linux-kernel - Re: [PATCH 2/2] powerpc: make 'boot_text

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Date:   Fri, 9 Apr 2021 07:02:20 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Yu Kuai <yukuai3@...wei.com>, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH 2/2] powerpc: make 'boot_text_mapped' static

Hi!

On Thu, Apr 08, 2021 at 07:04:35AM +0200, Christophe Leroy wrote:
> Le 08/04/2021 à 03:18, Yu Kuai a écrit :
> >-int boot_text_mapped __force_data = 0;
> >+static int boot_text_mapped __force_data;
> 
> Are you sure the initialisation to 0 can be removed ? Usually 
> initialisation to 0 is not needed because not initialised variables go in 
> the BSS section which is zeroed at startup. But here the variable is 
> flagged with __force_data so it is not going in the BSS section.

Any non-automatic (i.e. function-scope, not static) variable is
initialised to 0.  See e.g. C11 6.7.9/10 (this has been like that since
times immemorial, C90 anyway).


Segher