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8f5c9037a5
If the cache line size is greater than ARCH_DMA_MINALIGN (128), the warning shows and it's tainted as TAINT_CPU_OUT_OF_SPEC. However, it's not good because as discussed in the thread [1], the cpu cache line size will be problem only on non-coherent devices. Since the coherent flag is already introduced to struct device, show the warning only if the device is non-coherent device and ARCH_DMA_MINALIGN is smaller than the cpu cache size. [1] https://lore.kernel.org/linux-arm-kernel/20180514145703.celnlobzn3uh5tc2@localhost/ Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Tested-by: Zhang Lei <zhang.lei@jp.fujitsu.com> [catalin.marinas@arm.com: removed 'if' block for WARN_TAINT] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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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.