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Kernel: Convert Processor::in_irq() to static current_in_irq()

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This closes the race window between Processor::current() and a context
switch happening before in_irq().
This commit is contained in:
Andreas Kling 2021-08-22 12:21:31 +02:00
parent 3e3f760808
commit d60635cb9d
14 changed files with 37 additions and 39 deletions
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6
Kernel/Arch/x86/Processor.h
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@ -120,7 +120,7 @@ class Processor {
u32 m_gdt_length;
u32 m_cpu;
u32 m_in_irq;
FlatPtr m_in_irq {};
volatile u32 m_in_critical {};
static Atomic<u32> s_idle_cpu_mask;
@ -329,9 +329,9 @@ public:
return Processor::id() == 0;
}
ALWAYS_INLINE u32& in_irq()
ALWAYS_INLINE static FlatPtr current_in_irq()
{
return m_in_irq;
return read_gs_ptr(__builtin_offsetof(Processor, m_in_irq));
}
ALWAYS_INLINE static void restore_in_critical(u32 critical)