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fix(ke): fix off-by-one in qspinlocks

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Loïc Grégoire
2026-04-19 21:08:23 -04:00
parent a46782adca
commit 6b7de48d0a
1 changed files with 2 additions and 2 deletions
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src/kern/spinlock.zig
+2 -2
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@@ -126,7 +126,7 @@ const pcpu = ke.CpuLocal(PerCpu, undefined);
export const qspinlock_percpu_init linksection(r.percpu_init) = &init_cpu; export const qspinlock_percpu_init linksection(r.percpu_init) = &init_cpu;
/// Initialize a CPU for use by the scheduler. /// Initialize a CPU's MCS nodes.
fn init_cpu() linksection(r.init) callconv(.c) void { fn init_cpu() linksection(r.init) callconv(.c) void {
var cpu = pcpu.local(); var cpu = pcpu.local();
cpu.curr_idx = 0; cpu.curr_idx = 0;
@@ -268,7 +268,7 @@ pub const QSpinLock = LockTemplate(struct {
if (old.cpu != 0) { if (old.cpu != 0) {
// Someone else is already waiting, link ourselves to their node. // Someone else is already waiting, link ourselves to their node.
const prev = &pcpu.remote(@intCast(old.cpu)).nodes[old.idx]; const prev = &pcpu.remote(@intCast(old.cpu - 1)).nodes[old.idx];
prev.next.store(node, .release); prev.next.store(node, .release);