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

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Date:   Tue, 19 Oct 2021 00:33:04 +0200
From:   Michael Straube <straube.linux@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Martin Kaiser <martin@...ser.cx>,
        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

On 10/18/21 16:52, Greg Kroah-Hartman wrote:
> On Sun, Oct 17, 2021 at 10:46:11PM +0200, Michael Straube wrote:
>> On 10/17/21 19:46, Martin Kaiser wrote:
>>> 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.
>>
>> Hi Martin,
>>
>> probably only newer gcc versions produce this warning. On my system
>> the gcc version is 11.2.1 (openSUSE Tumbleweed).
> 
> I have gcc 11.1.0 here and I can not duplicate this warning.  And it
> looks like the code matches other places in the kernel where this
> happens, so I'll just take this for now and see if someone wants to send
> me a real fix for it, as it is independent of this Makefile change.
> 
> thanks,
> 
> greg k-h
> 

I totally forgot that I have an alias for building that sets W=1.
That's why I got this warning...

However, I sent a patch to fix it.

Thanks,
Michael