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262e4c3893
Currently arch/mips/include/asm/io.h provides 64b memory accessor functions such as readq & writeq even on MIPS32 platforms where those accessors cannot actually perform a 64b memory access. They instead BUG(). This is unfortunate for drivers which either #ifdef on the presence of these accessors, or can function with non-atomic implementations of them found in either linux/io-64-nonatomic-lo-hi.h or linux/io-64-nonatomic-hi-lo.h. As such we're preparing to remove the definitions of these 64b accessor functions for MIPS32 kernels. In preparation for this, include linux/io-64-nonatomic-lo-hi.h in defza.c in order to provide a non-atomic implementation of the readq_relaxed & writeq_relaxed functions that are used by this code. In practice this will have no runtime effect, since use of the 64b accessor functions is conditional upon sizeof(unsigned long) == 8, ie. upon CONFIG_64BIT=y. This means the calls to these non-atomic readq & writeq implementations will be optimized out anyway, but we need their definitions to keep the compiler happy. For 64bit kernels using this code this change should also have no effect because asm/io.h will continue to provide the definitions of readq_relaxed & writeq_relaxed, which linux/io-64-nonatomic-lo-hi.h checks for before defining itself. Signed-off-by: Paul Burton <paul.burton@mips.com> Acked-by: Maciej W. Rozycki <macro@linux-mips.org> Acked-by: David S. Miller <davem@davemloft.net> Cc: Serge Semin <Sergey.Semin@t-platforms.ru> Cc: netdev@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org |
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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.