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[ Upstream commitbf296b3548] Kernel test robot reported build errors (undefined references) that didn't make much sense. After reproducing them, there is also a Kconfig warning that is the root cause of the build errors, so fix that Kconfig problem. Fixes this Kconfig warning: WARNING: unmet direct dependencies detected for CMA Depends on [n]: MMU [=n] Selected by [m]: - DRM_ASPEED_GFX [=m] && HAS_IOMEM [=y] && DRM [=m] && OF [=y] && (COMPILE_TEST [=y] || ARCH_ASPEED) && HAVE_DMA_CONTIGUOUS [=y] and these dependent build errors: (.text+0x10c8c): undefined reference to `start_isolate_page_range' microblaze-linux-ld: (.text+0x10f14): undefined reference to `test_pages_isolated' microblaze-linux-ld: (.text+0x10fd0): undefined reference to `undo_isolate_page_range' Fixes:76356a966e("drm: aspeed: Clean up Kconfig options") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Joel Stanley <joel@jms.id.au> Cc: Joel Stanley <joel@jms.id.au> Cc: Andrew Jeffery <andrew@aj.id.au> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Michal Simek <monstr@monstr.eu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: linux-mm@kvack.org Cc: linux-aspeed@lists.ozlabs.org Cc: linux-arm-kernel@lists.infradead.org Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://patchwork.freedesktop.org/patch/msgid/20201011230131.4922-1-rdunlap@infradead.org Signed-off-by: Joel Stanley <joel@jms.id.au> 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.