Author: kib
Date: Fri Dec 13 06:29:02 2013
New Revision: 259300
URL: http://svnweb.freebsd.org/changeset/base/259300
Log:
MFC r258367:
Verify for zero-length requests and act as if it is always successfull
without performing any action on the address space.
Modified:
stable/9/sys/vm/vm_map.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/vm/vm_map.c
==============================================================================
--- stable/9/sys/vm/vm_map.c Fri Dec 13 06:28:18 2013 (r259299)
+++ stable/9/sys/vm/vm_map.c Fri Dec 13 06:29:02 2013 (r259300)
@@ -1894,6 +1894,9 @@ vm_map_protect(vm_map_t map, vm_offset_t
struct ucred *cred;
vm_prot_t old_prot;
+ if (start == end)
+ return (KERN_SUCCESS);
+
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
@@ -2048,12 +2051,16 @@ vm_map_madvise(
case MADV_AUTOSYNC:
case MADV_NOCORE:
case MADV_CORE:
+ if (start == end)
+ return (KERN_SUCCESS);
modify_map = 1;
vm_map_lock(map);
break;
case MADV_WILLNEED:
case MADV_DONTNEED:
case MADV_FREE:
+ if (start == end)
+ return (KERN_SUCCESS);
vm_map_lock_read(map);
break;
default:
@@ -2191,6 +2198,8 @@ vm_map_inherit(vm_map_t map, vm_offset_t
default:
return (KERN_INVALID_ARGUMENT);
}
+ if (start == end)
+ return (KERN_SUCCESS);
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
if (vm_map_lookup_entry(map, start, &temp_entry)) {
@@ -2223,6 +2232,8 @@ vm_map_unwire(vm_map_t map, vm_offset_t
int rv;
boolean_t need_wakeup, result, user_unwire;
+ if (start == end)
+ return (KERN_SUCCESS);
user_unwire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
@@ -2393,6 +2404,8 @@ vm_map_wire(vm_map_t map, vm_offset_t st
boolean_t fictitious, need_wakeup, result, user_wire;
vm_prot_t prot;
+ if (start == end)
+ return (KERN_SUCCESS);
prot = 0;
if (flags & VM_MAP_WIRE_WRITE)
prot |= VM_PROT_WRITE;
@@ -2835,6 +2848,8 @@ vm_map_delete(vm_map_t map, vm_offset_t
vm_map_entry_t first_entry;
VM_MAP_ASSERT_LOCKED(map);
+ if (start == end)
+ return (KERN_SUCCESS);
/*
* Find the start of the region, and clip it
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