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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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