linux-kernel - Re: [PATCH] xilinx:Remove unused variable num_frag in the function axienet_start

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Date:	Wed, 17 Jun 2015 11:58:48 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Nicholas Krause <xerofoify@...il.com>
CC:	<anirudh@...inx.com>, <John.Linn@...inx.com>,
	<michal.simek@...inx.com>, <netdev@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xilinx:Remove unused variable num_frag in the function
 axienet_start_xmit

On Wed, 2015-06-17 at 12:21PM -0400, Nicholas Krause wrote:
> 
> 
> On June 17, 2015 12:07:30 PM EDT, "Sören Brinkmann" <soren.brinkmann@...inx.com> wrote:
> >On Wed, 2015-06-17 at 11:52AM -0400, Nicholas Krause wrote:
> >> This removes the unused variable num_frag and the setting of it
> >> to the number of fragments from the passed sk_buff pointer by
> >> this function's caller due to this variable never being used
> >> in this particular function and is not declared as  global so
> >> setting it for global use in this file is pointless.
> >> 
> >> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> >> ---
> >>  drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 2 --
> >>  1 file changed, 2 deletions(-)
> >> 
> >> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> >b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> >> index 28b7e7d..624dce4 100644
> >> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> >> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> >> @@ -651,7 +651,6 @@ static inline int
> >axienet_check_tx_bd_space(struct axienet_local *lp,
> >>  static int axienet_start_xmit(struct sk_buff *skb, struct net_device
> >*ndev)
> >>  {
> >>  	u32 ii;
> >> -	u32 num_frag;
> >>  	u32 csum_start_off;
> >>  	u32 csum_index_off;
> >>  	skb_frag_t *frag;
> >> @@ -659,7 +658,6 @@ static int axienet_start_xmit(struct sk_buff
> >*skb, struct net_device *ndev)
> >>  	struct axienet_local *lp = netdev_priv(ndev);
> >>  	struct axidma_bd *cur_p;
> >>  
> >> -	num_frag = skb_shinfo(skb)->nr_frags;
> >>  	cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
> >>  
> >>  	if (axienet_check_tx_bd_space(lp, num_frag)) {
> >
> >It's used right here, isn't it (and further down in this function too)?
> >Does your tree compile with this change?
> >
> >	Sören
> My tree does compile with this change. 

You have to fix your testing process:
    CHK     include/config/kernel.release
    UPD     include/config/kernel.release
    CHK     include/generated/uapi/linux/version.h
    CHK     include/generated/utsrelease.h
    UPD     include/generated/utsrelease.h
    CHK     include/generated/bounds.h
    CHK     include/generated/timeconst.h
    CHK     include/generated/asm-offsets.h
    CALL    scripts/checksyscalls.sh
  <stdin>:1253:2: warning: #warning syscall userfaultfd not implemented [-Wcpp]
    CC      drivers/net/ethernet/xilinx/xilinx_axienet_main.o
  drivers/net/ethernet/xilinx/xilinx_axienet_main.c: In function 'axienet_start_xmit':
  drivers/net/ethernet/xilinx/xilinx_axienet_main.c:667:36: error: 'num_frag' undeclared (first use in this function)
    if (axienet_check_tx_bd_space(lp, num_frag)) {
                                      ^
  drivers/net/ethernet/xilinx/xilinx_axienet_main.c:667:36: note: each undeclared identifier is reported only once for each function it appears in
  scripts/Makefile.build:258: recipe for target 'drivers/net/ethernet/xilinx/xilinx_axienet_main.o' failed
  make[1]: *** [drivers/net/ethernet/xilinx/xilinx_axienet_main.o] Error 1
  Makefile:1545: recipe for target 'drivers/net/ethernet/xilinx/xilinx_axienet_main.o' failed
  make: *** [drivers/net/ethernet/xilinx/xilinx_axienet_main.o] Error 2

NACK for the patch.

	Sören
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