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

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Date:   Thu, 23 Feb 2017 14:29:54 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Noralf Trønnes <noralf@...nnes.org>
Subject: [PATCH 0/3] drm/tinydrm: Fix compiler warnings

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