linux-kernel - Re: [PATCH][next] drivers: net: xgene: remove redundant assignment to variable offset

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Message-ID: <4e0d27a6-37be-4b6e-a60e-508bcb0884cb@moroto.mountain>
Date: Thu, 8 Feb 2024 16:40:06 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: Colin Ian King <colin.i.king@...il.com>,
	Iyappan Subramanian <iyappan@...amperecomputing.com>,
	Keyur Chudgar <keyur@...amperecomputing.com>,
	Quan Nguyen <quan@...amperecomputing.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drivers: net: xgene: remove redundant assignment
 to variable offset

On Thu, Feb 08, 2024 at 12:39:24PM +0000, Vadim Fedorenko wrote:
> On 08.02.2024 12:20, Colin Ian King wrote:
> > The variable offset is being initialized with a value that is never
> > read, it is being re-assigned later on in either path of an if
> > statement before being used. The initialization is redundant and
> > can be removed.
> > 
> > Cleans up clang scan build warning:
> > drivers/net/ethernet/apm/xgene/xgene_enet_cle.c:736:2: warning: Value
> > stored to 'offset' is never read [deadcode.DeadStores]
> > 
> > Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> > ---
> >   drivers/net/ethernet/apm/xgene/xgene_enet_cle.c | 1 -
> >   1 file changed, 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c b/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
> > index de5464322311..8f104642897b 100644
> > --- a/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
> > +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
> > @@ -733,7 +733,6 @@ static int xgene_cle_setup_rss(struct xgene_enet_pdata *pdata)
> >   	u32 offset, val = 0;
> >   	int i, ret = 0;
> > -	offset = CLE_PORT_OFFSET;
> >   	for (i = 0; i < cle->parsers; i++) {
> >   		if (cle->active_parser != PARSER_ALL)
> >   			offset = cle->active_parser * CLE_PORT_OFFSET;
> 
> It looks like more refactoring can be done here.
> "if (cle->active_parser != PARSER_ALL)" is static, no need to check it inside
> the loop.
>

You still need to check...  I don't really think it's an improvement.

regards,
dan carpenter

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c b/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
index de5464322311..61e31cc55771 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_cle.c
@@ -733,11 +733,11 @@ static int xgene_cle_setup_rss(struct xgene_enet_pdata *pdata)
 	u32 offset, val = 0;
 	int i, ret = 0;
 
-	offset = CLE_PORT_OFFSET;
+	if (cle->active_parser != PARSER_ALL)
+		offset = cle->active_parser * CLE_PORT_OFFSET;
+
 	for (i = 0; i < cle->parsers; i++) {
-		if (cle->active_parser != PARSER_ALL)
-			offset = cle->active_parser * CLE_PORT_OFFSET;
-		else
+		if (cle->active_parser == PARSER_ALL)
 			offset = i * CLE_PORT_OFFSET;
 
 		/* enable RSS */