Kernel: Merge PurgeableVMObject into AnonymousVMObject

This implements memory commitments and lazy-allocation of committed
memory.

1 files changed, 11 insertions, 2 deletions

diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
index e1b1bd5e5a..2b7e1b7ea6 100644
--- a/Kernel/Thread.cpp
+++ b/Kernel/Thread.cpp
@@ -86,7 +86,12 @@ Thread::Thread(NonnullRefPtr<Process> process)
 
     m_tss.cr3 = m_process->page_directory().cr3();
 
-    m_kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, String::format("Kernel Stack (Thread %d)", m_tid.value()), Region::Access::Read | Region::Access::Write, false, true);
+    m_kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, String::format("Kernel Stack (Thread %d)", m_tid.value()), Region::Access::Read | Region::Access::Write, false, AllocationStrategy::AllocateNow);
+    if (!m_kernel_stack_region) {
+        // Abort creating this thread, was_created() will return false
+        return;
+    }
+
     m_kernel_stack_region->set_stack(true);
     m_kernel_stack_base = m_kernel_stack_region->vaddr().get();
     m_kernel_stack_top = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & 0xfffffff8u;
@@ -858,6 +863,10 @@ RegisterState& Thread::get_register_dump_from_stack()
 RefPtr<Thread> Thread::clone(Process& process)
 {
     auto clone = adopt(*new Thread(process));
+    if (!clone->was_created()) {
+        // We failed to clone this thread
+        return {};
+    }
     memcpy(clone->m_signal_action_data, m_signal_action_data, sizeof(m_signal_action_data));
     clone->m_signal_mask = m_signal_mask;
     memcpy(clone->m_fpu_state, m_fpu_state, sizeof(FPUState));
@@ -1052,7 +1061,7 @@ KResult Thread::make_thread_specific_region(Badge<Process>)
     if (!process().m_master_tls_region)
         return KSuccess;
 
-    auto* region = process().allocate_region({}, thread_specific_region_size(), "Thread-specific", PROT_READ | PROT_WRITE, true);
+    auto* region = process().allocate_region({}, thread_specific_region_size(), "Thread-specific", PROT_READ | PROT_WRITE);
     if (!region)
         return KResult(-ENOMEM);