On 20/12/12 17:09, H Hartley Sweeten wrote:
Hello all, I have a question... In the comedi core, the asynchronous 'prealloc_buf' is vmap'ed after the page list has been allocated. The code in question looks like this: async->prealloc_buf = #ifdef PAGE_KERNEL_NOCACHE vmap(pages, n_pages, VM_MAP, PAGE_KERNEL_NOCACHE); #else vmap(pages, n_pages, VM_MAP, PAGE_KERNEL); #endif Is the #ifdef something left over from an older kernel? Isn't PAGE_KERNEL_NOCACHE always defined?
Unfortunately not; it's arch dependent. Neither ARM nor PowerPC define it, for example.
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