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[ Upstream commit 97715058b7 ]
When CONFIG_NO_AUTO_INLINE was present in linux-next (which added
'-fno-inline-functions' to KBUILD_CFLAGS), an allyesconfig build with
Clang failed at the modpost stage:
ERROR: "is_broadcast_mac_addr" [drivers/staging/rtl8723bs/r8723bs.ko] undefined!
ERROR: "is_zero_mac_addr" [drivers/staging/rtl8723bs/r8723bs.ko] undefined!
ERROR: "is_multicast_mac_addr" [drivers/staging/rtl8723bs/r8723bs.ko] undefined!
These functions were marked as extern inline, meaning that if inlining
doesn't happen, the function will be undefined, as it is above.
This happens to work with GCC because the '-fno-inline-functions' option
respects the __inline attribute so all instances of these functions are
inlined as expected and the definition doesn't actually matter. However,
with Clang and '-fno-inline-functions', a function has to be marked with
the __always_inline attribute to be considered for inlining, which none
of these functions are. Clang tries to find the symbol definition
elsewhere as it was told and fails, which trickles down to modpost.
To make sure that this code compiles regardless of compiler and make the
intention of the code clearer, use 'static' to ensure these functions
are always defined, regardless of inlining. Additionally, silence a
checkpatch warning by switching from '__inline' to 'inline'.
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.