linux-kernel - Re: [PATCH] macintosh: no need to initilise statics to 0

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Date:   Tue, 17 Aug 2021 11:05:24 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Jason Wang <wangborong@...rlc.com>, benh@...nel.crashing.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com
Subject: Re: [PATCH] macintosh: no need to initilise statics to 0

On Tue, 2021-08-17 at 13:59 +0200, Christophe Leroy wrote:
> 
> Le 17/08/2021 à 13:51, Jason Wang a écrit :
> > Global static variables dont need to be initialised to 0. Because
> > the compiler will initilise them.
> 
> It is not the compiler, it is the Kernel. It is done here:
> 
> https://elixir.bootlin.com/linux/v5.14-rc6/source/arch/powerpc/kernel/early_32.c

I don't know why that's done generally.

>From memory, it's also required by the c spec unless it's for a union
where the first union member is smaller in size than other members.