linux-kernel - Re: [PATCH] powerpc: define the variable 'uaccess

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Date:   Mon, 15 Mar 2021 10:16:38 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     "heying (H)" <heying24@...wei.com>,
        Cédric Le Goater <clg@...d.org>,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        npiggin@...il.com, dja@...ens.net, akpm@...ux-foundation.org,
        rppt@...nel.org, aneesh.kumar@...ux.ibm.com
Cc:     johnny.chenyi@...wei.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: define the variable 'uaccess_flush' as static



Le 15/03/2021 à 07:51, heying (H) a écrit :
> 
>> I think this is the case also for entry_flush. compiling with W=1 will tell you more.
> 
> When I use these commands:
> 
> make allmodconfig ARCH=powerpc CROSS_COMPILE=powerpc64-linux-gnu-
> make C=2 arch/powerpc/kernel/setup_64.o ARCH=powerpc CROSS_COMPILE=powerpc64-linux-gnu-
> 
> I find warnings as followings:
> 
> arch/powerpc/kernel/setup_64.c:422:6: warning: symbol 'panic_smp_self_stop' was not declared. Should 
> it be static?
> arch/powerpc/kernel/setup_64.c:951:6: warning: symbol 'rfi_flush' was not declared. Should it be static?
> arch/powerpc/kernel/setup_64.c:952:6: warning: symbol 'entry_flush' was not declared. Should it be 
> static?
> arch/powerpc/kernel/setup_64.c:953:6: warning: symbol 'uaccess_flush' was not declared. Should it be 
> static?
> 
> When I use the command "make W=1 arch/powerpc/kernel/setup_64.o ARCH=powerpc 
> CROSS_COMPILE=powerpc64-linux-gnu-", warning becomes this:
> 
> arch/powerpc/kernel/setup_64.c:422:6: warning: no previous prototype for ‘panic_smp_self_stop’ 
> [-Wmissing-prototypes]
>   void panic_smp_self_stop(void)
>        ^~~~~~~~~~~~~~~~~~~
> 
> My sparse tool is the latest one with the version "v0.6.3". So, should I fix all the warnings 
> reported by sparse?

I think W=1 will only report missing function prototypes.

sparse also reports missing variables prototypes so that's better. All should be fixed.

Christophe