mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-14 14:42:34 -04:00
4850f158c0
In a later commit we'll use dma_alloc_noncoherent() which isn't stubbed out for builds without CONFIG_DMA_ENGINE and results in the following build error: spi-fsl-dspi.c:(.text+0x644): undefined reference to `dma_free_pages' m68k-linux-ld: spi-fsl-dspi.c:(.text+0x67a): undefined reference to `dma_free_pages' To continue to support devices that only need XSPI mode and so that randconfig builds work, stub out DMA functionality in the DSPI driver. Although older parts of the DMA API have their own stubs, it's intentional that newer parts don't follow the same pattern. Therefore individual drivers should not compile in calls unless CONFIG_DMA_ENGINE is set. Link: https://lore.kernel.org/oe-kbuild-all/202506160036.t9VDxF6p-lkp@intel.com/ Signed-off-by: James Clark <james.clark@linaro.org> Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Message-ID: <20250902-james-nxp-spi-dma-v6-3-f7aa2c5e56e2@linaro.org> Signed-off-by: Mark Brown <broonie@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 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.