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

From: Sean Paul
Date: Tue Sep 27 2016 - 11:55:33 EST

On Mon, Sep 26, 2016 at 4:36 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> 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/
>> 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@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxx>

>> 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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