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7fd5995228
[ Upstream commit bd93f003b7462ae39a43c531abca37fe7073b866 ]
Clang normally does not warn about certain issues in inline functions when
it only happens in an eliminated code path. However if something else
goes wrong, it does tend to complain about the definition of hweight_long()
on 32-bit targets:
include/linux/bitops.h:75:41: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
^~~~~~~~~~~~
include/asm-generic/bitops/const_hweight.h:29:49: note: expanded from macro 'hweight64'
define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w))
^~~~~~~~~~~~~~~~~~~~
include/asm-generic/bitops/const_hweight.h:21:76: note: expanded from macro '__const_hweight64'
define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32))
^ ~~
include/asm-generic/bitops/const_hweight.h:20:49: note: expanded from macro '__const_hweight32'
define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16))
^
include/asm-generic/bitops/const_hweight.h:19:72: note: expanded from macro '__const_hweight16'
define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 ))
^
include/asm-generic/bitops/const_hweight.h:12:9: note: expanded from macro '__const_hweight8'
(!!((w) & (1ULL << 2))) + \
Adding an explicit cast to __u64 avoids that warning and makes it easier
to read other output.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Link: http://lkml.kernel.org/r/20200505135513.65265-1-arnd@arndb.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@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.