From: Yafang Shao <laoar.shao@gmail.com>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com,
baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com,
npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com,
hannes@cmpxchg.org, usamaarif642@gmail.com,
gutierrez.asier@huawei-partners.com, willy@infradead.org,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net,
bpf@vger.kernel.org, linux-mm@kvack.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v6 mm-new 04/10] bpf: mark vma->vm_mm as trusted
Date: Thu, 28 Aug 2025 14:12:12 +0800 [thread overview]
Message-ID: <CALOAHbDxxN8CsGwAWQU4XRkG8NvU-chbiDv=oKW0mADSf1vaiQ@mail.gmail.com> (raw)
In-Reply-To: <bca7698c-7617-4584-afaa-4c3d2c971a79@lucifer.local>
On Wed, Aug 27, 2025 at 11:46 PM Lorenzo Stoakes
<lorenzo.stoakes@oracle.com> wrote:
>
> On Tue, Aug 26, 2025 at 03:19:42PM +0800, Yafang Shao wrote:
> > Every VMA must have an associated mm_struct, and it is safe to access
>
> Err this isn't true? Pretty sure special VMAs don't have that set.
I’m not aware of any VMA that doesn’t belong to an mm_struct. If there
is such a case, it would be helpful if you could point it out. In any
case, I’ll remove the VMA-related code in the next version since it’s
unnecessary.
>
> > outside of RCU. Thus, we can mark it as trusted. With this change, BPF
> > helpers can safely access vma->vm_mm to retrieve the associated task
> > from the VMA.
>
> On the basis of above don't think this is valid.
>
--
Regards
Yafang
next prev parent reply other threads:[~2025-08-28 6:12 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-26 7:19 [PATCH v6 mm-new 00/10] mm, bpf: BPF based THP order selection Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 01/10] mm: thp: add support for " Yafang Shao
2025-08-27 2:57 ` kernel test robot
2025-08-27 11:39 ` Yafang Shao
2025-08-27 15:04 ` Lorenzo Stoakes
2025-08-27 15:03 ` Lorenzo Stoakes
2025-08-28 5:54 ` Yafang Shao
2025-08-28 10:50 ` Lorenzo Stoakes
2025-08-29 3:01 ` Yafang Shao
2025-08-29 10:42 ` Lorenzo Stoakes
2025-08-31 3:11 ` Yafang Shao
2025-09-01 11:39 ` Lorenzo Stoakes
2025-09-02 2:48 ` Yafang Shao
2025-09-02 7:50 ` Lorenzo Stoakes
2025-09-03 2:10 ` Yafang Shao
2025-08-29 4:56 ` Barry Song
2025-08-29 5:36 ` Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 02/10] mm: thp: add a new kfunc bpf_mm_get_mem_cgroup() Yafang Shao
2025-08-27 15:34 ` Lorenzo Stoakes
2025-08-27 20:50 ` Shakeel Butt
2025-08-28 10:40 ` Lorenzo Stoakes
2025-08-28 16:00 ` Shakeel Butt
2025-08-29 10:45 ` Lorenzo Stoakes
2025-08-28 6:57 ` Yafang Shao
2025-08-28 10:42 ` Lorenzo Stoakes
2025-08-29 3:09 ` Yafang Shao
2025-08-27 20:45 ` Shakeel Butt
2025-08-28 6:58 ` Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 03/10] mm: thp: add a new kfunc bpf_mm_get_task() Yafang Shao
2025-08-27 15:42 ` Lorenzo Stoakes
2025-08-27 21:50 ` Andrii Nakryiko
2025-08-28 6:50 ` Yafang Shao
2025-08-28 10:51 ` Lorenzo Stoakes
2025-08-29 3:15 ` Yafang Shao
2025-08-29 10:42 ` Lorenzo Stoakes
2025-08-28 6:47 ` Yafang Shao
2025-08-29 10:43 ` Lorenzo Stoakes
2025-08-26 7:19 ` [PATCH v6 mm-new 04/10] bpf: mark vma->vm_mm as trusted Yafang Shao
2025-08-27 15:45 ` Lorenzo Stoakes
2025-08-28 6:12 ` Yafang Shao [this message]
2025-08-28 11:11 ` Lorenzo Stoakes
2025-08-29 3:05 ` Yafang Shao
2025-08-29 10:49 ` Lorenzo Stoakes
2025-08-31 3:16 ` Yafang Shao
2025-09-01 10:36 ` Lorenzo Stoakes
2025-08-26 7:19 ` [PATCH v6 mm-new 05/10] selftests/bpf: add a simple BPF based THP policy Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 06/10] selftests/bpf: add test case for khugepaged fork Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 07/10] selftests/bpf: add test case to update thp policy Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 08/10] selftests/bpf: add test cases for invalid thp_adjust usage Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 09/10] Documentation: add BPF-based THP adjustment documentation Yafang Shao
2025-08-26 7:19 ` [PATCH v6 mm-new 10/10] MAINTAINERS: add entry for BPF-based THP adjustment Yafang Shao
2025-08-27 15:47 ` Lorenzo Stoakes
2025-08-28 6:08 ` Yafang Shao
2025-08-26 7:42 ` [PATCH v6 mm-new 00/10] mm, bpf: BPF based THP order selection David Hildenbrand
2025-08-26 8:33 ` Lorenzo Stoakes
2025-08-26 12:06 ` Yafang Shao
2025-08-26 9:52 ` Usama Arif
2025-08-26 12:10 ` Yafang Shao
2025-08-26 12:03 ` Yafang Shao
2025-08-27 13:14 ` Lorenzo Stoakes
2025-08-28 2:58 ` Yafang Shao
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