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Kernel: Pass "shared" flag to Region constructor

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Before this change, we would sometimes map a region into the address
space with !is_shared(), and then moments later call set_shared(true).

I found this very confusing while debugging, so this patch makes us pass
the initial shared flag to the Region constructor, ensuring that it's in
the correct state by the time we first map the region.
This commit is contained in:
Andreas Kling 2021-01-02 16:38:05 +01:00
parent 1898aa8cd4
commit 5dae85afe7
10 changed files with 21 additions and 20 deletions
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9
Kernel/VM/Region.cpp
View file

@ -40,13 +40,14 @@
namespace Kernel {
Region::Region(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, u8 access, bool cacheable, bool kernel)
Region::Region(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, u8 access, bool cacheable, bool kernel, bool shared)
: PurgeablePageRanges(vmobject)
, m_range(range)
, m_offset_in_vmobject(offset_in_vmobject)
, m_vmobject(move(vmobject))
, m_name(name)
, m_access(access)
, m_shared(shared)
, m_cacheable(cacheable)
, m_kernel(kernel)
{
@ -236,9 +237,9 @@ size_t Region::amount_shared() const
return bytes;
}
NonnullOwnPtr<Region> Region::create_user_accessible(Process* owner, const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable)
NonnullOwnPtr<Region> Region::create_user_accessible(Process* owner, const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable, bool shared)
{
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, false);
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, false, shared);
if (owner)
region->m_owner = owner->make_weak_ptr();
region->m_user_accessible = true;
@ -247,7 +248,7 @@ NonnullOwnPtr<Region> Region::create_user_accessible(Process* owner, const Range
NonnullOwnPtr<Region> Region::create_kernel_only(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable)
{
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, true);
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, true, false);
region->m_user_accessible = false;
return region;
}