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The kernel test robot reports that moving READ_ONCE() out into its own header breaks a W=1 build for parisc, which is relying on the definition of compiletime_assert() being available: | In file included from ./arch/parisc/include/generated/asm/rwonce.h:1, | from ./include/asm-generic/barrier.h:16, | from ./arch/parisc/include/asm/barrier.h:29, | from ./arch/parisc/include/asm/atomic.h:11, | from ./include/linux/atomic.h:7, | from kernel/locking/percpu-rwsem.c:2: | ./arch/parisc/include/asm/atomic.h: In function 'atomic_read': | ./include/asm-generic/rwonce.h:36:2: error: implicit declaration of function 'compiletime_assert' [-Werror=implicit-function-declaration] | 36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ | | ^~~~~~~~~~~~~~~~~~ | ./include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type' | 49 | compiletime_assert_rwonce_type(x); \ | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ./arch/parisc/include/asm/atomic.h:73:9: note: in expansion of macro 'READ_ONCE' | 73 | return READ_ONCE((v)->counter); | | ^~~~~~~~~ Move these macros into compiler_types.h, so that they are available to READ_ONCE() and friends. Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2020-July/587094.html Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Will Deacon <will@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.