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bpf: Remove unnecessary cpu == 0 check in memalloc

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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/20231222031729.1287957-1-yonghong.song@linux.dev/
  [2] https://lore.kernel.org/all/20231222031745.1289082-1-yonghong.song@linux.dev/

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240104165744.702239-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2024-01-04 08:57:44 -08:00 • committed by Alexei Starovoitov
parent c040e902b0
commit 9ddf872b47
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/memalloc.c
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@ -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;