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Kernel: Prevent recursive calls into the scheduler
Upon leaving a critical section (such as a SpinLock) we need to check if we're already asynchronously invoking the Scheduler. Otherwise we might end up triggering another context switch as soon as leaving the scheduler lock. Fixes #2883
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a19304c9d6
commit
728de56481
5 changed files with 136 additions and 21 deletions
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@ -623,6 +623,7 @@ static_assert(GDT_SELECTOR_CODE0 + 16 == GDT_SELECTOR_CODE3); // CS3 = CS0 + 16
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static_assert(GDT_SELECTOR_CODE0 + 24 == GDT_SELECTOR_DATA3); // SS3 = CS0 + 32
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class ProcessorInfo;
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class SchedulerPerProcessorData;
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struct MemoryManagerData;
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struct ProcessorMessageEntry;
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@ -683,6 +684,7 @@ class Processor {
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ProcessorInfo* m_info;
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MemoryManagerData* m_mm_data;
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SchedulerPerProcessorData* m_scheduler_data;
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Thread* m_current_thread;
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Thread* m_idle_thread;
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@ -770,6 +772,16 @@ public:
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return get_fs() == GDT_SELECTOR_PROC && read_fs_u32(0) != 0;
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}
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ALWAYS_INLINE void set_scheduler_data(SchedulerPerProcessorData& scheduler_data)
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{
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m_scheduler_data = &scheduler_data;
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}
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ALWAYS_INLINE SchedulerPerProcessorData& get_scheduler_data() const
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{
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return *m_scheduler_data;
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}
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ALWAYS_INLINE void set_mm_data(MemoryManagerData& mm_data)
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{
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m_mm_data = &mm_data;
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@ -920,16 +932,13 @@ class ScopedCritical {
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public:
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ScopedCritical()
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{
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m_valid = true;
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Processor::current().enter_critical(m_prev_flags);
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enter();
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}
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~ScopedCritical()
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{
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if (m_valid) {
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m_valid = false;
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Processor::current().leave_critical(m_prev_flags);
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}
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if (m_valid)
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leave();
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}
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ScopedCritical(ScopedCritical&& from)
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@ -955,6 +964,20 @@ public:
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m_prev_flags &= ~0x200;
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}
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void leave()
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{
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ASSERT(m_valid);
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m_valid = false;
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Processor::current().leave_critical(m_prev_flags);
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}
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void enter()
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{
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ASSERT(!m_valid);
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m_valid = true;
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Processor::current().enter_critical(m_prev_flags);
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}
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private:
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u32 m_prev_flags { 0 };
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bool m_valid { false };
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