Andrew Morton <[email protected]> wrote:
>
> Hugh Dickins <[email protected]> wrote:
> >
> > In this implementation, the spinlock is tucked inside the struct page of
> > the page table page: with a BUILD_BUG_ON in case it overflows - which it
> > would in the case of 32-bit PA-RISC with spinlock debugging enabled.
>
> eh? It's going to overflow an unsigned long on x86 too:
Ah, I think I see what you've done: assume that .index, .lru and .virtual
are unused on pagetable pages, so we can just overwrite them.
ick. I think I prefer the union, although it'll make struct page bigger
for CONFIG_PREEMPT+CONFIG_SMP+NR_CPUS>=4. hmm.
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