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Kernel: Remove Range "valid" state and use Optional<Range> instead

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It's easier to understand VM ranges if they are always valid. We can
simply use an empty Optional<Range> to encode absence when needed.
This commit is contained in:
Andreas Kling 2021-01-27 21:01:45 +01:00
parent 67bc5e0bbd
commit e67402c702
8 changed files with 39 additions and 37 deletions
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4
Kernel/Process.cpp
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@ -116,7 +116,7 @@ bool Process::in_group(gid_t gid) const
return m_gid == gid || m_extra_gids.contains_slow(gid);
}
Range Process::allocate_range(VirtualAddress vaddr, size_t size, size_t alignment)
Optional<Range> Process::allocate_range(VirtualAddress vaddr, size_t size, size_t alignment)
{
vaddr.mask(PAGE_MASK);
size = PAGE_ROUND_UP(size);
@ -195,7 +195,7 @@ bool Process::deallocate_region(Region& region)
Region* Process::find_region_from_range(const Range& range)
{
ScopedSpinLock lock(m_lock);
if (m_region_lookup_cache.range == range && m_region_lookup_cache.region)
if (m_region_lookup_cache.range.has_value() && m_region_lookup_cache.range.value() == range && m_region_lookup_cache.region)
return m_region_lookup_cache.region.unsafe_ptr();
size_t size = PAGE_ROUND_UP(range.size());