x86/boot: Remove stack segment parameter from smpboot

The stack segment is legacy remnant of a 32bit hypervisor, and not used in
64bit.  Furthermore, the unsigned short in the structure actually aliases
whatever the linker decides to put next in the data section.

Drop the extern struct definition and change it to a simple void pointer,
which matches its definition in arch/x86/boot/x86_64.S

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 3df4e882a90dccbb2ff2d6f927f09d78100bc587..9f81c7ba62ca7e2e77062ab4f0c5dfd2b6a3a6fe 100644 (file)
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -393,10 +393,7 @@ void start_secondary(void *unused)
     startup_cpu_idle_loop();
 }
 
-extern struct {
-    void * esp;
-    unsigned short ss;
-} stack_start;
+extern void *stack_start;
 
 static int wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
 {
@@ -555,7 +552,7 @@ static int do_boot_cpu(int apicid, int cpu)
         printk("Booting processor %d/%d eip %lx\n",
                cpu, apicid, start_eip);
 
-    stack_start.esp = stack_base[cpu];
+    stack_start = stack_base[cpu];
 
     /* This grunge runs the startup process for the targeted processor. */
 
@@ -734,7 +731,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
     boot_cpu_physical_apicid = get_apic_id();
     x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
 
-    stack_base[0] = stack_start.esp;
+    stack_base[0] = stack_start;
 
     if ( !zalloc_cpumask_var(&per_cpu(cpu_sibling_mask, 0)) ||
          !zalloc_cpumask_var(&per_cpu(cpu_core_mask, 0)) )