xen/23091-xentrace_fix_t_info_pages_calculation..patch

changeset:   23091:67632e5cf652
user:        Olaf Hering <olaf@aepfle.de>
date:        Fri Mar 25 08:56:33 2011 +0000
files:       xen/common/trace.c
description:
xentrace: fix t_info_pages calculation.

Signed-off-by: Olaf Hering <olaf@aepfle.de>


---
 xen/common/trace.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Index: xen-4.1.2-testing/xen/common/trace.c
===================================================================
--- xen-4.1.2-testing.orig/xen/common/trace.c
+++ xen-4.1.2-testing/xen/common/trace.c
@@ -29,6 +29,7 @@
 #include <xen/init.h>
 #include <xen/mm.h>
 #include <xen/percpu.h>
+#include <xen/pfn.h>
 #include <xen/cpu.h>
 #include <asm/atomic.h>
 #include <public/sysctl.h>
@@ -109,6 +110,7 @@ static int calculate_tbuf_size(unsigned
 {
     struct t_buf dummy;
     typeof(dummy.prod) size;
+    unsigned int t_info_words, t_info_bytes;
 
     /* force maximum value for an unsigned type */
     size = -1;
@@ -122,11 +124,9 @@ static int calculate_tbuf_size(unsigned
         pages = size;
     }
 
-    t_info_pages = num_online_cpus() * pages + t_info_first_offset;
-    t_info_pages *= sizeof(uint32_t);
-    t_info_pages /= PAGE_SIZE;
-    if ( t_info_pages % PAGE_SIZE )
-        t_info_pages++;
+    t_info_words = num_online_cpus() * pages + t_info_first_offset;
+    t_info_bytes = t_info_words * sizeof(uint32_t);
+    t_info_pages = PFN_UP(t_info_bytes);
     return pages;
 }