Date: Wed, 14 Nov 2001 21:41:37 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "David Xu" <davidx@viasoft.com.cn> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: vm_map_protect() Message-ID: <200111150541.fAF5fbs18850@apollo.backplane.com> References: <005a01c16d74$9e0c88a0$ef01a8c0@davidwnt>
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:In FreeBSD 4.4-stable file /sys/vm/vm_map.c, function vm_map_protect()
:will leave and have an entry splitted when first pass fails.
:here is the patch to avoid such issue.
Hmm... don't you want to vm_map_simplify_entry() at the end instead
of vm_map_clip_start()?
-Matt
Matthew Dillon
<dillon@backplane.com>
:%diff -u vm_map.c.orig vm_map.c
:--- vm_map.c.orig Thu Nov 15 08:27:19 2001
:+++ vm_map.c Thu Nov 15 09:08:47 2001
:@@ -999,13 +999,14 @@
: {
: vm_map_entry_t current;
: vm_map_entry_t entry;
:+ int clip_start = 0;
:
: vm_map_lock(map);
:
: VM_MAP_RANGE_CHECK(map, start, end);
:
: if (vm_map_lookup_entry(map, start, &entry)) {
:- vm_map_clip_start(map, entry, start);
:+ clip_start = 1;
: } else {
: entry = entry->next;
: }
:@@ -1026,6 +1027,8 @@
: }
: current = current->next;
: }
:+ if (clip_start)
:+ vm_map_clip_start(map, entry, start);
:
: /*
: * Go back and fix up protections. [Note that clipping is not
:
:--
:David Xu
:
:
:
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