[Xen-changelog] performance fix backported from unstable

[Xen patchbot -2.0-testing <patchbot-2.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User vh249@xxxxxxxxxxxxxxxxxxxxxx
# Node ID 35801a414624343b727b87469e4cc6903c6b0db7
# Parent  7fa00b26a99532139fc872756ee5a977abb3db63
performance fix backported from unstable

Signed-off-by: Vincent Hanquez <vincent@xxxxxxxxxxxxx>

diff -r 7fa00b26a995 -r 35801a414624 
linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h    Fri Aug 
12 13:48:47 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h    Mon Aug 
15 12:13:41 2005
@@ -16,7 +16,17 @@
 #define set_pte_batched(pteptr, pteval) \
        queue_l1_entry_update(pteptr, (pteval).pte_low)
 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+inline static void set_pte_at(struct mm_struct *mm, unsigned long addr, 
+                      pte_t *ptep, pte_t val )
+{
+    if ( ((mm != current->mm) && (mm != &init_mm)) ||
+        HYPERVISOR_update_va_mapping( (addr), (val), 0 ) )
+    {
+        set_pte(ptep, val);
+    }
+}
+
 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
 #define set_pmd(pmdptr, pmdval) xen_l2_entry_update((pmdptr), (pmdval))
 

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