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

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Message-ID: <87ee86h5hn.fsf@intel.com>
Date:   Wed, 27 Oct 2021 18:06:28 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Len Baker <len.baker@....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

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.


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center