[XenPPC] [PATCH] Memory barrier after sp store

[Amos Waterland <apw@xxxxxxxxxx>]

Ensure that the store to pa.hype_stack_base will be seen before the
store of pa to global_cpu_table[cpuid].

I have been unable to demonstrate this causing a problem in practice
despite many attempts, but I think it should go in by inspection anyway.

Signed-off-by: Amos Waterland <apw@xxxxxxxxxx>

---

 setup.c |    1 +
 1 file changed, 1 insertion(+)

diff -r 9148f7816d00 xen/arch/powerpc/setup.c
--- a/xen/arch/powerpc/setup.c  Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/arch/powerpc/setup.c  Thu Nov 02 12:29:58 2006 -0500
@@ -234,6 +234,7 @@ static void init_parea(int cpuid)
     pa->whoami = cpuid;
     pa->hard_id = cpu_hard_id[cpuid];
     pa->hyp_stack_base = (void *)((ulong)stack + STACK_SIZE);
+    mb();
 
     /* This store has the effect of invoking secondary_cpu_init.  */
     global_cpu_table[cpuid] = pa;

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