netdev - Re: [PATCH net-next 8/8] SUNRPC: use min() to simplify the code

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Message-ID: <20240824180750.GQ2164@kernel.org>
Date: Sat, 24 Aug 2024 19:07:50 +0100
From: Simon Horman <horms@...nel.org>
To: Li Zetao <lizetao1@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, marcel@...tmann.org, johan.hedberg@...il.com,
	luiz.dentz@...il.com, idryomov@...il.com, xiubli@...hat.com,
	dsahern@...nel.org, trondmy@...nel.org, anna@...nel.org,
	chuck.lever@...cle.com, jlayton@...nel.org, neilb@...e.de,
	okorniev@...hat.com, Dai.Ngo@...cle.com, tom@...pey.com,
	jmaloy@...hat.com, ying.xue@...driver.com, linux@...blig.org,
	jacob.e.keller@...el.com, willemb@...gle.com, kuniyu@...zon.com,
	wuyun.abel@...edance.com, quic_abchauha@...cinc.com,
	gouhao@...ontech.com, netdev@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, ceph-devel@...r.kernel.org,
	linux-nfs@...r.kernel.org, tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH net-next 8/8] SUNRPC: use min() to simplify the code

On Thu, Aug 22, 2024 at 09:39:08PM +0800, Li Zetao wrote:
> When reading pages in xdr_read_pages, the number of XDR encoded bytes
> should be less than the len of aligned pages, so using min() here is
> very semantic.
> 
> Signed-off-by: Li Zetao <lizetao1@...wei.com>
> ---
>  net/sunrpc/xdr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
> index 62e07c330a66..6746e920dbbb 100644
> --- a/net/sunrpc/xdr.c
> +++ b/net/sunrpc/xdr.c
> @@ -1602,7 +1602,7 @@ unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
>  	end = xdr_stream_remaining(xdr) - pglen;
>  
>  	xdr_set_tail_base(xdr, base, end);
> -	return len <= pglen ? len : pglen;
> +	return min(len, pglen);

Both len and pglen are unsigned int, so this seems correct to me.

And the code being replaced does appear to be a min() operation in
both form and function.

Reviewed-by: Simon Horman <horms@...nel.org>

However, I don't believe SUNRPC changes usually don't go through next-next.
So I think this either needs to be reposted or get some acks from
Chuck Lever (already CCed).

Chuck, perhaps you can offer some guidance here?

>  }
>  EXPORT_SYMBOL_GPL(xdr_read_pages);
>  
> -- 
> 2.34.1
> 
>