linux-kernel - Re: [PATCH v7 3/6] powerpc/perf: consolidate read_user_stack

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Date:   Mon, 2 Sep 2019 10:26:53 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Breno Leitao <leitao@...ian.org>,
        Michael Neuling <mikey@...ling.org>,
        Diana Craciun <diana.craciun@....com>,
        Firoz Khan <firoz.khan@...aro.org>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Joel Stanley <joel@....id.au>, Arnd Bergmann <arnd@...db.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 3/6] powerpc/perf: consolidate read_user_stack_32

On Mon, 02 Sep 2019 14:01:17 +1000
Michael Ellerman <mpe@...erman.id.au> wrote:

> Michael Ellerman <mpe@...erman.id.au> writes:
> > Michal Suchanek <msuchanek@...e.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?

To make this patch readable.

Thanks

Michal