Tidy up the early parts of vm_map_insert(), in particular, simplify one
of the assertions and eliminate a comment that has grown stale. Reviewed by: kib MFC after: 1 week
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0413bfcac9
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33314db034
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=267546
@ -1112,18 +1112,20 @@ vm_map_lookup_entry(
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*/
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int
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vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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vm_offset_t start, vm_offset_t end, vm_prot_t prot, vm_prot_t max,
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int cow)
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vm_offset_t start, vm_offset_t end, vm_prot_t prot, vm_prot_t max, int cow)
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{
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vm_map_entry_t new_entry;
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vm_map_entry_t prev_entry;
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vm_map_entry_t temp_entry;
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vm_map_entry_t new_entry, prev_entry, temp_entry;
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vm_eflags_t protoeflags;
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struct ucred *cred;
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vm_inherit_t inheritance;
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boolean_t charge_prev_obj;
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VM_MAP_ASSERT_LOCKED(map);
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KASSERT((object != kmem_object && object != kernel_object) ||
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(cow & MAP_COPY_ON_WRITE) == 0,
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("vm_map_insert: kmem or kernel object and COW"));
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KASSERT(object == NULL || (cow & MAP_NOFAULT) == 0,
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("vm_map_insert: paradoxical MAP_NOFAULT request"));
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/*
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* Check that the start and end points are not bogus.
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@ -1149,17 +1151,10 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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return (KERN_NO_SPACE);
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protoeflags = 0;
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charge_prev_obj = FALSE;
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if (cow & MAP_COPY_ON_WRITE)
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protoeflags |= MAP_ENTRY_COW|MAP_ENTRY_NEEDS_COPY;
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if (cow & MAP_NOFAULT) {
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protoeflags |= MAP_ENTRY_COW | MAP_ENTRY_NEEDS_COPY;
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if (cow & MAP_NOFAULT)
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protoeflags |= MAP_ENTRY_NOFAULT;
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KASSERT(object == NULL,
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("vm_map_insert: paradoxical MAP_NOFAULT request"));
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}
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if (cow & MAP_DISABLE_SYNCER)
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protoeflags |= MAP_ENTRY_NOSYNC;
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if (cow & MAP_DISABLE_COREDUMP)
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@ -1172,10 +1167,7 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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inheritance = VM_INHERIT_DEFAULT;
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cred = NULL;
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KASSERT((object != kmem_object && object != kernel_object) ||
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((object == kmem_object || object == kernel_object) &&
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!(protoeflags & MAP_ENTRY_NEEDS_COPY)),
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("kmem or kernel object and cow"));
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charge_prev_obj = FALSE;
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if (cow & (MAP_ACC_NO_CHARGE | MAP_NOFAULT))
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goto charged;
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if ((cow & MAP_ACC_CHARGED) || ((prot & VM_PROT_WRITE) &&
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@ -1255,12 +1247,6 @@ vm_map_insert(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
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}
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}
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/*
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* NOTE: if conditionals fail, object can be NULL here. This occurs
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* in things like the buffer map where we manage kva but do not manage
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* backing objects.
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*/
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/*
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* Create a new entry
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*/
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