_DEBUG_SPINLOCK?
No. There is just one case where it would,
so in that case split ptlock is disabled by mm/Kconfig's
# PA-RISC 7xxx's debug spinlock_t is too large for 32-bit struct page.
default "4096" if PARISC && DEBUG_SPINLOCK && !PA20
Of course, someone may extend spinlock debugging info tomorrow; but
when they do, presumably they'll try it out, and hit the BUILD_BUG_ON.
They'll then probably want to extend the suppression in mm/Kconfig.
Hugh
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