[Xen-changelog] Do_softirq is invoked at the path of ia64_leave_kernel instead of

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID a0e7daa2df33b0b60a5de113e5b4f8eb731866eb
# Parent  4ee359893af453aaaf4fd2e49fef3f134cc54c74
Do_softirq is invoked at the path of ia64_leave_kernel instead of
being invoking in function irq_exit, which is aligned with XEN/X86 and
avoids __enter_schedule being reentered.

Signed-off-by Anthony Xu <anthony.xu@xxxxxxxxx>

diff -r 4ee359893af4 -r a0e7daa2df33 xen/arch/ia64/linux-xen/entry.S
--- a/xen/arch/ia64/linux-xen/entry.S   Thu Feb  9 15:03:17 2006
+++ b/xen/arch/ia64/linux-xen/entry.S   Thu Feb  9 15:09:00 2006
@@ -895,6 +895,10 @@
 #endif
 .work_processed_kernel:
 #ifdef XEN
+(pUStk) ssm psr.i
+(pUStk)    br.call.sptk.many b0=process_soft_irq
+(pUStk) rsm psr.i
+    ;;
        alloc loc0=ar.pfs,0,1,1,0
        adds out0=16,r12
     adds r7 = PT(EML_UNAT)+16,r12
@@ -907,7 +911,7 @@
 (p8) br.sptk.few leave_kernel_self
        ;; 
 #endif
-(p6)   br.call.sptk.many b0=deliver_pending_interrupt
+(pUStk)        br.call.sptk.many b0=deliver_pending_interrupt
     ;;
        mov ar.pfs=loc0
        mov ar.unat=r7  /* load eml_unat  */
diff -r 4ee359893af4 -r a0e7daa2df33 xen/arch/ia64/xen/xenirq.c
--- a/xen/arch/ia64/xen/xenirq.c        Thu Feb  9 15:03:17 2006
+++ b/xen/arch/ia64/xen/xenirq.c        Thu Feb  9 15:09:00 2006
@@ -61,16 +61,20 @@
  */
 void xen_irq_exit(struct pt_regs *regs)
 {
-       //account_system_vtime(current);
        sub_preempt_count(IRQ_EXIT_OFFSET);
-    if((((char *)regs) -(char *) current) != 
(IA64_STK_OFFSET-IA64_PT_REGS_SIZE))
-        return;
+}
 
-       if (!in_interrupt()&&local_softirq_pending()) {
+/*
+ * ONLY gets called from ia64_leave_kernel
+ * ONLY call with interrupts enabled
+ */
+void process_soft_irq()
+{
+       if (!in_interrupt() && local_softirq_pending()) {
                add_preempt_count(SOFTIRQ_OFFSET);
                do_softirq();
                sub_preempt_count(SOFTIRQ_OFFSET);
        }
-       //preempt_enable_no_resched();
 }
+
 /* end from linux/kernel/softirq.c */

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