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Date: Wed, 18 May 2022 08:33:44 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: Guo Zhengkui <guozhengkui@...o.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Colin Ian King <colin.king@...el.com>, Jiasheng Jiang <jiasheng@...as.ac.cn>, "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, zhengkui_guo@...look.com Subject: Re: [PATCH linux-next] net: smc911x: replace ternary operator with min() On Wed, 18 May 2022 11:07:08 +0200 Geert Uytterhoeven wrote: > On Mon, May 16, 2022 at 10:36 PM Guo Zhengkui <guozhengkui@...o.com> wrote: > > Fix the following coccicheck warning: > > > > drivers/net/ethernet/smsc/smc911x.c:483:20-22: WARNING opportunity for min() > > > > Signed-off-by: Guo Zhengkui <guozhengkui@...o.com> > > Thanks for your patch, which is now commit 5ff0348b7f755aac ("net: > smc911x: replace ternary operator with min()") in net-next/master. > > > --- a/drivers/net/ethernet/smsc/smc911x.c > > +++ b/drivers/net/ethernet/smsc/smc911x.c > > @@ -480,7 +480,7 @@ static void smc911x_hardware_send_pkt(struct net_device *dev) > > SMC_SET_TX_FIFO(lp, cmdB); > > > > DBG(SMC_DEBUG_PKTS, dev, "Transmitted packet\n"); > > - PRINT_PKT(buf, len <= 64 ? len : 64); > > + PRINT_PKT(buf, min(len, 64)); > > Unfortunately you forgot to test-compile this with > ENABLE_SMC_DEBUG_PKTS=1, which triggers: > > drivers/net/ethernet/smsc/smc911x.c: In function > ‘smc911x_hardware_send_pkt’: > include/linux/minmax.h:20:28: error: comparison of distinct > pointer types lacks a cast [-Werror] > 20 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) > | ^~ > drivers/net/ethernet/smsc/smc911x.c:483:17: note: in expansion > of macro ‘min’ > 483 | PRINT_PKT(buf, min(len, 64)); > > "len" is "unsigned int", while "64" is "(signed) int". Ah, damn. I did double check that the build test actually compiles smc911x.o 'cause this patch looked suspicious. Didn't realize that more than allmodconfig is needed to trigger this :/ How do you enable ENABLE_SMC_DEBUG_PKTS? You edit the source? > I have sent a fix > https://lore.kernel.org/r/ca032d4122fc70d3a56a524e5944a8eff9a329e8.1652864652.git.geert+renesas@glider.be/ Thanks a lot!
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