linux-kernel - Re: [PATCH v4] drm/xe: Fix build error for XE_IOCTL

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Message-ID: <p3vspkvcm7nq3gankpblloudrumenpcuflhu5fpdse75kcyyk6@w7adi7togz4j>
Date: Tue, 5 Nov 2024 01:28:31 -0600
From: Lucas De Marchi <lucas.demarchi@...el.com>
To: Gyeyoung Baek <gye976@...il.com>
CC: Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>, <intel-xe@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] drm/xe: Fix build error for XE_IOCTL_DBG macro

On Mon, Nov 04, 2024 at 12:04:30PM -0600, Lucas De Marchi wrote:
>On Sat, Nov 02, 2024 at 11:22:03AM +0900, Gyeyoung Baek wrote:
>>if CONFIG_DRM_USE_DYNAMIC_DEBUG is set,
>>'drm_dbg' function is replaced with '__dynamic_func_call_cls',
>>which is replaced with a do while statement.
>>so in the previous code, there are the following build errors.
>>
>>include/linux/dynamic_debug.h:221:58: error: expected expression before ‘do’
>> 221 | #define __dynamic_func_call_cls(id, cls, fmt, func, ...) do {   \
>>     |                                                          ^~
>>include/linux/dynamic_debug.h:248:9: note: in expansion of macro ‘__dynamic_func_call_cls’
>> 248 |         __dynamic_func_call_cls(__UNIQUE_ID(ddebug), cls, fmt, func, ##__VA_ARGS__)
>>     |         ^~~~~~~~~~~~~~~~~~~~~~~
>>include/drm/drm_print.h:425:9: note: in expansion of macro ‘_dynamic_func_call_cls’
>> 425 |         _dynamic_func_call_cls(cat, fmt, __drm_dev_dbg,         \
>>     |         ^~~~~~~~~~~~~~~~~~~~~~
>>include/drm/drm_print.h:504:9: note: in expansion of macro ‘drm_dev_dbg’
>> 504 |         drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
>>     |         ^~~~~~~~~~~
>>include/drm/drm_print.h:522:33: note: in expansion of macro ‘drm_dbg_driver’
>> 522 | #define drm_dbg(drm, fmt, ...)  drm_dbg_driver(drm, fmt, ##__VA_ARGS__)
>>     |                                 ^~~~~~~~~~~~~~
>>drivers/gpu/drm/xe/xe_macros.h:14:21: note: in expansion of macro ‘drm_dbg’
>>  14 |         ((cond) && (drm_dbg(&(xe)->drm, \
>>     |                     ^~~~~~~
>>drivers/gpu/drm/xe/xe_bo.c:2029:13: note: in expansion of macro ‘XE_IOCTL_DBG’
>>2029 |         if (XE_IOCTL_DBG(xe, !gem_obj))
>>
>>the problem is that,
>>XE_IOCTL_DBG uses this function for conditional expr.
>>
>>so I fix the expr to be compatible with the do while statement,
>>by referring to "https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html".
>>
>>v2: I modified this to print when only cond is true.
>>v3: Modify to evaluate cond only once.
>>v4: There was a mistake in v3, send this again.
>>
>>Signed-off-by: Gyeyoung Baek <gye976@...il.com>
>
>
>Reviewed-by: Lucas De Marchi <lucas.demarchi@...el.com>
>
>I will apply this to drm-xe-next once we have CI back.

there were some checkpatch issues about mixing tabs and spaces. Next
time please double check the checkpatch output. I also reworded the
commit message a little bit to follow an imperative mood as outlined at
https://www.kernel.org/doc/html/v4.10/process/submitting-patches.html#describe-your-changes

Applied to drm-xe-next. Thanks.

Lucas De Marchi

>
>thanks
>Lucas De Marchi