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When the pgtable is NULL in the set_huge_zero_page(), we should not increment the count of PTE page table pages by calling mm_inc_nr_ptes(). Otherwise we may receive the following warning when the mm exits: BUG: non-zero pgtables_bytes on freeing mm Now we can't observe the above warning since only do_huge_pmd_anonymous_page() invokes set_huge_zero_page() and the pgtable can not be NULL. Therefore, instead of moving mm_inc_nr_ptes() to the non-NULL branch of pgtable, it is better to remove the redundant pgtable check directly. Link: https://lkml.kernel.org/r/20220818082748.40021-1-zhengqi.arch@bytedance.com Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Mike Kravetz <mike.kravetz@oracle.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 Restructured Text 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.