linux-kernel - Re: [PATCH v2 2/8] earlycon: simplify earlycon-table implementation

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Message-ID: <X8pBwTl7nZoOQ18m@localhost>
Date:   Fri, 4 Dec 2020 15:03:45 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jessica Yu <jeyu@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Frank Rowand <frowand.list@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        David Miller <davem@...emloft.net>,
        Jakub Jelinek <jakub@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Kurtz <djkurtz@...omium.org>,
        linux-arch@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v2 2/8] earlycon: simplify earlycon-table implementation

Greg,

On Mon, Nov 23, 2020 at 11:23:13AM +0100, Johan Hovold wrote:
> Instead of using the array-of-pointers trick to avoid having gcc mess up
> the earlycon array stride, specify type alignment when declaring entries
> to prevent gcc from increasing alignment.
> 
> This is essentially an alternative (one-line) fix to the problem
> addressed by commit dd709e72cb93 ("earlycon: Use a pointer table to fix
> __earlycon_table stride").
> 
> gcc can increase the alignment of larger objects with static extent as
> an optimisation, but this can be suppressed by using the aligned
> attribute when declaring variables.
> 
> Note that we have been relying on this behaviour for kernel parameters
> for 16 years and it indeed hasn't changed since the introduction of the
> aligned attribute in gcc-3.1.
> 
> Signed-off-by: Johan Hovold <johan@...nel.org>

Could you pick this one up for 5.11?

Johan