linux-kernel - Re: [PATCH] drm/amd/display: include linux/slab.h where needed

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Date:   Tue, 10 Dec 2019 21:51:49 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Eric Yang <Eric.Yang2@....com>, Roman Li <Roman.Li@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Strauss <michael.strauss@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>
Subject: Re: [PATCH] drm/amd/display: include linux/slab.h where needed

On Tue, Dec 10, 2019 at 9:30 PM Kazlauskas, Nicholas
<nicholas.kazlauskas@....com> wrote:
>
> On 2019-12-10 2:59 p.m., Arnd Bergmann wrote:
> > Calling kzalloc() and related functions requires the
> > linux/slab.h header to be included:
> >
> > drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.c: In function 'dcn21_ipp_create':
> > drivers/gpu/drm/amd/amdgpu/../display/dc/dcn21/dcn21_resource.c:679:3: error: implicit declaration of function 'kzalloc'; did you mean 'd_alloc'? [-Werror=implicit-function-declaration]
> >     kzalloc(sizeof(struct dcn10_ipp), GFP_KERNEL);
> >
> > A lot of other headers also miss a direct include in this file,
> > but this is the only one that causes a problem for now.
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> What version of the kernel are you building?

This is v5.5-rc1, plus some local patches.

> We have:
>
> #include <linux/slab.h>
>
> in os_types.h which gets included as part of this file:
>
> #include <dc.h> -> #include <dc_types.h> -> #include <os_types.h>

I don't see linux/slab.h in os_types.h. I now see that commit
4fc4dca8320e ("drm/amd: drop use of drmp.h in os_types.h")
was merged into linux-5.3, which may have caused this.

I also don't see anything in os_types.h that needs linux/slab.h.

    Arnd