[IA64] Don't alloc empty frame in ia64_switch_mode_phys

I think ia64_switch_mode_phys and ia64_switch_mode_virt
does not need to alloc an empty frame.
An empty frame is required by loadrs but flushrs
does not need that.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index 561b8f1d3bc7dbb62c05f41494f856b199afe2ab..29236f0c62b5ea20f9597c1e159175c884ef32e2 100644 (file)
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -853,7 +853,6 @@ END(__ia64_init_fpu)
  */
 GLOBAL_ENTRY(ia64_switch_mode_phys)
  {
-       alloc r2=ar.pfs,0,0,0,0
        rsm psr.i | psr.ic              // disable interrupts and interrupt collection
        mov r15=ip
  }
@@ -902,7 +901,6 @@ END(ia64_switch_mode_phys)
  */
 GLOBAL_ENTRY(ia64_switch_mode_virt)
  {
-       alloc r2=ar.pfs,0,0,0,0
        rsm psr.i | psr.ic              // disable interrupts and interrupt collection
        mov r15=ip
  }