[Xen-changelog] [xen-unstable] Allow all trace-buffer hypercalls to be executed even when tracing is currently disabled.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 8c6ff337d164f240513337c1f4ae8332da255176
# Parent  7f219d68e6849b873fbd76e9a30b5ba297acbcea
Allow all trace-buffer hypercalls to be executed even when tracing is currently 
disabled.
From: George Dunlap
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 xen/common/trace.c |   10 +---------
 1 files changed, 1 insertion(+), 9 deletions(-)

diff -r 7f219d68e684 -r 8c6ff337d164 xen/common/trace.c
--- a/xen/common/trace.c        Thu Jun 01 19:14:42 2006 +0100
+++ b/xen/common/trace.c        Thu Jun 01 21:34:47 2006 +0100
@@ -178,20 +178,12 @@ int tb_control(dom0_tbufcontrol_t *tbc)
 
     spin_lock(&lock);
 
-    if ( !tb_init_done &&
-         (tbc->op != DOM0_TBUF_SET_SIZE) &&
-         (tbc->op != DOM0_TBUF_ENABLE) )
-    {
-        spin_unlock(&lock);
-        return -EINVAL;
-    }
-
     switch ( tbc->op )
     {
     case DOM0_TBUF_GET_INFO:
         tbc->cpu_mask   = tb_cpu_mask;
         tbc->evt_mask   = tb_event_mask;
-        tbc->buffer_mfn = __pa(t_bufs[0]) >> PAGE_SHIFT;
+        tbc->buffer_mfn = opt_tbuf_size ? virt_to_mfn(t_bufs[0]) : 0UL;
         tbc->size       = opt_tbuf_size * PAGE_SIZE;
         break;
     case DOM0_TBUF_SET_CPU_MASK:

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