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Patch series "unify PMD scan results and remove redundant cleanup", v2. This small series addresses two minor cleanup opportunities in the hugepage collapse logic. The initial motivation arose during a code review of madvise_collapse(), where it was noted that the function was missing a handler for SCAN_PMD_NONE. This oversight exposed the inconsistent handling of SCAN_PMD_NULL and SCAN_PMD_NONE. Since both scan results are functionally identical (they indicate the absence of a PTE table), the primary patch unifies them into a single, clearer identifier, SCAN_NO_PTE_TABLE. The series also takes the opportunity to remove a redundant clearing of the struct collapse_control. This patch (of 3): The structure struct collapse_control is being unnecessarily cleared twice during the huge page collapse process. Both hpage_collapse_scan_file() and hpage_collapse_scan_pmd() currently perform a clear operation on this structure. Remove the redundant clear operation. Link: https://lkml.kernel.org/r/20251114030028.7035-1-richard.weiyang@gmail.com Link: https://lkml.kernel.org/r/20251114030028.7035-2-richard.weiyang@gmail.com Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Reviewed-by: Dev Jain <dev.jain@arm.com> Acked-by: David Hildenbrand (Red Hat) <david@kernel.org> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by: Nico Pache <npache@redhat.com> Cc: Barry Song <baohua@kernel.org> Cc: Lance Yang <lance.yang@linux.dev> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.