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cgroup/cpuset: Cleanup signedness issue in cpu_exclusive_check()

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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@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202309201706.2LhKdM6o-lkp@intel.com/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Harshit Mogalapalli
2023-09-26 23:58:01 -07:00
committed by Tejun Heo
parent 46c521bac5
commit 783a8334ec
1 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
kernel/cgroup/cpuset.c
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@@ -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 *xcpus1 = fetch_xcpus(cs1);
struct cpumask *xcpus2 = fetch_xcpus(cs2); struct cpumask *xcpus2 = fetch_xcpus(cs2);
if (cpumask_intersects(xcpus1, xcpus2)) if (cpumask_intersects(xcpus1, xcpus2))
return -EINVAL; return false;
return 0; return true;
} }
/* /*
@@ -833,7 +833,7 @@ static int validate_change(struct cpuset *cur, struct cpuset *trial)
cpuset_for_each_child(c, css, par) { cpuset_for_each_child(c, css, par) {
if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) && if ((is_cpu_exclusive(trial) || is_cpu_exclusive(c)) &&
c != cur) { c != cur) {
if (cpu_exclusive_check(trial, c)) if (!cpusets_are_exclusive(trial, c))
goto out; goto out;
} }
if ((is_mem_exclusive(trial) || is_mem_exclusive(c)) && if ((is_mem_exclusive(trial) || is_mem_exclusive(c)) &&
@@ -1875,7 +1875,7 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd,
cpuset_for_each_child(child, css, parent) { cpuset_for_each_child(child, css, parent) {
if (child == cs) if (child == cs)
continue; continue;
if (cpu_exclusive_check(cs, child)) { if (!cpusets_are_exclusive(cs, child)) {
exclusive = false; exclusive = false;
break; break;
} }