[IA64] need r29=psr *after* rsm psr.i

Yanmin Zhang pointed out a sequence problem when saving the psr.  David
Mosberger provided this patch (which gave up a cycle).

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/ia64/kernel/gate.S b/arch/ia64/kernel/gate.S
index 272e64c0e21b..86948ce63e43 100644
--- a/arch/ia64/kernel/gate.S
+++ b/arch/ia64/kernel/gate.S
@@ -77,7 +77,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
         epc                                     // B    causes split-issue
 }
         ;;
-        rsm psr.be                              // M2 (5 cyc to srlz.d)
+        rsm psr.be | psr.i                      // M2 (5 cyc to srlz.d)
         LOAD_FSYSCALL_TABLE(r14)                // X
         ;;
         mov r16=IA64_KR(CURRENT)                // M2 (12 cyc)
@@ -98,15 +98,14 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
         nop.i 0
         ;;
         nop.m 0
-(p6)    mov b7=r18                              // I0
 (p6)    tbit.z.unc p8,p0=r18,0                  // I0 (dual-issues with "mov b7=r18"!)
-
-        nop.m 0
         nop.i 0
+        ;;
+(p8)    ssm psr.i
+(p6)    mov b7=r18                              // I0
 (p8)    br.dptk.many b7                         // B
 
         mov r27=ar.rsc                          // M2 (12 cyc)
-(p6)    rsm psr.i                               // M2
 /*
  * brl.cond doesn't work as intended because the linker would convert this branch
  * into a branch to a PLT.  Perhaps there will be a way to avoid this with some
@@ -123,7 +122,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
 #else
         BRL_COND_FSYS_BUBBLE_DOWN(p6)
 #endif
-
+        ssm psr.i
         mov r10=-1
 (p10)   mov r8=EINVAL
 (p9)    mov r8=ENOSYS