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kata_object_alloc_in_cnode: misc fixups

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- optimize CNode size calc
- remove an extranous map_err that hid the true error

Change-Id: I63a43dff7c242d49f2f968abdde4134ac300d0b1
GitOrigin-RevId: 9e8e9ec4b3bb33dca53ee45aed231836dec7d6e4
This commit is contained in:
Sam Leffler 2022-06-23 03:13:34 +00:00
parent 9920153e10
commit b0d1b6efac
1 changed files with 3 additions and 7 deletions
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10
apps/system/components/MemoryManager/kata-memory-interface/src/lib.rs
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@ -424,18 +424,14 @@ pub fn kata_object_alloc_in_cnode(
objs: Vec<ObjDesc>,
) -> Result<ObjDescBundle, MemoryManagerError> {
fn next_log2(value: usize) -> usize {
let mut size_bits = 0;
while value > (1 << size_bits) {
size_bits += 1;
}
size_bits
// NB: BITS & leading_zeros return u32
(1 + usize::BITS - usize::leading_zeros(value)) as usize
}
// NB: CNode size depends on how many objects are requested.
let cnode_depth = next_log2(objs.iter().map(|od| od.count).sum());
// Request a top-level CNode.
let cnode = kata_cnode_alloc(cnode_depth)
.map_err(|_| MemoryManagerError::MmeAllocFailed)?;
let cnode = kata_cnode_alloc(cnode_depth)?;
// Now construct the request for |objs| with |cnode| as the container.
let request = ObjDescBundle::new(