From: Mike Kravetz <mike.kravetz@oracle.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
Rik van Riel <riel@surriel.com>, Michal Hocko <mhocko@suse.com>,
Peter Xu <peterx@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: mprotect and hugetlb mappings
Date: Wed, 5 Jul 2023 16:08:08 -0700 [thread overview]
Message-ID: <20230705230808.GA41006@monkey> (raw)
I was recently asked about the behavior of mprotect on a hugetlb
mapping where addr or addr+len is not hugetlb page size aligned. As
one might expect, EINVAL is returned in such cases. However, the man
page makes no mention of alignment requirements for hugetlb mappings.
I am happy to submit man page updates if people agree this is the correct
behavior. We might even want to check alignment earlier in the code
path as we fail when trying to split the vma today.
An alternative behavior would be to operate on whole hugetlb pages within
the range addr - addr+len.
--
Mike Kravetz
next reply other threads:[~2023-07-05 23:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-05 23:08 Mike Kravetz [this message]
2023-07-05 23:22 ` Matthew Wilcox
2023-07-05 23:53 ` Mike Kravetz
2023-07-17 16:19 ` Vlastimil Babka
2023-07-17 18:52 ` Mike Kravetz
2023-07-17 19:00 ` David Hildenbrand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230705230808.GA41006@monkey \
--to=mike.kravetz@oracle.com \
--cc=dave.hansen@linux.intel.com \
--cc=david@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=peterx@redhat.com \
--cc=riel@surriel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox