Date: Fri, 13 Dec 2013 06:28:18 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r259299 - stable/10/sys/vm Message-ID: <201312130628.rBD6SIh7087642@svn.freebsd.org>
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Author: kib Date: Fri Dec 13 06:28:18 2013 New Revision: 259299 URL: http://svnweb.freebsd.org/changeset/base/259299 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/10/sys/vm/vm_map.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/vm/vm_map.c ============================================================================== --- stable/10/sys/vm/vm_map.c Fri Dec 13 06:25:43 2013 (r259298) +++ stable/10/sys/vm/vm_map.c Fri Dec 13 06:28:18 2013 (r259299) @@ -1876,6 +1876,9 @@ 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); @@ -2030,12 +2033,16 @@ 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: @@ -2190,6 +2197,8 @@ 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)) { @@ -2222,6 +2231,8 @@ 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); @@ -2392,6 +2403,8 @@ 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; @@ -2833,6 +2846,8 @@ 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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