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Kernel/SMP: Make entering/leaving critical sections multi-processor safe

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By making these functions static we close a window where we could get
preempted after calling Processor::current() and move to another
processor.

Co-authored-by: Tom <tomut@yahoo.com>
This commit is contained in:
Andreas Kling 2021-08-10 01:16:08 +02:00
parent 369e3da6a2
commit 9babb92a4b
11 changed files with 82 additions and 53 deletions
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4
Kernel/Thread.h
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@ -921,9 +921,9 @@ public:
for (;;) {
// Yield to the scheduler, and wait for us to resume unblocked.
VERIFY(!g_scheduler_lock.own_lock());
VERIFY(Processor::current().in_critical());
VERIFY(Processor::in_critical());
yield_assuming_not_holding_big_lock();
VERIFY(Processor::current().in_critical());
VERIFY(Processor::in_critical());
ScopedSpinLock block_lock2(m_block_lock);
if (should_be_stopped() || state() == Stopped) {