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Kernel/SMP: Don't enable interrupts in Processor::exit_trap

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Enter a critical section in Processor::exit_trap so that processing
SMP messages doesn't enable interrupts upon leaving. We need to delay
this until the end where we call into the Scheduler if exiting the
trap results in being outside of a critical section and irq handler.

Co-authored-by: Tom <tomut@yahoo.com>
This commit is contained in:
Andreas Kling 2021-08-08 22:22:38 +02:00
parent cd0fc7f52c
commit f27e7bbbf4
3 changed files with 27 additions and 6 deletions
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4
Kernel/Arch/x86/x86_64/Processor.cpp
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@ -169,6 +169,8 @@ void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)
VERIFY(is_kernel_mode());
dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context --> switching out of: {} {}", VirtualAddress(from_thread), *from_thread);
// m_in_critical is restored in enter_thread_context
from_thread->save_critical(m_in_critical);
// clang-format off
@ -238,8 +240,6 @@ void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)
// clang-format on
dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context <-- from {} {} to {} {}", VirtualAddress(from_thread), *from_thread, VirtualAddress(to_thread), *to_thread);
Processor::current().restore_in_critical(to_thread->saved_critical());
}
UNMAP_AFTER_INIT void Processor::initialize_context_switching(Thread& initial_thread)