1 files changed, 23 insertions, 0 deletions

diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 3c8821024509..915e12791836 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -470,6 +470,29 @@ ENTRY(load_switch_stack)
         br.cond.sptk.many b7
 END(load_switch_stack)
 
+GLOBAL_ENTRY(prefetch_stack)
+        add r14 = -IA64_SWITCH_STACK_SIZE, sp
+        add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0
+        ;;
+        ld8 r16 = [r15]                         // load next's stack pointer
+        lfetch.fault.excl [r14], 128
+        ;;
+        lfetch.fault.excl [r14], 128
+        lfetch.fault [r16], 128
+        ;;
+        lfetch.fault.excl [r14], 128
+        lfetch.fault [r16], 128
+        ;;
+        lfetch.fault.excl [r14], 128
+        lfetch.fault [r16], 128
+        ;;
+        lfetch.fault.excl [r14], 128
+        lfetch.fault [r16], 128
+        ;;
+        lfetch.fault [r16], 128
+        br.ret.sptk.many rp
+END(prefetch_switch_stack)
+
 GLOBAL_ENTRY(execve)
         mov r15=__NR_execve                     // put syscall number in place
         break __BREAK_SYSCALL