linux-kernel - [PATCH v7 02/10] staging: fsl-mc: fix macros with possible side effects

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Date:   Thu, 8 Jun 2017 17:28:47 +0300
From:   <laurentiu.tudor@....com>
To:     <gregkh@...uxfoundation.org>, <stuyoder@...il.com>
CC:     <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
        <marc.zyngier@....com>, <agraf@...e.de>, <arnd@...db.de>,
        <ioana.ciornei@....com>, <ruxandra.radulescu@....com>,
        <bharat.bhushan@....com>, <catalin.horghidan@....com>,
        <leoyang.li@....com>, <roy.pledge@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH v7 02/10] staging: fsl-mc: fix macros with possible side effects

From: Laurentiu Tudor <laurentiu.tudor@....com>

Several macros were triggering this checkpatch.pl warning:
  "Macro argument reuse '$arg' - possible side-effects?"
Fix the warning by avoiding multiple macro argument use.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---

Notes:
    -v7
      -no changes

 drivers/staging/fsl-mc/bus/dprc-driver.c      | 10 +++++++---
 drivers/staging/fsl-mc/bus/fsl-mc-allocator.c | 11 +++++++----
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dprc-driver.c b/drivers/staging/fsl-mc/bus/dprc-driver.c
index d723c69..39c9a3b 100644
--- a/drivers/staging/fsl-mc/bus/dprc-driver.c
+++ b/drivers/staging/fsl-mc/bus/dprc-driver.c
@@ -21,9 +21,13 @@
 
 #define FSL_MC_DPRC_DRIVER_NAME    "fsl_mc_dprc"
 
-#define FSL_MC_DEVICE_MATCH(_mc_dev, _obj_desc) \
-	(strcmp((_mc_dev)->obj_desc.type, (_obj_desc)->type) == 0 && \
-	 (_mc_dev)->obj_desc.id == (_obj_desc)->id)
+#define FSL_MC_DEVICE_MATCH(_mc_dev, _obj_desc)				\
+({									\
+	struct fsl_mc_device *__mc_dev = _mc_dev;			\
+	struct dprc_obj_desc *__obj_desc = _obj_desc;			\
+	(strcmp(__mc_dev->obj_desc.type, __obj_desc->type) == 0 &&	\
+	__mc_dev->obj_desc.id == __obj_desc->id);			\
+})
 
 struct dprc_child_objs {
 	int child_count;
diff --git a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
index ce07096..d3def40 100644
--- a/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
+++ b/drivers/staging/fsl-mc/bus/fsl-mc-allocator.c
@@ -17,10 +17,13 @@
 #include "dpcon-cmd.h"
 #include "fsl-mc-private.h"
 
-#define FSL_MC_IS_ALLOCATABLE(_obj_type) \
-	(strcmp(_obj_type, "dpbp") == 0 || \
-	 strcmp(_obj_type, "dpmcp") == 0 || \
-	 strcmp(_obj_type, "dpcon") == 0)
+#define FSL_MC_IS_ALLOCATABLE(_obj_type)	\
+({						\
+	const char *__obj_type = _obj_type;	\
+	(strcmp(__obj_type, "dpbp") == 0 ||	\
+	 strcmp(__obj_type, "dpmcp") == 0 ||	\
+	 strcmp(__obj_type, "dpcon") == 0);	\
+})
 
 /**
  * fsl_mc_resource_pool_add_device - add allocatable object to a resource
-- 
2.9.4