mainline inclusion
from mainline-v5.19-rc4
commit ea18d434
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OHOB
CVE: NA

--------------------------------

compute_return_era() always returns 0, make it return void,
and then no need to check its return value for its callers.
Signed-off-by: NTiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>