linux-kernel - Re: [PATCH 2/2] drm: Simplify drm_printk to reduce object size quite a bit

Open Source and information security mailing list archives

Date:   Tue, 27 Sep 2016 11:54:50 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        Joe Perches <joe@...ches.com>, David Airlie <airlied@...ux.ie>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 2/2] drm: Simplify drm_printk to reduce object size quite
 a bit

On Mon, Sep 26, 2016 at 4:36 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Sun, Sep 25, 2016 at 07:18:34PM -0700, Joe Perches wrote:
>> Remove function name and special " *ERROR*" from argument list
>>
>> $ size drivers/gpu/drm/built-in.o* (x86-32 defconfig, most drm selected)
>>    text          data     bss     dec     hex filename
>> 5635366        182579   14328 5832273  58fe51 drivers/gpu/drm/built-in.o.new
>> 5779552        182579   14328 5976459  5b318b drivers/gpu/drm/built-in.o.old
>>
>> Using "%ps", __builtin_return_address(0) is the same as "%s", __func__
>> except for static inlines, but it's more or less the same output.
>
> And for static inlines we more often want to know which of the many
> callers triggered the error. We would have to play it by ear to see
> which error messages need to be improved in cases where it not obvious
> without the context of the static inline function name.
>
> Lgtm, reducing the call size for DRM_DEBUG is a definite improvement.
> Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
>

Agreed on the static inlines, hopefully we won't break anyone's log
grep workflow.

I will push this to -misc in a couple days if no one objects.

Reviewed-by: Sean Paul <seanpaul@...omium.org>

>>
>> Miscellanea:
>>
>> o Convert args... to ##__VA_ARGS__
>> o The equivalent DRM_DEV_<FOO> macros are rarely used and not
>>   worth conversion
>
> Today. I would rather see us to migrate to DRM_DEV (i.e. dev_printk) so
> that the drm subsystem is consistent with the rest of the kernel and
> providing the necessary information for syslog filtering.
> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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