Quoting Mika Kuoppala (2019-06-11 18:27:24)
> struct i915_page_table {
> struct i915_page_dma base;
> - atomic_t used_ptes;
> + atomic_t used;
> };
>
> struct i915_page_directory {
> struct i915_page_dma base;
> -
> - struct i915_page_table *page_table[I915_PDES]; /* PDEs */
> - atomic_t used_pdes;
> - spinlock_t lock;
> -};
> -
> -struct i915_page_directory_pointer {
> - struct i915_page_dma base;
> - struct i915_page_directory **page_directory;
> - atomic_t used_pdpes;
> - spinlock_t lock;
> -};
> -
> -struct i915_pml4 {
> - struct i915_page_dma base;
> - struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
> + atomic_t used;
> spinlock_t lock;
> + void *entry[0];
> };
And always (albeit with a single bsw discrepancy) 512. At the very least
you can alias a fixed sized variant over the top to remove the extra
pointer chasing you added.
-Chris
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