Messages in this thread | | | Date | Sun, 23 Oct 2005 15:22:45 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 7/9] mm: split page table lock |
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Andrew Morton <akpm@osdl.org> wrote: > > Hugh Dickins <hugh@veritas.com> 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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