8b45dda2bc
The big fix here is the removal of kmalloc() in kv_alloc(). It used to be true in previous kernels that kmallocs over PAGE_SIZE would always be pages aligned. This is no longer true atleast in 2.6.31 there are no longer any alignment expectations. Since kv_alloc() requires the resulting address to be page align we no only either directly allocate pages in the KMC_KMEM case, or directly call __vmalloc() both of which will always return a page aligned address. Additionally, to avoid wasting memory size is always a power of two. As for cleanup several helper functions were introduced to calculate the aligned sizes of various data structures. This helps ensure no case is accidentally missed where the alignment needs to be taken in to account. The helpers now use P2ROUNDUP_TYPE instead of P2ROUNDUP which is safer since the type will be explict and we no longer count on the compiler to auto promote types hopefully as we expected. Always wnforce minimum (SPL_KMEM_CACHE_ALIGN) and maximum (PAGE_SIZE) alignment restrictions at cache creation time. Use SPL_KMEM_CACHE_ALIGN in splat alignment test. |
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