Smatch complains about returning negative error codes from a type bool function. kernel/cgroup/cpuset.c:705 cpu_exclusive_check() warn: signedness bug returning '(-22)' The code works correctly, but it is confusing. The current behavior is that cpu_exclusive_check() returns true if it's *NOT* exclusive. Rename it to cpusets_are_exclusive() and reverse the returns so it returns true if it is exclusive and false if it's not. Update both callers as well. Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <error27@xxxxxxxxx> Closes: https://lore.kernel.org/r/202309201706.2LhKdM6o-lkp@xxxxxxxxx/ Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx> --- This is based on sattic analysis, only compile tested --- kernel/cgroup/cpuset.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 15f399153a2e..afefddd33c3e 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -719,18 +719,18 @@ static inline struct cpumask *fetch_xcpus(struct cpuset *cs) } /* - * cpu_exclusive_check() - check if two cpusets are exclusive + * cpusets_are_exclusive() - check if two cpusets are exclusive * - * Return 0 if exclusive, -EINVAL if not + * Return true if exclusive, false if not */ -static inline bool cpu_exclusive_check(struct cpuset *cs1, struct cpuset *cs2) +static inline bool cpusets_are_exclusive(struct cpuset *cs1, struct cpuset *cs2) { struct cpumask *xcpus1 = fetch_xcpus(cs1); struct cpumask *xcpus2 = fetch_xcpus(cs2); if (cpumask_intersects(xcpus1, xcpus2)) - return -EINVAL; - return 0; + return false; + return true; } /* @@ -833,7 +833,7 @@ static int validate_change(struct cpuset *cur, struct cpuset *trial) cpuset_for_each_child(c, css, par) { if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) && c != cur) { - if (cpu_exclusive_check(trial, c)) + if (!cpusets_are_exclusive(trial, c)) goto out; } if ((is_mem_exclusive(trial) || is_mem_exclusive(c)) && @@ -1864,7 +1864,7 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd, cpuset_for_each_child(child, css, parent) { if (child == cs) continue; - if (cpu_exclusive_check(cs, child)) { + if (!cpusets_are_exclusive(cs, child)) { exclusive = false; break; } -- 2.41.0
