[Xen-devel] [PATCH] Small fix for shadow_remove_all_access_in_page

[Michael Vrable <mvrable@xxxxxxxxxxx>]

Here's a fairly simple patch to correct a bug I hit when experimenting
with VM forking earlier.  Let me know if there's anything wrong with the
changeset; this is the first time I've tried exporting a changeset from
Mercurial.

--Michael Vrable


# HG changeset patch
# User Michael Vrable <mvrable@xxxxxxxxxxx>
# Node ID df9609e384a4a819a69d01556b8231b842b04050
# Parent  d8637529dafff3c610e4bb31349d4ae00a23a18e
Fix a bug in shadow_remove_all_access_in_page.

Fixes a fairly obvious bug, in which an if statement was reversed.  The
bug has been present for a while, so apparently this code isn't well
tested.

Signed-off-by: Michael Vrable <mvrable@xxxxxxxxxxx>

diff -r d8637529daff -r df9609e384a4 xen/arch/x86/shadow32.c
--- a/xen/arch/x86/shadow32.c   Mon Sep 12 21:42:26 2005
+++ b/xen/arch/x86/shadow32.c   Tue Sep 13 02:00:19 2005
@@ -2226,7 +2226,7 @@
     
     for (i = 0; i < L1_PAGETABLE_ENTRIES; i++)
     {
-        if ( unlikely(!l1e_has_changed(pl1e[i], match, flags) == 0) )
+        if ( unlikely(!l1e_has_changed(pl1e[i], match, flags)) )
         {
             l1_pgentry_t ol2e = pl1e[i];
             pl1e[i] = l1e_empty();
diff -r d8637529daff -r df9609e384a4 xen/arch/x86/shadow_public.c
--- a/xen/arch/x86/shadow_public.c      Mon Sep 12 21:42:26 2005
+++ b/xen/arch/x86/shadow_public.c      Tue Sep 13 02:00:19 2005
@@ -1634,7 +1634,7 @@
 
     for (i = 0; i < L1_PAGETABLE_ENTRIES; i++)
     {
-        if ( unlikely(!l1e_has_changed(pl1e[i], match, flags) == 0) )
+        if ( unlikely(!l1e_has_changed(pl1e[i], match, flags)) )
         {
             l1_pgentry_t ol2e = pl1e[i];
             pl1e[i] = l1e_empty();

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