On 12.05.2013 20:50, Alan Cox wrote:
GNU cc errors related to part of diff below:
cc1: warnings being treated as errors
../../../vm/vm_page.c: In function 'vm_page_alloc':
../../../vm/vm_page.c:1209: warning: 'mpred' may be used uninitialized
in this function
*** [vm_page.o] Error code 1
Formally yes, mpred here can be left unitialized.
> @@ -1179,7 +1206,7 @@ vm_page_alloc(vm_object_t object, vm_pin
> {
> struct vnode *vp = NULL;
> vm_object_t m_object;
> - vm_page_t m;
> + vm_page_t m, mpred;
> int flags, req_class;
>
> KASSERT((object != NULL) == ((req & VM_ALLOC_NOOBJ) == 0),
> @@ -1195,6 +1222,11 @@ vm_page_alloc(vm_object_t object, vm_pin
> if (curproc == pageproc && req_class != VM_ALLOC_INTERRUPT)
> req_class = VM_ALLOC_SYSTEM;
>
> + if (object != NULL) {
> + mpred = vm_radix_lookup_le(&object->rtree, pindex);
> + KASSERT(mpred == NULL || mpred->pindex != pindex,
> + ("vm_page_alloc: pindex already allocated"));
> + }
> mtx_lock(&vm_page_queue_free_mtx);
> if (cnt.v_free_count + cnt.v_cache_count > cnt.v_free_reserved ||
> (req_class == VM_ALLOC_SYSTEM &&
> @@ -1225,8 +1257,8 @@ vm_page_alloc(vm_object_t object, vm_pin
> return (NULL);
> #if VM_NRESERVLEVEL > 0
> } else if (object == NULL || (object->flags & (OBJ_COLORED |
> - OBJ_FICTITIOUS)) != OBJ_COLORED ||
> - (m = vm_reserv_alloc_page(object, pindex)) == NULL) {
> + OBJ_FICTITIOUS)) != OBJ_COLORED || (m =
> + vm_reserv_alloc_page(object, pindex, mpred)) == NULL) {
> #else
> } else {
> #endif
> @@ -1320,7 +1352,7 @@ vm_page_alloc(vm_object_t object, vm_pin
> if (object->memattr != VM_MEMATTR_DEFAULT &&
> (object->flags & OBJ_FICTITIOUS) == 0)
> pmap_page_set_memattr(m, object->memattr);
> - vm_page_insert(m, object, pindex);
> + vm_page_insert_after(m, object, pindex, mpred);
> } else
> m->pindex = pindex;
--
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