# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Node ID 3725cf3af404ae7deed8e0bb8e557031b56721d0
# Parent  a9d85d3c5fab4a2a3005cd7293b16d334ddbc06a
instroduce gnttab_empty_grant_references() to check whether grant
references is empty.
PATCHNAME: gnttab_empty_grant_references

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r a9d85d3c5fab -r 3725cf3af404 linux-2.6-xen-sparse/drivers/xen/core/gnttab.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c	Fri Apr 14 15:04:27 2006 +0900
+++ b/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c	Fri Apr 14 15:04:36 2006 +0900
@@ -65,6 +65,7 @@ EXPORT_SYMBOL_GPL(gnttab_alloc_grant_ref
 EXPORT_SYMBOL_GPL(gnttab_alloc_grant_references);
 EXPORT_SYMBOL_GPL(gnttab_free_grant_references);
 EXPORT_SYMBOL_GPL(gnttab_free_grant_reference);
+EXPORT_SYMBOL_GPL(gnttab_empty_grant_references);
 EXPORT_SYMBOL_GPL(gnttab_claim_grant_reference);
 EXPORT_SYMBOL_GPL(gnttab_release_grant_reference);
 EXPORT_SYMBOL_GPL(gnttab_request_free_callback);
@@ -322,6 +323,12 @@ gnttab_alloc_grant_references(u16 count,
 	*head = h;
 
 	return 0;
+}
+
+int
+gnttab_empty_grant_references(const grant_ref_t *private_head)
+{
+	return (*private_head == GNTTAB_LIST_END);
 }
 
 int
diff -r a9d85d3c5fab -r 3725cf3af404 linux-2.6-xen-sparse/include/xen/gnttab.h
--- a/linux-2.6-xen-sparse/include/xen/gnttab.h	Fri Apr 14 15:04:27 2006 +0900
+++ b/linux-2.6-xen-sparse/include/xen/gnttab.h	Fri Apr 14 15:04:36 2006 +0900
@@ -91,6 +91,8 @@ void gnttab_free_grant_reference(grant_r
 
 void gnttab_free_grant_references(grant_ref_t head);
 
+int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
+
 int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
 
 void gnttab_release_grant_reference(grant_ref_t *private_head,