From: Catalin Marinas <catalin.marinas@arm.com>
To: kernel test robot <lkp@intel.com>
Cc: Ionela Voinescu <ionela.voinescu@arm.com>,
kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: arch/arm64/kernel/topology.c:367:22: sparse: sparse: dereference of noderef expression
Date: Fri, 18 Dec 2020 10:44:10 +0000 [thread overview]
Message-ID: <20201218104410.GB5258@gaia> (raw)
In-Reply-To: <202012180512.hxAiUO00-lkp@intel.com>
On Fri, Dec 18, 2020 at 05:00:16AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 74f602dc96dd854c7b2034947798c1e2a6b84066
> commit: 68c5debcc06d6d24f15dbf978780fc5efc147d5e arm64: implement CPPC FFH support using AMUs
> date: 5 weeks ago
> config: arm64-randconfig-s032-20201217 (attached as .config)
> compiler: aarch64-linux-gcc (GCC) 9.3.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # apt-get install sparse
> # sparse version: v0.6.3-184-g1b896707-dirty
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=68c5debcc06d6d24f15dbf978780fc5efc147d5e
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout 68c5debcc06d6d24f15dbf978780fc5efc147d5e
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
>
> "sparse warnings: (new ones prefixed by >>)"
> >> arch/arm64/kernel/topology.c:367:22: sparse: sparse: dereference of noderef expression
>
> vim +367 arch/arm64/kernel/topology.c
>
> 362
> 363 int cpc_read_ffh(int cpu, struct cpc_reg *reg, u64 *val)
> 364 {
> 365 int ret = -EOPNOTSUPP;
> 366
> > 367 switch ((u64)reg->address) {
That's not a dereference but I guess sparse complains of dropping the
__iomem. We could change the cast to (__force u64) to silence sparse.
Thanks for the report.
--
Catalin
next prev parent reply other threads:[~2020-12-18 10:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-17 21:00 arch/arm64/kernel/topology.c:367:22: sparse: sparse: dereference of noderef expression kernel test robot
2020-12-18 10:44 ` Catalin Marinas [this message]
2021-01-06 15:07 ` Ionela Voinescu
2021-01-06 15:21 ` Catalin Marinas
2021-01-06 15:52 ` Ionela Voinescu
2021-01-06 16:13 ` Al Viro
2021-01-06 16:47 ` Ionela Voinescu
2021-01-06 17:47 ` Al Viro
2021-01-06 20:12 ` Ionela Voinescu
2021-01-06 20:46 ` Al Viro
-- strict thread matches above, loose matches on Subject: below --
2021-01-06 5:50 kernel test robot
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