Instead of copying current_set[cpu] to secondary_ti, directly index into
current_set by the cpu number like head_64.S. In addition to removing
the variable, a slow to respond cpu will not clobber another cpus
stack.
---
grep found no other reference in arch/powerpc. compile tested but I have
no 32bit smp hardware.
Index: next.git/arch/powerpc/kernel/head_32.S
===================================================================
--- next.git.orig/arch/powerpc/kernel/head_32.S 2008-11-16 01:36:45.000000000
-0600
+++ next.git/arch/powerpc/kernel/head_32.S 2008-11-16 01:42:02.000000000
-0600
@@ -906,10 +906,11 @@ __secondary_start:
bl init_idle_6xx
#endif /* CONFIG_6xx */
- /* get current_thread_info and current */
- lis r1,[EMAIL PROTECTED]
+ /* get current_thread_info (current_set[cpu]) and current = */
+ slwi r1,r24,2
+ addis r1,r1,[EMAIL PROTECTED]
tophys(r1,r1)
- lwz r1,[EMAIL PROTECTED](r1)
+ lwz r1,[EMAIL PROTECTED](r1)
tophys(r2,r1)
lwz r2,TI_TASK(r2)
Index: next.git/arch/powerpc/kernel/smp.c
===================================================================
--- next.git.orig/arch/powerpc/kernel/smp.c 2008-11-16 01:36:05.000000000
-0600
+++ next.git/arch/powerpc/kernel/smp.c 2008-11-16 01:36:22.000000000 -0600
@@ -58,7 +58,6 @@
#endif
int smp_hw_index[NR_CPUS];
-struct thread_info *secondary_ti;
cpumask_t cpu_possible_map = CPU_MASK_NONE;
cpumask_t cpu_online_map = CPU_MASK_NONE;
@@ -320,7 +319,6 @@ int __cpuinit __cpu_up(unsigned int cpu)
{
int c;
- secondary_ti = current_set[cpu];
if (!cpu_enable(cpu))
return 0;
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