APPLIED[X/B/F/G]: [X/B/F/G/H/Unstable][SRU][PATCH 1/1] net: napi: remove useless stack trace

[Ian May]

Applied to:
  xenial/linux
  bionic/linux
  focal/linux
  groovy/linux

Thanks,
Ian

On 2020-11-27 19:47:45 , Po-Hsu Lin wrote:
> From: Eric Dumazet <edumazet at google.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1903596
> 
> Whenever a buggy NAPI driver returns more than its budget,
> we emit a stack trace that is of no use, since it does not
> tell which driver is buggy.
> 
> Instead, emit a message giving the function name, and a
> descriptive message.
> 
> Signed-off-by: Eric Dumazet <edumazet at google.com>
> Signed-off-by: David S. Miller <davem at davemloft.net>
> (cherry picked from commit 427d5838e99632e9218eae752009c873cade89ac)
> Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
> ---
>  net/core/dev.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 2020170..e30ea80 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5670,7 +5670,9 @@ static int napi_poll(struct napi_struct *n, struct list_head *repoll)
>  		trace_napi_poll(n, work, weight);
>  	}
>  
> -	WARN_ON_ONCE(work > weight);
> +	if (unlikely(work > weight))
> +		pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n",
> +			    n->poll, work, weight);
>  
>  	if (likely(work < weight))
>  		goto out_unlock;
> -- 
> 2.7.4
> 
> 
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