linux-kernel - [PATCH 2/3] drm/tinydrm: mipi-dbi: Fix field width specifier warning

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Message-Id: <20170223132957.2839-3-noralf@tronnes.org>
Date:   Thu, 23 Feb 2017 14:29:56 +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 2/3] drm/tinydrm: mipi-dbi: Fix field width specifier warning

This warning is seen on 64-bit builds in functions:
   'mipi_dbi_typec1_command':
   'mipi_dbi_typec3_command_read':
   'mipi_dbi_typec3_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);
     ^~~~~~~~~~~~~~~~~~~~~~

Fix by casting 'len' to int in the macro MIPI_DBI_DEBUG_COMMAND().
There is no chance of overflow.

Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
---
 drivers/gpu/drm/tinydrm/mipi-dbi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 2caecde..2d21b49 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -62,9 +62,9 @@
 	if (!len) \
 		DRM_DEBUG_DRIVER("cmd=%02x\n", cmd); \
 	else if (len <= 32) \
-		DRM_DEBUG_DRIVER("cmd=%02x, par=%*ph\n", cmd, len, data); \
+		DRM_DEBUG_DRIVER("cmd=%02x, par=%*ph\n", cmd, (int)len, data);\
 	else \
-		DRM_DEBUG_DRIVER("cmd=%02x, len=%zu\n", cmd, len); \
+		DRM_DEBUG_DRIVER("cmd=%02x, len=%zu\n", cmd, (int)len); \
 })
 
 static const u8 mipi_dbi_dcs_read_commands[] = {
-- 
2.10.2