panic: pmap_page_protect: illegal for unmanaged page

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

I think I found a bug somewhere in the code chain of msync(..., MS_INVALIDATE), if refering to mmap()ed device memory.

device memory has pages of type PG_FICTITIOUS, but pmap_remove_all() complains:

#if defined(PMAP_DIAGNOSTIC)
       /*      
        * XXX this makes pmap_page_protect(NONE) illegal for non-managed
        * pages!
        */
       if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) {
               panic("pmap_page_protect: illegal for unmanaged page, va: 0x%08llx", (long long)VM_PAGE_TO_PHYS(m));
       }
#endif

I guess the XXX is correct and we need to either a) avoid calling pmap_remove_all() or b) return without error.

cheers
 simon

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