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[ Upstream commitbb297bb2de] When CONFIG_HUGETLB_PAGE is set but not CONFIG_HUGETLBFS, the following build failure is encoutered: In file included from arch/powerpc/mm/fault.c:33:0: include/linux/hugetlb.h: In function 'hstate_inode': include/linux/hugetlb.h:477:9: error: implicit declaration of function 'HUGETLBFS_SB' [-Werror=implicit-function-declaration] return HUGETLBFS_SB(i->i_sb)->hstate; ^ include/linux/hugetlb.h:477:30: error: invalid type argument of '->' (have 'int') return HUGETLBFS_SB(i->i_sb)->hstate; ^ Gate hstate_inode() with CONFIG_HUGETLBFS instead of CONFIG_HUGETLB_PAGE. Fixes:a137e1cc6d("hugetlbfs: per mount huge page sizes") Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Baoquan He <bhe@redhat.com> Cc: Nishanth Aravamudan <nacc@us.ibm.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Adam Litke <agl@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Link: http://lkml.kernel.org/r/7e8c3a3c9a587b9cd8a2f146df32a421b961f3a2.1584432148.git.christophe.leroy@c-s.fr Link: https://patchwork.ozlabs.org/patch/1255548/#2386036 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.