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[kernel] Fix bug in vmem commit

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When committing an area of vmem and splitting from a larger block, the
block that is returned was set to the unknown state, and the leading
block was incorrectly set to the desired state.

Also remove extra unused thread ctor.
This commit is contained in:
Justin C. Miller
2020-08-23 17:11:46 -07:00
parent e19fa377d7
commit 838776d7df
3 changed files with 11 additions and 25 deletions
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5
src/libraries/kutil/vm_space.cpp
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@@ -81,6 +81,7 @@ vm_space::split_out(node_type *node, uintptr_t start, size_t size, vm_state stat
node_type *next = new node_type;
next->address = start;
next->size = node->size - leading;
next->state = state;
node->size = leading;
node->state = old_state;
@@ -97,7 +98,7 @@ vm_space::split_out(node_type *node, uintptr_t start, size_t size, vm_state stat
if (node->end() > start + size) {
// Split off remaining into new node
size_t trailing = node->size - size;
size_t trailing = node->size - size;
node->size -= trailing;
node_type *next = new node_type;
@@ -227,7 +228,7 @@ vm_space::commit(uintptr_t start, size_t size)
{
if (start == 0) {
log::debug(logs::vmem, "Committing any region of size %llx", size);
node_type *node = find_empty(m_ranges.root(), size, vm_state::reserved);
node_type *node = find_empty(m_ranges.root(), size, vm_state::committed);
if (!node) {
log::debug(logs::vmem, " found no large enough region");
return 0;