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24a3c7af3b
There is room for improvement, so let's clean up a bit:
(1) Define "4" as a constant.
(2) SKIP if we fail to allocate all THPs (e.g., fragmented) and add
recovery code for all other failure cases: no need to exit the test.
(3) Rename "len" to thp_area_size, and "one_page" to "thp_area".
(4) Allocate a new area "page_area" into which we will mremap the
pages; add "page_area_size". Now we can easily merge the two
mremap instances into a single one.
(5) Iterate THPs instead of bytes when checking for missed THPs after
mremap.
(6) Rename "pte_mapped2" to "tmp", used to verify mremap(MAP_FIXED)
result.
(7) Split the corruption test from the failed-split test, so we can just
iterate bytes vs. thps naturally.
(8) Extend comments and clarify why we are using mremap in the first
place.
Link: https://lkml.kernel.org/r/20250903070253.34556-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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