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authorYonghong Song <[email protected]>2024-01-04 08:57:44 -0800
committerAlexei Starovoitov <[email protected]>2024-01-04 10:18:14 -0800
commit9ddf872b47e3ac8f27dbfc4a4737a976c7588de6 (patch)
tree3cbc51ba9cbb22d6bcb1deb127146fadf31c260e
parentc040e902b07e946ff73e81d4abb4347d2c0b6044 (diff)
bpf: Remove unnecessary cpu == 0 check in memalloc
After merging the patch set [1] to reduce memory usage for bpf_global_percpu_ma, Alexei found a redundant check (cpu == 0) in function bpf_mem_alloc_percpu_unit_init() ([2]). Indeed, the check is unnecessary since c->unit_size will be all NULL or all non-NULL for all cpus before for_each_possible_cpu() loop. Removing the check makes code less confusing. [1] https://lore.kernel.org/all/[email protected]/ [2] https://lore.kernel.org/all/[email protected]/ Signed-off-by: Yonghong Song <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexei Starovoitov <[email protected]>
-rw-r--r--kernel/bpf/memalloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c
index 460c8f38fed6..550f02e2cb13 100644
--- a/kernel/bpf/memalloc.c
+++ b/kernel/bpf/memalloc.c
@@ -613,7 +613,7 @@ int bpf_mem_alloc_percpu_unit_init(struct bpf_mem_alloc *ma, int size)
for_each_possible_cpu(cpu) {
cc = per_cpu_ptr(pcc, cpu);
c = &cc->cache[i];
- if (cpu == 0 && c->unit_size)
+ if (c->unit_size)
break;
c->unit_size = unit_size;