linux-kernel - Re: [PATCH 0/3] drm/tinydrm: Fix compiler warnings

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Message-ID: <afffd1b1-e04f-e0fc-ac08-b2b9c1b33223@tronnes.org>
Date:   Fri, 24 Feb 2017 02:36:19 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, Dave Airlie <airlied@...il.com>
Subject: Re: [PATCH 0/3] drm/tinydrm: Fix compiler warnings

I see that I forgot cc'ing Dave Airlie on this, and I just realised
that the backlight problem isn't just a warning, but it actually causes
a build failure if backlight is built as a module.
I missed this in my hurry to get this out the door, sorry.


Den 23.02.2017 14.29, skrev Noralf Trønnes:
> Dave pulled tinydrm yesterday which triggered some compiler warnings:
>
> Dave Airlie:
> drivers/gpu/drm/tinydrm/mipi-dbi.c: In function ‘mipi_dbi_debugfs_command_write’:
> drivers/gpu/drm/tinydrm/mipi-dbi.c:905:8: warning: ‘cmd’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>    ret = mipi_dbi_command_buf(mipi, cmd, parameters, i);
>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> I didn't see this on gcc 4.8, but it showed up when I used gcc 6.2.
>
> kbuild test robot:
> [drm:drm-next 1199/1208] drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c:198:26: error: redefinition of 'tinydrm_of_find_backlight'
>
> kbuild test robot:
>     drivers/gpu/drm/tinydrm/mipi-dbi.c: In function 'mipi_dbi_typec1_command':
>>> drivers/gpu/drm/tinydrm/mipi-dbi.c:65:20: warning: field width specifier '*' expects argument of type 'int', but argument 5 has type 'size_t {aka long unsigned int}' [-Wformat=]
>        DRM_DEBUG_DRIVER("cmd=%02x, par=%*ph\n", cmd, len, data); \
>                         ^
>     include/drm/drmP.h:228:40: note: in definition of macro 'DRM_DEBUG_DRIVER'
>       drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
>                                             ^~~
>>> drivers/gpu/drm/tinydrm/mipi-dbi.c:671:2: note: in expansion of macro 'MIPI_DBI_DEBUG_COMMAND'
>       MIPI_DBI_DEBUG_COMMAND(cmd, parameters, num);
>       ^~~~~~~~~~~~~~~~~~~~~~
>
> Noralf.
>
>
> Noralf Trønnes (3):
>    drm/tinydrm: mipi-dbi: Silence: ‘cmd’ may be used uninitialized
>    drm/tinydrm: mipi-dbi: Fix field width specifier warning
>    drm/tinydrm: helpers: Properly fix backlight dependency
>
>   drivers/gpu/drm/tinydrm/mipi-dbi.c    |  6 +++---
>   include/drm/tinydrm/tinydrm-helpers.h | 19 -------------------
>   2 files changed, 3 insertions(+), 22 deletions(-)
>
> --
> 2.10.2
>