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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 02/11] media: vsp1: Remove packed attributes from aligned structures
Date: Wed, 14 Mar 2018 09:21:44 +0100	[thread overview]
Message-ID: <CAMuHMdU2XR36gmyuprDFLn5riuST_Av+--cncdOnYdiDsT-9Yw@mail.gmail.com> (raw)
In-Reply-To: <30abb41033b9670c06a54ff484d61d25d3c6e5cd.1520963956.git-series.kieran.bingham+renesas@ideasonboard.com>

On Tue, Mar 13, 2018 at 7:05 PM, Kieran Bingham
<kieran.bingham+renesas@ideasonboard.com> wrote:
> The use of the packed attribute can cause a performance penalty for
> all accesses to the struct members, as the compiler will assume that the
> structure has the potential to have an unaligned base.
>
> These structures are all correctly aligned and contain no holes, thus
> the attribute is redundant and negatively impacts performance, so we
> remove the attributes entirely.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

  reply	other threads:[~2018-03-14  8:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.89a4a5175efbf31441ba717a99b0e3c31088179f.1520963956.git-series.kieran.bingham+renesas@ideasonboard.com>
2018-03-13 18:05 ` [PATCH v2 01/11] media: vsp1: drm: Fix minor grammar error Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 02/11] media: vsp1: Remove packed attributes from aligned structures Kieran Bingham
2018-03-14  8:21   ` Geert Uytterhoeven [this message]
2018-03-13 18:05 ` [PATCH v2 03/11] media: vsp1: Rename dl_child to dl_next Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 04/11] media: vsp1: Remove unused display list structure field Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 05/11] media: vsp1: Clean up DLM objects on error Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 06/11] media: vsp1: Provide VSP1 feature helper macro Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 07/11] media: vsp1: Use header display lists for all WPF outputs linked to the DU Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 08/11] media: vsp1: Add support for extended display list headers Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 09/11] media: vsp1: Provide support for extended command pools Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 10/11] media: vsp1: Support Interlaced display pipelines Kieran Bingham
2018-03-13 18:05 ` [PATCH v2 11/11] drm: rcar-du: Support interlaced video output through vsp1 Kieran Bingham

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