From: "Lorenzo Stoakes (Oracle)" <ljs@kernel.org>
To: Qi Zheng <qi.zheng@linux.dev>
Cc: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com,
roman.gushchin@linux.dev, shakeel.butt@linux.dev,
muchun.song@linux.dev, david@kernel.org, ziy@nvidia.com,
harry.yoo@oracle.com, yosry.ahmed@linux.dev,
imran.f.khan@oracle.com, kamalesh.babulal@oracle.com,
axelrasmussen@google.com, yuanchu@google.com,
weixugc@google.com, chenridong@huaweicloud.com, mkoutny@suse.com,
akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com,
apais@linux.microsoft.com, lance.yang@linux.dev, bhe@redhat.com,
usamaarif642@gmail.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Qi Zheng <zhengqi.arch@bytedance.com>,
"Harry Yoo (Oracle)" <harry@kernel.org>
Subject: Re: [PATCH v2 4/4] mm: memcontrol: fix unexpected massive positive number in memcg_state_val_in_pages()
Date: Thu, 26 Mar 2026 09:21:23 +0000 [thread overview]
Message-ID: <a0bb6fee-a2f0-4742-a127-a4676ec59336@lucifer.local> (raw)
In-Reply-To: <54c2b09c-84f8-4118-96a6-acc13ca2f245@lucifer.local>
On Thu, Mar 26, 2026 at 09:16:50AM +0000, Lorenzo Stoakes (Oracle) wrote:
> /* Get the absolute value of (val * unit / PAGE_SIZE). */
> res = mult_frac(abs(val), unit, PAGE_SIZE);
> /* Round up zero values. */
> res = res ?: 1;
> /* Retain sign. */
> return val < 0 ? -res : res;
(If you think the comments are too much, you can drop them, and the code
essentially spells it out anyway)
Cheers, Lorenzo
next prev parent reply other threads:[~2026-03-26 9:21 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 14:13 [PATCH v2 0/4] fix unexpected type conversions and potential overflows Qi Zheng
2026-03-25 14:13 ` [PATCH v2 1/4] mm: memcontrol: correct the type of stats_updates to unsigned long Qi Zheng
2026-03-25 15:28 ` Lorenzo Stoakes (Oracle)
2026-03-26 2:32 ` Qi Zheng
2026-03-26 8:05 ` Lorenzo Stoakes (Oracle)
2026-03-26 8:19 ` Harry Yoo (Oracle)
2026-03-26 8:20 ` Qi Zheng
2026-03-25 14:13 ` [PATCH v2 2/4] mm: memcontrol: change val type to long in __mod_memcg_{lruvec_}state() Qi Zheng
2026-03-26 9:19 ` Lorenzo Stoakes (Oracle)
2026-03-26 14:37 ` David Laight
2026-03-25 14:13 ` [PATCH v2 3/4] mm: memcontrol: correct the nr_pages parameter type of mem_cgroup_update_lru_size() Qi Zheng
2026-03-25 14:13 ` [PATCH v2 4/4] mm: memcontrol: fix unexpected massive positive number in memcg_state_val_in_pages() Qi Zheng
2026-03-26 9:16 ` Lorenzo Stoakes (Oracle)
2026-03-26 9:21 ` Lorenzo Stoakes (Oracle) [this message]
2026-03-26 9:32 ` Qi Zheng
2026-03-26 9:38 ` Lorenzo Stoakes (Oracle)
2026-03-27 0:06 ` Andrew Morton
2026-03-25 14:24 ` [PATCH v2 0/4] fix unexpected type conversions and potential overflows Qi Zheng
2026-03-25 23:57 ` Andrew Morton
2026-03-26 0:28 ` Andrew Morton
2026-03-26 2:30 ` Qi Zheng
2026-03-26 3:27 ` Andrew Morton
2026-03-26 7:14 ` Michal Hocko
2026-03-26 7:51 ` Harry Yoo (Oracle)
2026-03-26 8:18 ` Michal Hocko
2026-03-26 9:22 ` Lorenzo Stoakes (Oracle)
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