netdev - Re: [PATCH V2 net-next 0/2] net: fec: fix TX bandwidth fluctuations

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Date:   Thu, 17 Jun 2021 15:04:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     David Miller <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "frieder.schrempf@...tron.de" <frieder.schrempf@...tron.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 net-next 0/2] net: fec: fix TX bandwidth fluctuations

On Thu, Jun 17, 2021 at 11:40:58AM +0000, Joakim Zhang wrote:
> 
> Hi Andrew,
> 
> > -----Original Message-----
> > From: Andrew Lunn <andrew@...n.ch>
> > Sent: 2021年6月16日 21:06
> > To: Joakim Zhang <qiangqing.zhang@....com>
> > Cc: David Miller <davem@...emloft.net>; kuba@...nel.org;
> > frieder.schrempf@...tron.de; netdev@...r.kernel.org;
> > linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH V2 net-next 0/2] net: fec: fix TX bandwidth fluctuations
> > 
> > > I try below build options, also can't reproduce this issue, so really don't know
> > how to fix it.
> > >
> > > make ARCH=arm64 distclean
> > > make ARCH=arm64 allmodconfig
> > > make -j8 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- W=1 / make -j8
> > ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- W=2 / make -j8
> > ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- W=3
> > >
> > > I saw many unrelated warnings...
> > 
> > Then it could be sparse. Install sparse and use C=1.
> 
> After applying the patch #2, I tried to use C=1 yesterday, I double check it today, still no warnings. Anything I missing?
> 
> $ make -j8 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- W=1,C=1
>   CALL    scripts/atomic/check-atomics.sh
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   CHK     kernel/kheaders_data.tar.xz
>   CC [M]  drivers/net/ethernet/freescale/fec_main.o
>   LD [M]  drivers/net/ethernet/freescale/fec.o
>   MODPOST modules-only.symvers
>   GEN     Module.symvers
>   CC [M]  drivers/net/ethernet/freescale/fec.mod.o
>   LD [M]  drivers/net/ethernet/freescale/fec.ko
> 
> Best Regards,
> Joakim Zhang
> >      Andrew


If you look at
https://patchwork.hopto.org/static/nipa/498729/12315211/build_32bit/stdout

you see:

Kernel: arch/x86/boot/bzImage is ready  (#9396)

So it is building for 32 bit x86. So try

make -j8 ARCH=i386 W=1 C=1

Assuming your host is an x86 machine.

	 Andrew