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[ Upstream commit65ac1a60a5] On certain platforms, THP support could not just be validated via the build option CONFIG_TRANSPARENT_HUGEPAGE. Instead has_transparent_hugepage() also needs to be called upon to verify THP runtime support. Otherwise the debug test will just run into unusable THP helpers like in the case of a 4K hash config on powerpc platform [1]. This just moves all pfn_pmd() and pfn_pud() after THP runtime validation with has_transparent_hugepage() which prevents the mentioned problem. [1] https://bugzilla.kernel.org/show_bug.cgi?id=213069 Link: https://lkml.kernel.org/r/1621397588-19211-1-git-send-email-anshuman.khandual@arm.com Fixes:787d563b86("mm/debug_vm_pgtable: fix kernel crash by checking for THP support") Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.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.