netdev - Re: [PATCH] wireless: remove unneeded break

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Date:   Mon, 19 Oct 2020 09:20:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Christian Lamparter <chunkeey@...il.com>, trix@...hat.com,
        kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        ath9k-devel@....qualcomm.com, johannes.berg@...el.com,
        emmanuel.grumbach@...el.com, luciano.coelho@...el.com,
        linuxwifi@...el.com, chunkeey@...glemail.com, pkshih@...ltek.com,
        sara.sharon@...el.com, tova.mussai@...el.com,
        nathan.errera@...el.com, lior2.cohen@...el.com, john@...ozen.org,
        shaul.triebitz@...el.com, shahar.s.matityahu@...el.com,
        Larry.Finger@...inger.net, zhengbin13@...wei.com,
        christophe.jaillet@...adoo.fr, yanaijie@...wei.com,
        saurav.girepunje@...il.com
Cc:     ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] wireless: remove unneeded break

On Mon, 2020-10-19 at 10:54 -0500, Gustavo A. R. Silva wrote:
> On 10/19/20 10:21, Joe Perches wrote:
> > On Mon, 2020-10-19 at 17:14 +0200, Christian Lamparter wrote:
> > > On 19/10/2020 17:05, trix@...hat.com wrote:
> > > > From: Tom Rix <trix@...hat.com>
> > > > 
> > > > A break is not needed if it is preceded by a return or goto
> > > > 
> > > > Signed-off-by: Tom Rix <trix@...hat.com>
> > > > diff --git a/drivers/net/wireless/intersil/p54/eeprom.c b/drivers/net/wireless/intersil/p54/eeprom.c
[]
> > > > @@ -870,7 +870,6 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
> > > >   			} else {
> > > >   				goto good_eeprom;
> > > >   			}
> > > > -			break;
> > > Won't the compiler (gcc) now complain about a missing fallthrough annotation?
> 
> Clang would definitely complain about this.

As far as I can tell, clang 10.0.0 doesn't complain.

This compiles without fallthrough complaint

from make V=1 W=123 CC=clang drivers/net/wireless/intersil/p54/eeprom.o
with -Wimplicit-fallthrough added

$ clang -Wp,-MMD,drivers/net/wireless/intersil/p54/.eeprom.o.d  -nostdinc -isystem /usr/local/lib/clang/10.0.0/include -I./arch/x86/include -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -Qunused-arguments -DKBUILD_EXTRA_WARN1 -DKBUILD_EXTRA_WARN2 -DKBUILD_EXTRA_WARN3 -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Wno-format-security -std=gnu89 -no-integrated-as -Werror=unknown-warning-option -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -m64 -mno-80387 -mstack-alignment=8 -mtune=generic -mno-red-zone -mcmodel=kernel -DCONFIG_X86_X32_ABI -Wno-sign-compare -fno-asynchronous-unwind-tables -mretpoline-external-thunk -fno-delete-null-pointer-checks -Wno-address-of-packed-member -O2 -Wframe-larger-than=2048 -fstack-protector-strong -Wno-format-invalid-specifier -Wno-gnu -mno-global-merge -Wno-unused-const-variable -ftrivial-auto-var-init=pattern -pg -mfentry -DCC_USING_FENTRY -falign-functions=32 -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wno-array-bounds -fno-strict-overflow -fno-stack-check -Werror=date-time -Werror=incompatible-pointer-types -fcf-protection=none -Wextra -Wunused -Wno-unused-parameter -Wmissing-declarations -Wmissing-format-attribute -Wmissing-prototypes -Wold-style-definition -Wmissing-include-dirs -Wunused-const-variable -Wno-missing-field-initializers -Wno-sign-compare -Wno-type-limits -Wcast-align -Wdisabled-optimization -Wnested-externs -Wshadow -Wmissing-field-initializers -Wtype-limits -Wunused-macros -Wbad-function-cast -Wcast-qual -Wconversion -Wpacked -Wpadded -Wpointer-arith -Wredundant-decls -Wsign-compare -Wswitch-default     -fsanitize=kernel-address -mllvm -asan-mapping-offset=0xdffffc0000000000  -mllvm -asan-globals=1  -mllvm -asan-instrumentation-with-call-threshold=0  -mllvm -asan-stack=0   --param asan-instrument-allocas=1   -fsanitize-coverage=trace-pc -fsanitize-coverage=trace-cmp -Wimplicit-fallthrough    -DKBUILD_MODFILE='"drivers/net/wireless/intersil/p54/p54common"' -DKBUILD_BASENAME='"eeprom"' -DKBUILD_MODNAME='"p54common"' -c -o drivers/net/wireless/intersil/p54/eeprom.o drivers/net/wireless/intersil/p54/eeprom.c