linux-hardening - Re: [PATCH] drm/i915: Prefer struct

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Date:   Sat, 30 Oct 2021 09:51:50 +0200
From:   Len Baker <len.baker@....com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Len Baker <len.baker@....com>, Daniel Vetter <daniel@...ll.ch>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Prefer struct_size over open coded arithmetic

Hi,

On Wed, Oct 27, 2021 at 06:06:28PM +0300, Jani Nikula wrote:
> On Sat, 23 Oct 2021, Len Baker <len.baker@....com> wrote:
> > Sorry, but I'm missing something here. In linux-next this is the commit
> > history of include/linux/stddef.h file:
> >
> > 3080ea5553cc stddef: Introduce DECLARE_FLEX_ARRAY() helper
> > 50d7bd38c3aa stddef: Introduce struct_group() helper macro
> > e7f18c22e6be stddef: Fix kerndoc for sizeof_field() and offsetofend()
> > 4229a470175b stddef.h: Introduce sizeof_field()
> > ...
> >
> > But in drm-tip this is the commit history:
> >
> > 4229a470175b stddef.h: Introduce sizeof_field()
> > ...
> >
> > For this patch the DECLARE_FLEX_ARRAY() helper is needed. But the build
> > fails due to the last tree commits for stddef.h file are not present.
> > So, if I understand correctly, drm-tip is not up to date with linux-next.
>
> linux-next is an ephemeral integration branch for most arch, subsystem
> and driver -next branches.
>
> drm-tip is an ephemeral integration branch for drm subsystem and driver
> -next branches.
>
> They contain different sets of branches. They are constantly
> rebuilt. They are not the end result or end goal.
>
> If a problem (or a solution, for that matter) only exists in the merge
> of some of those branches, you can't actually fix it until such a merge
> exists somewhere more permanent than an ephemeral integration branch.

Ok, understood. Thanks for the clarification.

Regards,
Len