Re: [PATCH net-next] net: stmmac: Add support for CBS QDISC

Hi Geert,

On 27-06-2018 15:36, Geert Uytterhoeven wrote:

Hi Jose,

On Wed, Jun 27, 2018 at 4:32 PM Jose Abreu [off-list ref] wrote:

quoted

++ SH Maintainers
++ SH ML

Hi SH Maintainers,

On 27-06-2018 15:15, kbuild test robot wrote:

quoted

Hi Jose,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_0day-2Dci_linux_commits_Jose-2DAbreu_net-2Dstmmac-2DAdd-2Dsupport-2Dfor-2DCBS-2DQDISC_20180627-2D214704&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=YIae3rrFzqYg_5b4eVIAXuyvT_EV0vKACS25rJugux8&s=qW5_vbinGt0OnyDfQ2wtKdb2ZGzCcLwq6Fmlaki61xw&e=
config: sh-allyesconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://urldefense.proofpoint.com/v2/url?u=https-3A__raw.githubusercontent.com_intel_lkp-2Dtests_master_sbin_make.cross&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=YIae3rrFzqYg_5b4eVIAXuyvT_EV0vKACS25rJugux8&s=4nNar4fgVZq0LjrPKIZP30nxVUY4yeu5QeyKbmlsu8A&e= -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sh

All warnings (new ones prefixed by >>):

   In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:174,
                    from include/linux/list.h:9,
                    from include/linux/timer.h:5,
                    from include/linux/workqueue.h:9,
                    from include/net/pkt_cls.h:6,
                    from drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c:7:
   drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c: In function 'tc_setup_cbs':
   include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
     (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
                               ^

quoted

quoted

drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c:325:2: note: in expansion of macro 'do_div'

     do_div(value, speed_div);
     ^~~~~~
   include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
     (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \

I'm not seeing the reason for this warning as I'm using a 64 bit
var. I guess the warning is appearing only because its signed
[see source bellow]. Is this not supported?

No, the first parameter of do_div() must be u64, hence the check to
enforce that.

Hmm ok. I guess I can use two variables then because the only
case value will be negative is with locredit and this does not
need the do_div.

Thanks for the clarification.

Thanks and Best Regards,
Jose Miguel Abreu

Gr{oetje,eeting}s,

                        Geert