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* [PATCH] mptcp: Remove redundant assignment to remaining
@ 2021-06-15 10:55 Jiapeng Chong
  2021-06-15 23:52 ` Mat Martineau
  0 siblings, 1 reply; 2+ messages in thread
From: Jiapeng Chong @ 2021-06-15 10:55 UTC (permalink / raw)
  To: mathew.j.martineau
  Cc: matthieu.baerts, davem, kuba, netdev, mptcp, linux-kernel, Jiapeng Chong

Variable remaining is assigned, but this value is never read as it is
not used later on, hence it is a redundant assignment and can be
removed.

Clean up the following clang-analyzer warning:

net/mptcp/options.c:779:3: warning: Value stored to 'remaining' is never
read [clang-analyzer-deadcode.DeadStores].

net/mptcp/options.c:547:3: warning: Value stored to 'remaining' is never
read [clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 net/mptcp/options.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 9b263f2..f99272f 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -544,7 +544,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
 
 		map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64;
 
-		remaining -= map_size;
 		dss_size = map_size;
 		if (mpext)
 			opts->ext_copy = *mpext;
@@ -776,7 +775,6 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
 
 	if (mptcp_established_options_mp_prio(sk, &opt_size, remaining, opts)) {
 		*size += opt_size;
-		remaining -= opt_size;
 		ret = true;
 	}
 
-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] mptcp: Remove redundant assignment to remaining
  2021-06-15 10:55 [PATCH] mptcp: Remove redundant assignment to remaining Jiapeng Chong
@ 2021-06-15 23:52 ` Mat Martineau
  0 siblings, 0 replies; 2+ messages in thread
From: Mat Martineau @ 2021-06-15 23:52 UTC (permalink / raw)
  To: Jiapeng Chong; +Cc: matthieu.baerts, davem, kuba, netdev, mptcp, linux-kernel


On Tue, 15 Jun 2021, Jiapeng Chong wrote:

> Variable remaining is assigned, but this value is never read as it is
> not used later on, hence it is a redundant assignment and can be
> removed.
>
> Clean up the following clang-analyzer warning:
>
> net/mptcp/options.c:779:3: warning: Value stored to 'remaining' is never
> read [clang-analyzer-deadcode.DeadStores].
>
> net/mptcp/options.c:547:3: warning: Value stored to 'remaining' is never
> read [clang-analyzer-deadcode.DeadStores].
>
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
> net/mptcp/options.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/net/mptcp/options.c b/net/mptcp/options.c
> index 9b263f2..f99272f 100644
> --- a/net/mptcp/options.c
> +++ b/net/mptcp/options.c
> @@ -544,7 +544,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
>
> 		map_size = TCPOLEN_MPTCP_DSS_BASE + TCPOLEN_MPTCP_DSS_MAP64;
>
> -		remaining -= map_size;

Hi Jiapeng, thank you for your MPTCP patch!

This change in mptcp_established_options_dss() removes the only reference 
to 'remaining' in that function, so the variable should also be removed 
from the function parameters. It also appears to be unused in 
mptcp_established_options_mp().

I'd like to handle this patch through the MPTCP tree so we can manage 
conflicts with other in-progress patches. This patch does apply to 
net-next cleanly but not our subsystem branch. You can find our git repo 
at https://github.com/multipath-tcp/mptcp_net-next, and develop patches 
using the 'export' branch. If you email a v2 patch to 
mptcp@lists.linux.dev (no need to cc other lists), Matthieu and I can make 
sure it is integrated in the MPTCP repository and handle sending it to 
netdev along with other patches from the MPTCP community.

> 		dss_size = map_size;
> 		if (mpext)
> 			opts->ext_copy = *mpext;
> @@ -776,7 +775,6 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
>
> 	if (mptcp_established_options_mp_prio(sk, &opt_size, remaining, opts)) {
> 		*size += opt_size;
> -		remaining -= opt_size;
> 		ret = true;
> 	}
>
> -- 
> 1.8.3.1

Best regards,

--
Mat Martineau
Intel

^ permalink raw reply	[flat|nested] 2+ messages in thread

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