linux-kernel - Re: [PATCH 1/3] powerpc/smp: Parse ibm,thread-groups with multiple properties

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Date:   Wed, 09 Dec 2020 14:59:22 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Anton Blanchard <anton@...abs.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Michael Neuling <mikey@...ling.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] powerpc/smp: Parse ibm,thread-groups with multiple properties

Gautham R Shenoy <ego@...ux.vnet.ibm.com> writes:
> Hello Srikar,
>
> Thanks for taking a look at the patch.
>
> On Mon, Dec 07, 2020 at 05:40:42PM +0530, Srikar Dronamraju wrote:
>> * Gautham R. Shenoy <ego@...ux.vnet.ibm.com> [2020-12-04 10:18:45]:
>> 
>> > From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
>> 
>> <snipped>
>> 
>> > 
>> >  static int parse_thread_groups(struct device_node *dn,
>> > -			       struct thread_groups *tg,
>> > -			       unsigned int property)
>> > +			       struct thread_groups_list *tglp)
>> >  {
>> > -	int i;
>> > -	u32 thread_group_array[3 + MAX_THREAD_LIST_SIZE];
>> > +	int i = 0;
>> > +	u32 *thread_group_array;
>> >  	u32 *thread_list;
>> >  	size_t total_threads;
>> > -	int ret;
>> > +	int ret = 0, count;
>> > +	unsigned int property_idx = 0;
>> 
>> NIT:
>> tglx mentions in one of his recent comments to try keep a reverse fir tree
>> ordering of variables where possible.
>
> I suppose you mean moving the longer local variable declarations to to
> the top and shorter ones to the bottom. Thanks. Will fix this.

Yeah. It's called "reverse christmas tree", that's googleable.

I also prefer that style, it makes the locals visually sit with the
beginning of the function body.

cheers