[PATCH] ppc64: enforce medium thread priority in hypervisor calls

Calls into the hypervisor do not raise the thread priority.  Ensure we are
running at medium priority upon entry to the hypervisor.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/pSeries_hvCall.S b/arch/ppc64/kernel/pSeries_hvCall.S
index 0715d3038019..176e8da76466 100644
--- a/arch/ppc64/kernel/pSeries_hvCall.S
+++ b/arch/ppc64/kernel/pSeries_hvCall.S
@@ -28,6 +28,8 @@
                         unsigned long *out3);           R10
  */
 _GLOBAL(plpar_hcall)
+        HMT_MEDIUM
+
         mfcr    r0
 
         std     r8,STK_PARM(r8)(r1)     /* Save out ptrs */
@@ -53,6 +55,8 @@ _GLOBAL(plpar_hcall)
 
 /* Simple interface with no output values (other than status) */
 _GLOBAL(plpar_hcall_norets)
+        HMT_MEDIUM
+
         mfcr    r0
         stw     r0,8(r1)
 
@@ -75,6 +79,8 @@ _GLOBAL(plpar_hcall_norets)
                         unsigned long *out1);           120(R1)
  */
 _GLOBAL(plpar_hcall_8arg_2ret)
+        HMT_MEDIUM
+
         mfcr    r0
         ld      r11,STK_PARM(r11)(r1)   /* put arg8 in R11 */
         stw     r0,8(r1)
@@ -99,6 +105,8 @@ _GLOBAL(plpar_hcall_8arg_2ret)
                         unsigned long *out4);           112(R1)
  */
 _GLOBAL(plpar_hcall_4out)
+        HMT_MEDIUM
+
         mfcr    r0
         stw     r0,8(r1)