From: Muchun Song <muchun.song@linux.dev>
To: Kaitao Cheng <kaitao.cheng@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>,
David Hildenbrand <david@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
Frank van der Linden <fvdl@google.com>,
Michal Hocko <mhocko@suse.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Chris Down <chris@chrisdown.name>,
Roman Gushchin <roman.gushchin@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Kaitao Cheng <chengkaitao@kylinos.cn>
Subject: Re: [PATCH 1/3] mm/hugetlb_cma: fix incorrect hugetlb_cma_size assignment on malformed input
Date: Wed, 28 Oct 2026 21:47:32 +0800 [thread overview]
Message-ID: <B3545C17-96BB-4A17-937F-3C91F8A0A1CF@linux.dev> (raw)
In-Reply-To: <20261028113319.38544-2-kaitao.cheng@linux.dev>
> On Oct 28, 2026, at 19:33, Kaitao Cheng <kaitao.cheng@linux.dev> wrote:
>
> From: Kaitao Cheng <chengkaitao@kylinos.cn>
>
> When hugetlb_cma contains a global size after node-specific entries,
> cmdline_parse_hugetlb_cma() enters the global branch and reparses the
> original parameter string. For hugetlb_cma=1:2G,4G, this interprets the
> initial node ID as a one-byte global size and clears the 2 GiB reservation
> recorded for node 1.
>
> Global and node-specific formats cannot be mixed. Return -EINVAL when a
> global entry follows a node-specific entry, before updating any settings.
> This preserves the valid prefix, so the example retains node 1's 2 GiB
> reservation and reports the malformed option.
>
> Fixes: 38e719ab2673 ("hugetlb: support node specified when using cma for gigantic hugepages")
> Closes: https://sashiko.dev/#/bug/linux-10f40d3e-3feb-4622-9da8-1fedecb2d0e2
> Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Acked-by: Muchun Song <muchun.song@linux.dev>
Thanks
next prev parent reply other threads:[~2026-10-28 13:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 11:33 [PATCH 0/3] Subject: mm/hugetlb: fix CMA handling and surplus allocation accounting Kaitao Cheng
2026-10-28 11:33 ` [PATCH 1/3] mm/hugetlb_cma: fix incorrect hugetlb_cma_size assignment on malformed input Kaitao Cheng
2026-10-28 13:47 ` Muchun Song [this message]
2026-10-28 14:46 ` Oscar Salvador (SUSE)
2026-10-28 11:33 ` [PATCH 2/3] mm/hugetlb: preserve CMA flag when returning folios to the pool Kaitao Cheng
2026-10-28 13:56 ` Muchun Song
2026-10-28 14:00 ` Zi Yan
2026-10-28 11:33 ` [PATCH 3/3] mm/hugetlb: fix NR_HUGETLB accounting for unused surplus folios Kaitao Cheng
2026-10-28 15:01 ` Oscar Salvador (SUSE)
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