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Message-ID: <ZNaVYh2qi0VQQKWf@antec>
Date:   Fri, 11 Aug 2023 21:09:06 +0100
From:   Stafford Horne <shorne@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Matt Turner <mattst88@...il.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Brian Cain <bcain@...cinc.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Simek <monstr@...str.eu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        x86@...nel.org, Borislav Petkov <bp@...en8.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-openrisc@...r.kernel.org,
        sparclinux@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Christian Brauner <brauner@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Youling Tang <tangyouling@...ngson.cn>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Xin Li <xin3.li@...el.com>, Nhat Pham <nphamcs@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marc Aurèle La France <tsi@...oix.net>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 16/17] [RFC] arch: turn -Wmissing-prototypes off
 conditionally

On Thu, Aug 10, 2023 at 04:19:34PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
,,, 
> ---
> Below is the full list of warnings I see in defconfig builds for reference, these
> do not need to be part of the changelog.
...
> arch/openrisc/kernel/process.c:100:6: error: no previous prototype for 'arch_cpu_idle' [-Werror=missing-prototypes]
> arch/openrisc/kernel/process.c:240:21: error: no previous prototype for '__switch_to' [-Werror=missing-prototypes]
> arch/openrisc/kernel/ptrace.c:191:17: error: no previous prototype for 'do_syscall_trace_enter' [-Werror=missing-prototypes]
> arch/openrisc/kernel/ptrace.c:210:17: error: no previous prototype for 'do_syscall_trace_leave' [-Werror=missing-prototypes]
> arch/openrisc/kernel/signal.c:227:5: error: no previous prototype for 'do_signal' [-Werror=missing-prototypes]
> arch/openrisc/kernel/signal.c:293:1: error: no previous prototype for 'do_work_pending' [-Werror=missing-prototypes]
> arch/openrisc/kernel/signal.c:68:17: error: no previous prototype for '_sys_rt_sigreturn' [-Werror=missing-prototypes]
> arch/openrisc/kernel/time.c:111:25: error: no previous prototype for 'timer_interrupt' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:146:6: error: no previous prototype for 'nommu_dump_state' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:221:17: error: no previous prototype for 'die' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:239:17: error: no previous prototype for 'unhandled_exception' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:246:17: error: no previous prototype for 'do_fpe_trap' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:268:17: error: no previous prototype for 'do_trap' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:273:17: error: no previous prototype for 'do_unaligned_access' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:286:17: error: no previous prototype for 'do_bus_fault' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:462:17: error: no previous prototype for 'do_illegal_instruction' [-Werror=missing-prototypes]
> arch/openrisc/kernel/traps.c:67:6: error: no previous prototype for 'show_registers' [-Werror=missing-prototypes]
> arch/openrisc/mm/fault.c:44:17: error: no previous prototype for 'do_page_fault' [-Werror=missing-prototypes]
> arch/openrisc/mm/tlb.c:188:13: error: no previous prototype for 'tlb_init' [-Werror=missing-prototypes]

I'll try to get these fixed for 6.6.  I was looking at them recently but did not
actually make any changes and just put on my TODO.  Your series moves it up in
priority and it should be easy to get the fixes out.

...

> diff --git a/init/Kconfig b/init/Kconfig
> index 639e8a3363c30..80cd67c0d7fa4 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -170,6 +170,16 @@ config WERROR
>  
>  	  If in doubt, say Y.
>  
> +config WNO_MISSING_PROTOTYPES
> +	bool "Hide -Wmissing-prototype warnings in arch code"
> +	default WERROR || !COMPILE_TEST
> +	help
> +	  Some architectures have not yet eliminated all warnings for
> +	  missing prototypes in their core code and will produce a lot
> +	  of output for these. Ideally these should all be addresszed

addressed

> +	  by individual bugfix patches, but in the meantime saying 'y'
> +	  will skip that output.
> +
>  config UAPI_HEADER_TEST
>  	bool "Compile test UAPI headers"
>  	depends on HEADERS_INSTALL && CC_CAN_LINK

-Stafford

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