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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Michal Suchanek <msuchanek@suse.de>, linuxppc-dev@lists.ozlabs.org
Cc:     Michal Suchanek <msuchanek@suse.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Breno Leitao <leitao@debian.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Firoz Khan <firoz.khan@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Joel Stanley <joel@jms.id.au>,
        Hari Bathini <hbathini@linux.ibm.com>,
        Michael Neuling <mikey@neuling.org>,
        Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
        Russell Currey <ruscur@russell.cc>,
        Diana Craciun <diana.craciun@nxp.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        David Hildenbrand <david@redhat.com>,
        Allison Randal <allison@lohutok.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v7 3/6] powerpc/perf: consolidate read_user_stack_32
In-Reply-To: <87a7bntkum.fsf@mpe.ellerman.id.au>
References: <cover.1567198491.git.msuchanek@suse.de> <ea3783a1640b707ef9ce4740562850ef1152829b.1567198491.git.msuchanek@suse.de> <87a7bntkum.fsf@mpe.ellerman.id.au>
Date:   Mon, 02 Sep 2019 14:01:17 +1000
Message-ID: <877e6rtkhe.fsf@mpe.ellerman.id.au>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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Michael Ellerman <mpe@ellerman.id.au> writes:
> Michal Suchanek <msuchanek@suse.de> writes:
...
>> @@ -295,6 +279,12 @@ static inline int current_is_64bit(void)
>>  }
>>  
>>  #else  /* CONFIG_PPC64 */
>> +static int read_user_stack_slow(void __user *ptr, void *buf, int nb)
>> +{
>> +	return 0;
>> +}
>> +#endif /* CONFIG_PPC64 */
>
> Ending the PPC64 else case here, and then restarting it below with an
> ifndef means we end up with two parts of the file that define 32-bit
> code, with a common chunk in the middle, which I dislike.
>
> I'd rather you add the empty read_user_stack_slow() in the existing
> #else section and then move read_user_stack_32() below the whole ifdef
> PPC64/else/endif section.
>
> Is there some reason that doesn't work?

Gah, I missed that you split the whole file later in the series. Any
reason you did it in two steps rather than moving patch 6 earlier in the
series?

cheers