Hi：
Could the crash related to this patch ?
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commitdiff;h=45bfd7bfc6cf32f8e60bb91b32349f0b5090eea3
Since now TLB state change to TLBSTATE_OK(mmu_context.h:40) is before cpumask_clear_cpu(line 49).
Could it possible that right after execute line 40 of mmu_context.h, CPU revice IPI from other CPU to
flush the mm, and when in interrupt, find the TLB state happened to be TLBSTATE_OK. Which conflicts.
Thanks.
arch/x86/include/asm/mmu_context.h
33 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
34 <+++<+++<+++ struct task_struct *tsk)
35 {
36 <+++unsigned cpu = smp_processor_id();
37
38 <+++if (likely(prev != next)) {
39 #ifdef CONFIG_SMP
40 <+++<+++percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
41 <+++<+++percpu_write(cpu_tlbstate.active_mm, next);
42 #endif
43 <+++<+++cpumask_set_cpu(cpu, mm_cpumask(next));
&nb
sp;44
45 <+++<+++/* Re-load page tables */
46 <+++<+++load_cr3(next->pgd);
47
48 <+++<+++/* stop flush ipis for the previous mm */
49 <+++<+++cpumask_clear_cpu(cpu, mm_cpumask(prev));
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