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scx_rusty: Refactor access operation of nodemask

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Within "task_set_preferred_mempolicy_dom_mask", it tries to access the
nodemask of the task directly. BPF verifier might not allow it under all
situation.

Use BPF_CORE_READ() macro to let libbpf handle CO-RE relocate to make
sure it can pass the verifier.

Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
This commit is contained in:
I Hsin Cheng 2024-11-28 22:08:58 +08:00
parent 1f4bd50e2f
commit 2f334dba85
1 changed files with 1 additions and 2 deletions
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scheds/rust/scx_rusty/src/bpf/main.bpf.c
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@ -1264,7 +1264,6 @@ static void task_set_preferred_mempolicy_dom_mask(struct task_struct *p,
{
u32 node_id;
u32 val = 0;
nodemask_t *node_mask = &p->mempolicy->nodes;
void *mask;
taskc->preferred_dom_mask = 0;
@ -1286,7 +1285,7 @@ static void task_set_preferred_mempolicy_dom_mask(struct task_struct *p,
return;
}
mask = BPF_CORE_READ(node_mask, bits);
mask = BPF_CORE_READ(p, mempolicy, nodes.bits);
if (bpf_core_read(&val, sizeof(val), mask))
return;