linux-kernel - Re: [PATCH] drm/i915: make i915_drm_client

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Date:   Fri, 16 Jun 2023 12:17:50 +0100
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Andi Shyti <andi.shyti@...ux.intel.com>,
        Arnd Bergmann <arnd@...nel.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Arnd Bergmann <arnd@...db.de>,
        Matt Roper <matthew.d.roper@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Alan Previn <alan.previn.teres.alexis@...el.com>,
        Anshuman Gupta <anshuman.gupta@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: make i915_drm_client_fdinfo() reference
 conditional again


On 16/06/2023 11:16, Andi Shyti wrote:
> Hi Arnd,
> 
> On Fri, Jun 16, 2023 at 11:31:47AM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> The function is only defined if CONFIG_PROC_FS is enabled:
>>
>> ld.lld: error: undefined symbol: i915_drm_client_fdinfo
>>>>> referenced by i915_driver.c
>>>>>                drivers/gpu/drm/i915/i915_driver.o:(i915_drm_driver) in archive vmlinux.a
>>
>> Use the PTR_IF() helper to make the reference NULL otherwise.
>>
>> Fixes: e894b724c316d ("drm/i915: Use the fdinfo helper")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>   drivers/gpu/drm/i915/i915_driver.c     | 2 +-
>>   drivers/gpu/drm/i915/i915_drm_client.h | 2 --
>>   2 files changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
>> index 75cbc43b326dd..0ad0c5885ec27 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -1816,7 +1816,7 @@ static const struct drm_driver i915_drm_driver = {
>>   	.open = i915_driver_open,
>>   	.lastclose = i915_driver_lastclose,
>>   	.postclose = i915_driver_postclose,
>> -	.show_fdinfo = i915_drm_client_fdinfo,
>> +	.show_fdinfo = PTR_IF(IS_ENABLED(CONFIG_PROC_FS), i915_drm_client_fdinfo),
>>   
>>   	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>>   	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>> diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
>> index 4c18b99e10a4e..67816c912bca1 100644
>> --- a/drivers/gpu/drm/i915/i915_drm_client.h
>> +++ b/drivers/gpu/drm/i915/i915_drm_client.h
>> @@ -47,8 +47,6 @@ static inline void i915_drm_client_put(struct i915_drm_client *client)
>>   
>>   struct i915_drm_client *i915_drm_client_alloc(void);
>>   
>> -#ifdef CONFIG_PROC_FS
>>   void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file);
>> -#endif
> 
> nice! This is becoming the new trend now.
> 
> Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>

Thanks for the fix and review! (And I got to learn about existence of 
PTR_IF too.)

Andi will you merge once green or should I?

Regards,

Tvrtko