[arm-platforms:hack/m1-pmu 8/8] drivers/perf/apple_m1_cpu_pmu.c:100:32: warning: initializer overrides prior initialization of this subobject
Marc Zyngier
maz at kernel.org
Sun Nov 14 02:10:27 PST 2021
On 2021-11-14 08:25, kernel test robot wrote:
> tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
> hack/m1-pmu
> head: a905c66ae0b391425e9ad7f261ad7b4c33af2c07
> commit: a905c66ae0b391425e9ad7f261ad7b4c33af2c07 [8/8] drivers/perf:
> Add Apple icestorm/firestorm CPU PMU driver
> config: arm64-randconfig-r036-20211114 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project
> c3dddeeafb529e769cde87bd29ef6271ac6bfa5c)
> reproduce (this is a W=1 build):
> wget
> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
> -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install arm64 cross compiling tool for clang build
> # apt-get install binutils-aarch64-linux-gnu
> #
> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?id=a905c66ae0b391425e9ad7f261ad7b4c33af2c07
> git remote add arm-platforms
> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
> git fetch --no-tags arm-platforms hack/m1-pmu
> git checkout a905c66ae0b391425e9ad7f261ad7b4c33af2c07
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1
> ARCH=arm64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
>
> All warnings (new ones prefixed by >>):
>
>>> drivers/perf/apple_m1_cpu_pmu.c:100:32: warning: initializer
>>> overrides prior initialization of this subobject
>>> [-Winitializer-overrides]
> [M1_PMU_PERFCTR_UNKNOWN_01] = BIT(7),
> ^~~~~~
> include/vdso/bits.h:7:19: note: expanded from macro 'BIT'
> #define BIT(nr) (UL(1) << (nr))
> ^~~~~~~~~~~~~~~
> drivers/perf/apple_m1_cpu_pmu.c:99:32: note: previous initialization
> is here
> [0 ... M1_PMU_PERFCTR_LAST] = ANY_BUT_0_1,
> ^~~~~~~~~~~
Oh please, not that thing again. I've commented on this many times,
and this warning is just bogus. Initialisation override is a necessity,
and working around this warning leads to something that is far less
maintainable, and thus more *dangerous* than this.
I really wish this warning was simply turned off, because it only
leads to the robot emails to be ignored do to the number of false
positives.
M.
--
Jazz is not dead. It just smells funny...
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