linux-kernel - Re: [PATCH v2 0/8] powerpc/85xx: p2020: Create one unified machine description

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Message-ID: <ceb80ec7-57cc-ba39-88f9-72fc8fa67930@csgroup.eu>
Date:   Mon, 13 Feb 2023 19:58:15 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Pali Rohár <pali@...nel.org>
CC:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Scott Wood <oss@...error.net>, Sinan Akman <sinan@...teme.com>,
        Martin Kennedy <hurricos@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/8] powerpc/85xx: p2020: Create one unified machine
 description

Le 09/02/2023 à 01:15, Pali Rohár a écrit :
>>
>> This patch moves all p2020 boards from mpc85xx_rdb.c and mpc85xx_ds.c
>> files into new p2020.c file, and plus it copies all helper functions
>> which p2020 boards requires. This patch does not introduce any new code
>> or functional change. It should be really plain copy/move.

Yes after looking into it in more details, it is exactly that. You 
copied all helper functions but this is not said in the commit message.
I think it should be said, and more important it should be explained why.
Because this is exactly what I was not understanding, why I couldn't see 
all moved functions: just because many of them were not moved but copied.

In the two first pages you made some function static, and then you 
duplicated it. Why ? Why not keep it global and just use it from one 
place to the other ?

Because after patch 3 we have:

arch/powerpc/platforms/85xx/mpc85xx_rdb.c:static void __init 
mpc85xx_rdb_pic_init(void)
arch/powerpc/platforms/85xx/p2020.c:static void __init 
mpc85xx_rdb_pic_init(void)

arch/powerpc/platforms/85xx/mpc85xx_ds.c:static void __init 
mpc85xx_ds_pic_init(void)
arch/powerpc/platforms/85xx/p2020.c:static void __init 
mpc85xx_ds_pic_init(void)

Why not just drop patches 1 and 2 and keep those two functions and all 
the other common functions like mpc85xx_8259_cascade() 
mpc85xx_ds_uli_init() and a lot more  in a separate common file ?

Christophe