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cgroup: Avoid -Wstringop-overflow warnings

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Address the following -Wstringop-overflow warnings seen when
built with ARM architecture and aspeed_g4_defconfig configuration
(notice that under this configuration CGROUP_SUBSYS_COUNT == 0):
kernel/cgroup/cgroup.c:1208:16: warning: 'find_existing_css_set' accessing 4 bytes in a region of size 0 [-Wstringop-overflow=]
kernel/cgroup/cgroup.c:1258:15: warning: 'css_set_hash' accessing 4 bytes in a region of size 0 [-Wstringop-overflow=]
kernel/cgroup/cgroup.c:6089:18: warning: 'css_set_hash' accessing 4 bytes in a region of size 0 [-Wstringop-overflow=]
kernel/cgroup/cgroup.c:6153:18: warning: 'css_set_hash' accessing 4 bytes in a region of size 0 [-Wstringop-overflow=]

These changes are based on commit d20d30ebb1 ("cgroup: Avoid compiler
warnings with no subsystems").

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2023-06-14 19:18:22 -06:00 committed by Tejun Heo
parent a04de42460
commit 36de5f303c
1 changed files with 6 additions and 0 deletions
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6
kernel/cgroup/cgroup.c
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@ -1198,6 +1198,9 @@ static struct css_set *find_css_set(struct css_set *old_cset,
unsigned long key;
int ssid;
if (!CGROUP_HAS_SUBSYS_CONFIG)
return NULL;
lockdep_assert_held(&cgroup_mutex);
/* First see if we already have a cgroup group that matches
@ -6017,6 +6020,9 @@ int __init cgroup_init(void)
struct cgroup_subsys *ss;
int ssid;
if (!CGROUP_HAS_SUBSYS_CONFIG)
return -EINVAL;
BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16);
BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files));
BUG_ON(cgroup_init_cftypes(NULL, cgroup_psi_files));