linux-kernel - Re: [PATCH 2/3] staging: r8188eu: Makefile: don't overwrite global settings

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Date:   Sun, 17 Oct 2021 19:46:21 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Michael Straube <straube.linux@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] staging: r8188eu: Makefile: don't overwrite global
 settings

Thus wrote Michael Straube (straube.linux@...il.com):

> On 10/16/21 19:35, Martin Kaiser wrote:
> > Remove settings from the Makefile that are set by higher-level Makefiles.

> > Some of those settings might have been useful when the driver was
> > maintained out of tree.

> > Signed-off-by: Martin Kaiser <martin@...ser.cx>
> > ---
> >   drivers/staging/r8188eu/Makefile | 14 --------------
> >   1 file changed, 14 deletions(-)

> > diff --git a/drivers/staging/r8188eu/Makefile b/drivers/staging/r8188eu/Makefile
> > index fccf7e6d1520..8294fb69ecf9 100644
> > --- a/drivers/staging/r8188eu/Makefile
> > +++ b/drivers/staging/r8188eu/Makefile
> > @@ -1,8 +1,3 @@
> > -SHELL := /bin/bash
> > -EXTRA_CFLAGS += $(USER_EXTRA_CFLAGS)
> > -EXTRA_CFLAGS += -O1
> > -
> > -ccflags-y += -D__CHECK_ENDIAN__
> >   OUTSRC_FILES :=				\
> >   		hal/HalHWImg8188E_MAC.o	\
> > @@ -46,15 +41,6 @@ _OS_INTFS_FILES :=				\
> >   _HAL_INTFS_FILES += $(OUTSRC_FILES)
> > -SUBARCH := $(shell uname -m | sed -e "s/i.86/i386/; s/ppc.*/powerpc/; s/armv.l/arm/; s/aarch64/arm64/;")
> > -
> > -ARCH ?= $(SUBARCH)
> > -CROSS_COMPILE ?=
> > -KVER  ?= $(if $(KERNELRELEASE),$(KERNELRELEASE),$(shell uname -r))
> > -KSRC ?= $(if $(KERNEL_SRC),$(KERNEL_SRC),/lib/modules/$(KVER)/build)
> > -MODDESTDIR := /lib/modules/$(KVER)/kernel/drivers/net/wireless
> > -INSTALL_PREFIX :=
> > -
> >   rtk_core :=				\
> >   		core/rtw_ap.o		\
> >   		core/rtw_br_ext.o	\


> Hi Martin, this patch introduces a GCC warning on my system.

> drivers/staging/r8188eu/os_dep/ioctl_linux.c: In function
> 'rtw_wx_set_enc_ext':
> drivers/staging/r8188eu/os_dep/ioctl_linux.c:1929:9: warning: 'strncpy'
> specified bound 16 equals destination size [-Wstringop-truncation]
>  1929 |         strncpy((char *)param->u.crypt.alg, alg_name,
> IEEE_CRYPT_ALG_NAME_LEN);
>       |


Hi Michael,

thanks for reporting this. So far, I can't reproduce the warning, even
if I enable -Wstringop-truncation explicitly. I tried this with gcc
8.3.0 (Debian buster) on x86_64.

Could you send me your complete compiler command line for this file
(make V=1)?

Maybe it's not ok to delete the EXTRA_CFLAGS. I guessed that the
optimisation level would be set by a higher-level Makefile...

Thanks,
Martin