linux-kernel - [PATCH] cgroup/misc: Store atomic64

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Message-Id: <20230721120231.13916-1-haitao.huang@linux.intel.com>
Date:   Fri, 21 Jul 2023 05:02:31 -0700
From:   Haitao Huang <haitao.huang@...ux.intel.com>
To:     tj@...nel.org
Cc:     cgroups@...r.kernel.org, dave.hansen@...ux.intel.com,
        haitao.huang@...ux.intel.com, hannes@...xchg.org,
        jarkko@...nel.org, kai.huang@...el.com, kristen@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        lizefan.x@...edance.com, reinette.chatre@...el.com,
        vipinsh@...gle.com, zhiquan1.li@...el.com
Subject: [PATCH] cgroup/misc: Store atomic64_t reads to u64

Change 'new_usage' type to u64 so it can be compared with unsigned 'max'
and 'capacity' properly even if the value crosses the signed boundary.

Signed-off-by: Haitao Huang <haitao.huang@...ux.intel.com>
---
 kernel/cgroup/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c
index abbe9aa5cdd1..79a3717a5803 100644
--- a/kernel/cgroup/misc.c
+++ b/kernel/cgroup/misc.c
@@ -142,7 +142,7 @@ int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount)
 	struct misc_cg *i, *j;
 	int ret;
 	struct misc_res *res;
-	s64 new_usage;
+	u64 new_usage;
 
 	if (!(valid_type(type) && cg && READ_ONCE(misc_res_capacity[type])))
 		return -EINVAL;

base-commit: 32bf85c60ca3584a7ba3bef19da2779b73b2e7d6
-- 
2.25.1