xenconsole: Define and use a macro INVALID_XEN_PFN instead of -1

[Bhupinder Thakur <bhupinder.thakur@linaro.org>]

xenconsole will use a new macro INVALID_XEN_PFN instead of -1 for initializing ring-ref.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
---
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
CC: George Dunlap <George.Dunlap@eu.citrix.com>
CC: Jan Beulich <jbeulich@suse.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>

 tools/console/daemon/io.c | 10 +++++-----
 xen/include/public/xen.h  |  2 ++
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 1839973..9129f5a 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -658,12 +658,12 @@ static void console_unmap_interface(struct console *con)
 {
 	if (con->interface == NULL)
 		return;
-	if (xgt_handle && con->ring_ref == -1)
+	if (xgt_handle && con->ring_ref == INVALID_XEN_PFN)
 		xengnttab_unmap(xgt_handle, con->interface, 1);
 	else
 		munmap(con->interface, XC_PAGE_SIZE);
 	con->interface = NULL;
-	con->ring_ref = -1;
+	con->ring_ref = INVALID_XEN_PFN;
 }
  
 static int console_create_ring(struct console *con)
@@ -698,7 +698,7 @@ static int console_create_ring(struct console *con)
 	free(type);
 
 	/* If using ring_ref and it has changed, remap */
-	if (ring_ref != con->ring_ref && con->ring_ref != -1)
+	if (ring_ref != con->ring_ref && con->ring_ref != INVALID_XEN_PFN)
 		console_unmap_interface(con);
 
 	if (!con->interface && xgt_handle && con->use_gnttab) {
@@ -706,7 +706,7 @@ static int console_create_ring(struct console *con)
 		con->interface = xengnttab_map_grant_ref(xgt_handle,
 			dom->domid, GNTTAB_RESERVED_CONSOLE,
 			PROT_READ|PROT_WRITE);
-		con->ring_ref = -1;
+		con->ring_ref = INVALID_XEN_PFN;
 	}
 	if (!con->interface) {
 		/* Fall back to xc_map_foreign_range */
@@ -812,7 +812,7 @@ static int console_init(struct console *con, struct domain *dom, void **data)
 	con->master_pollfd_idx = -1;
 	con->slave_fd = -1;
 	con->log_fd = -1;
-	con->ring_ref = -1;
+	con->ring_ref = INVALID_XEN_PFN;
 	con->local_port = -1;
 	con->remote_port = -1;
 	con->xce_pollfd_idx = -1;
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 308109f..fc383ca 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -37,6 +37,8 @@
 #error "Unsupported architecture"
 #endif
 
+#define INVALID_XEN_PFN (~(xen_pfn_t)0)
+
 #ifndef __ASSEMBLY__
 /* Guest handles for primitive C types. */
 DEFINE_XEN_GUEST_HANDLE(char);
-- 
2.7.4


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