linux-kernel - [PATCH] scsi: mpt3sas_scsih: remove unnecessary statics

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Message-ID: <20170719220636.GA8136@embeddedgus>
Date:   Wed, 19 Jul 2017 17:06:36 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] scsi: mpt3sas_scsih: remove unnecessary statics

Remove unnecessary static on local variables raid_device.
Such variables are initialized before being used, on
every execution path throughout the functions. The
static has no benefit and, removing it reduces the
object file size.

This issue was detected using Coccinelle and the following semantic patch:

@bad exists@
position p;
identifier x;
type T;
@@

static T x@p;
...
x = <+...x...+>

@@
identifier x;
expression e;
type T;
position p != bad.p;
@@

-static
 T x@p;
 ... when != x
     when strict
?x = e;

In the following log you can see a significant difference in the object
file size. This log is the output of the size command, before and after
the code change:

before:
   text    data     bss     dec     hex filename
 126304   30384    1280  157968   26910 drivers/scsi/mpt3sas/mpt3sas_scsih.o

after:
   text    data     bss     dec     hex filename
 126292   30240    1152  157684   267f4 drivers/scsi/mpt3sas/mpt3sas_scsih.o

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 22998cb..417e5d1 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -1571,7 +1571,7 @@ scsih_get_resync(struct device *dev)
 {
 	struct scsi_device *sdev = to_scsi_device(dev);
 	struct MPT3SAS_ADAPTER *ioc = shost_priv(sdev->host);
-	static struct _raid_device *raid_device;
+	struct _raid_device *raid_device;
 	unsigned long flags;
 	Mpi2RaidVolPage0_t vol_pg0;
 	Mpi2ConfigReply_t mpi_reply;
@@ -1632,7 +1632,7 @@ scsih_get_state(struct device *dev)
 {
 	struct scsi_device *sdev = to_scsi_device(dev);
 	struct MPT3SAS_ADAPTER *ioc = shost_priv(sdev->host);
-	static struct _raid_device *raid_device;
+	struct _raid_device *raid_device;
 	unsigned long flags;
 	Mpi2RaidVolPage0_t vol_pg0;
 	Mpi2ConfigReply_t mpi_reply;
@@ -7027,7 +7027,7 @@ _scsih_sas_ir_operation_status_event(struct MPT3SAS_ADAPTER *ioc,
 	Mpi2EventDataIrOperationStatus_t *event_data =
 		(Mpi2EventDataIrOperationStatus_t *)
 		fw_event->event_data;
-	static struct _raid_device *raid_device;
+	struct _raid_device *raid_device;
 	unsigned long flags;
 	u16 handle;
 
@@ -7531,7 +7531,7 @@ _scsih_scan_for_devices_after_reset(struct MPT3SAS_ADAPTER *ioc)
 	u64 sas_address;
 	struct _sas_device *sas_device;
 	struct _sas_node *expander_device;
-	static struct _raid_device *raid_device;
+	struct _raid_device *raid_device;
 	u8 retry_count;
 	unsigned long flags;
 
-- 
2.5.0