From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Yeoreum Yun <yeoreum.yun@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R. Howlett" <liam@infradead.org>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 3/3] kselftest: mm: introduce alloc_isolated_mem()
Date: Thu, 10 Sep 2026 15:14:36 +0200 [thread overview]
Message-ID: <8d27168e-5443-4073-bc65-24ddbe32e29a@kernel.org> (raw)
In-Reply-To: <aqKj5ojQ3dabOV5g@e129823.arm.com>
On 9/10/26 14:34, Yeoreum Yun wrote:
> On Thu, Sep 10, 2026 at 02:25:40PM +0200, David Hildenbrand (Arm) wrote:
>> On 9/10/26 14:16, Yeoreum Yun wrote:
>>>
>>> True. I overlooked guard bit is sticky.
>>>
>>>
>>> It's enough but alloc_isolated_mem() could be modified to allocate with
>>> PROT_NONE first and then change the prot.
>>>
>>> It seems whether make a helper or testcase should write the code
>>> properly in case of unwanted VMA merge.
>>>
>>> IMHO, instead of testcase write them all
>>
>> So far I am aware of exactly one test case, which others do absolutely need this?
>
> True. I'll respin with your suggestion.
Don't get me wrong, if we'll need this for other tests we can add helpers. But
for a single user adding a helper is not really worth it.
--
Cheers,
David
next prev parent reply other threads:[~2026-09-10 13:14 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 8:19 [PATCH v5 0/3] kselftest: mm: fix some failure of split_huge_page_test Yeoreum Yun
2026-09-07 8:19 ` [PATCH v5 1/3] kselftest: mm: prevent random failure of huge page split for khugepaged Yeoreum Yun
2026-09-10 10:15 ` David Hildenbrand (Arm)
2026-09-07 8:19 ` [PATCH v5 2/3] kselftest: mm: replace usage of /proc/self/smaps for check_huge_xxx() helper Yeoreum Yun
2026-09-10 10:20 ` David Hildenbrand (Arm)
2026-09-10 10:54 ` Yeoreum Yun
2026-09-10 10:59 ` David Hildenbrand (Arm)
2026-09-10 11:25 ` Yeoreum Yun
2026-09-10 11:27 ` David Hildenbrand (Arm)
2026-09-10 11:31 ` Yeoreum Yun
2026-09-07 8:19 ` [PATCH v5 3/3] kselftest: mm: introduce alloc_isolated_mem() Yeoreum Yun
2026-09-10 10:34 ` David Hildenbrand (Arm)
2026-09-10 11:02 ` Yeoreum Yun
2026-09-10 11:14 ` David Hildenbrand (Arm)
2026-09-10 11:22 ` Yeoreum Yun
2026-09-10 11:24 ` David Hildenbrand (Arm)
2026-09-10 11:30 ` Yeoreum Yun
2026-09-10 11:55 ` David Hildenbrand (Arm)
2026-09-10 12:16 ` Yeoreum Yun
2026-09-10 12:22 ` Yeoreum Yun
2026-09-10 12:25 ` David Hildenbrand (Arm)
2026-09-10 12:34 ` Yeoreum Yun
2026-09-10 13:14 ` David Hildenbrand (Arm) [this message]
2026-09-10 13:52 ` ;, Re: ;, [PATCH v5 3/3] kselftest: ;, mm: introducealloc_isolated_mem; Yeoreum Yun
2026-09-10 10:15 ` [PATCH v5 0/3] kselftest: mm: fix some failure of split_huge_page_test David Hildenbrand (Arm)
2026-09-10 10:31 ` Yeoreum Yun
2026-09-10 10:45 ` David Hildenbrand (Arm)
2026-09-10 11:16 ` Yeoreum Yun
2026-09-10 11:23 ` David Hildenbrand (Arm)
2026-09-10 11:35 ` Yeoreum Yun
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