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Building perf for MIPS failed after9f79b8b723("uapi: simplify __ARCH_FLOCK{,64}_PAD a little") with the following error: CC /home/fainelli/work/buildroot/output/bmips/build/linux-custom/tools/perf/trace/beauty/fcntl.o In file included from ../../../../host/mipsel-buildroot-linux-gnu/sysroot/usr/include/asm/fcntl.h:77, from ../include/uapi/linux/fcntl.h:5, from trace/beauty/fcntl.c:10: ../include/uapi/asm-generic/fcntl.h:188:8: error: redefinition of 'struct flock' struct flock { ^~~~~ In file included from ../include/uapi/linux/fcntl.h:5, from trace/beauty/fcntl.c:10: ../../../../host/mipsel-buildroot-linux-gnu/sysroot/usr/include/asm/fcntl.h:63:8: note: originally defined here struct flock { ^~~~~ This is due to the local copy under tools/include/uapi/asm-generic/fcntl.h including the toolchain's kernel headers which already define 'struct flock' and define HAVE_ARCH_STRUCT_FLOCK to future inclusions make a decision as to whether re-defining 'struct flock' is appropriate or not. Make sure what do not re-define 'struct flock' when HAVE_ARCH_STRUCT_FLOCK is already defined. Fixes:9f79b8b723("uapi: simplify __ARCH_FLOCK{,64}_PAD a little") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> [arnd: sync with include/uapi/asm-generic/fcntl.h as well] Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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.