From: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
To: Dev Jain <dev.jain@arm.com>
Cc: Aboorva Devarajan <aboorvad@linux.ibm.com>,
akpm@linux-foundation.org, Liam.Howlett@oracle.com,
shuah@kernel.org, pfalcato@suse.de, david@redhat.com,
ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com,
ryan.roberts@arm.com, baohua@kernel.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
donettom@linux.ibm.com, ritesh.list@gmail.com
Subject: Re: [PATCH 1/6] mm/selftests: Fix virtual_address_range test issues.
Date: Wed, 18 Jun 2025 12:37:29 +0100 [thread overview]
Message-ID: <79bdd993-0e9c-4d7d-b42c-4b5750eff140@lucifer.local> (raw)
In-Reply-To: <f8730d2d-41bf-407a-b44b-6cb9c1e5d4b3@arm.com>
On Wed, Jun 18, 2025 at 04:58:56PM +0530, Dev Jain wrote:
>
> MAP_CHUNK_SIZE was chosen randomly. Good to see it translates into something logical : )
>
> So I guess I am correct, if we can find two VMAs (except at the edge of the high addr boundary)
> with a gap of greater than MAP_CHUNK_SIZE then there is a bug in mmap().
No haha, not at all!! Firstly fixed addressed override a lot of this, secondly
the 256 page gap (which is configurable btw) is only applicable for mappings
below a stack (in stack grow down arch).
This assumption is totally incorrect, sorry. I'd suggest making assertions about
this is really not all that useful, as things vary by arch and kernel
configuration.
next prev parent reply other threads:[~2025-06-18 11:37 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-16 16:06 [PATCH 0/6] selftests/mm: Fix false positives and skip unsupported tests Aboorva Devarajan
2025-06-16 16:06 ` [PATCH 1/6] mm/selftests: Fix virtual_address_range test issues Aboorva Devarajan
2025-06-16 16:27 ` Dev Jain
2025-06-18 10:06 ` Donet Tom
2025-06-18 10:35 ` Dev Jain
2025-06-18 11:22 ` Lorenzo Stoakes
2025-06-18 11:28 ` Dev Jain
2025-06-18 11:37 ` Lorenzo Stoakes [this message]
2025-06-18 11:45 ` Dev Jain
2025-06-18 11:57 ` Lorenzo Stoakes
2025-06-18 11:59 ` Lorenzo Stoakes
2025-06-18 13:58 ` Dev Jain
2025-06-18 14:07 ` Lorenzo Stoakes
2025-06-18 14:17 ` Dev Jain
2025-06-18 14:35 ` Lorenzo Stoakes
2025-06-18 14:43 ` Dev Jain
2025-06-19 8:23 ` Donet Tom
2025-06-19 9:02 ` Dev Jain
2025-06-19 15:31 ` Donet Tom
2025-06-19 16:14 ` Dev Jain
2025-06-20 14:45 ` Dev Jain
2025-06-21 17:55 ` Donet Tom
2025-06-23 4:53 ` Dev Jain
2025-06-23 4:55 ` Dev Jain
2025-06-23 17:32 ` Donet Tom
2025-06-24 6:15 ` Dev Jain
2025-06-25 9:36 ` Donet Tom
2025-06-25 10:45 ` Dev Jain
2025-06-25 12:52 ` Dev Jain
2025-06-25 17:17 ` Donet Tom
2025-06-26 3:57 ` Dev Jain
2025-06-26 5:42 ` Donet Tom
2025-06-26 5:55 ` Dev Jain
2025-06-26 6:35 ` Dev Jain
2025-06-26 6:52 ` Donet Tom
2025-06-18 11:50 ` Lorenzo Stoakes
2025-06-16 16:06 ` [PATCH 2/6] selftest/mm: Fix ksm_funtional_test failures Aboorva Devarajan
2025-06-16 17:04 ` Liam R. Howlett
2025-06-17 15:10 ` donettom
2025-06-16 16:06 ` [PATCH 3/6] selftests/mm : fix test_prctl_fork_exec failure Aboorva Devarajan
2025-06-16 16:28 ` Dev Jain
2025-06-17 15:04 ` donettom
2025-06-16 16:06 ` [PATCH 4/6] mm/selftests: Fix split_huge_page_test failure on systems with 64KB page size Aboorva Devarajan
2025-06-16 16:06 ` [PATCH 5/6] selftests/mm: Fix child process exit codes in KSM tests Aboorva Devarajan
2025-06-16 16:06 ` [PATCH 6/6] selftests/mm: Mark thuge-gen as skipped if shmmax is too small or no 1G pages Aboorva Devarajan
2025-06-16 16:11 ` [PATCH 0/6] selftests/mm: Fix false positives and skip unsupported tests Lorenzo Stoakes
2025-06-17 7:53 ` Aboorva Devarajan
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