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SubjectRe: [PATCH] clk: qcom: ipq4019: fix apss cpu overclocking
On Mon, Jun 8, 2020 at 11:07 AM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> On Mon, Jun 08, 2020 at 10:54:34AM +0200, Robert Marko wrote:
> > On Thu, Jun 4, 2020 at 10:25 PM kernel test robot <lkp@intel.com> wrote:
> > >
> > > Hi Robert,
> > >
> > > I love your patch! Perhaps something to improve:
> > >
> > > [auto build test WARNING on clk/clk-next]
> > > [also build test WARNING on v5.7 next-20200604]
> > > [if your patch is applied to the wrong git tree, please drop us a note to help
> > > improve the system. BTW, we also suggest to use '--base' option to specify the
> > > base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> > >
> > > url: https://github.com/0day-ci/linux/commits/Robert-Marko/clk-qcom-ipq4019-fix-apss-cpu-overclocking/20200605-002859
> > > base: https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
> > > config: x86_64-allyesconfig (attached as .config)
> > > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project ac47588bc4ff5927a01ed6fcd269ce86aba52a7c)
> > > 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 x86_64 cross compiling tool for clang build
> > > # apt-get install binutils-x86-64-linux-gnu
> > > # save the attached .config to linux build tree
> > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
> > >
> > > If you fix the issue, kindly add following tag as appropriate
> > > Reported-by: kernel test robot <lkp@intel.com>
> > >
> > > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> > >
> > > >> drivers/clk/qcom/gcc-ipq4019.c:1247:24: warning: no previous prototype for function 'qcom_find_freq_close' [-Wmissing-prototypes]
> > > const struct freq_tbl *qcom_find_freq_close(const struct freq_tbl *f,
> > > ^
> > > drivers/clk/qcom/gcc-ipq4019.c:1247:7: note: declare 'static' if the function is not intended to be used outside of this translation unit
> > > const struct freq_tbl *qcom_find_freq_close(const struct freq_tbl *f,
> > > ^
> > > static
> > > 1 warning generated.
> > >
> > > vim +/qcom_find_freq_close +1247 drivers/clk/qcom/gcc-ipq4019.c
> > >
> > > 1245
> > > 1246
> > > > 1247 const struct freq_tbl *qcom_find_freq_close(const struct freq_tbl *f,
> > > 1248 unsigned long rate)
> > > 1249 {
> > > 1250 const struct freq_tbl *last = NULL;
> > > 1251
> > > 1252 for ( ; f->freq; f++) {
> > > 1253 if (rate == f->freq)
> > > 1254 return f;
> > > 1255
> > > 1256 if (f->freq > rate) {
> > > 1257 if (!last ||
> > > 1258 (f->freq - rate) < (rate - last->freq))
> > > 1259 return f;
> > > 1260 else
> > > 1261 return last;
> > > 1262 }
> > > 1263 last = f;
> > > 1264 }
> > > 1265
> > > 1266 return last;
> > > 1267 }
> > > 1268
> > >
> > > ---
> > > 0-DAY CI Kernel Test Service, Intel Corporation
> > > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
> >
>
> <moved post to the bottom>
>
> > Sorry for asking, but are these warnings relevant?
> > GCC9.3 does not throw them
> >
> > Regards
> > Robert
> >
>
> It should if you are using make W=1, this is not a clang specific
> warning (it just happens that clang was the compiler for this report).

Thanks, W=1 does indeed show the warning along with a not evaluated return.
>
> It looks like qcom_find_freq_close is only used in
> drivers/clk/qcom/gcc-ipq4019.c, in which case it should be marked
> static.
Thanks, it does indeed solve the warning.
I will send a v2 today.

Regards,
Robert
>
> Cheers,
> Nathan

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