linux-kernel - Re: [PATCH] nvme: replace max(a, min(b, c)) by clamp(b, a, c)

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Message-ID: <20250319210032.5d442b0c@pumpkin>
Date: Wed, 19 Mar 2025 21:00:32 +0000
From: David Laight <david.laight.linux@...il.com>
To: <shao.mingyin@....com.cn>
Cc: <hch@....de>, <sagi@...mberg.me>, <kch@...dia.com>,
 <linux-nvme@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
 <yang.tao172@....com.cn>, <yang.yang29@....com.cn>, <xu.xin16@....com.cn>
Subject: Re: [PATCH] nvme: replace max(a, min(b, c)) by clamp(b, a, c)

On Mon, 17 Mar 2025 15:39:09 +0800 (CST)
<shao.mingyin@....com.cn> wrote:

> From: LiHaoran <li.haoran7@....com.cn>
> 
> This patch replaces max(a, min(b, c)) by clamp(b, a, c) in the nvme
> driver. This improves the readability.
> 
> Signed-off-by: LiHaoran <li.haoran7@....com.cn>
> Cc: ShaoMingyin <shao.mingyin@....com.cn>
> ---
>  drivers/nvme/target/nvmet.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
> index fcf4f460dc9a..30804b0ca66e 100644
> --- a/drivers/nvme/target/nvmet.h
> +++ b/drivers/nvme/target/nvmet.h
> @@ -819,7 +819,7 @@ static inline u8 nvmet_cc_iocqes(u32 cc)
>  /* Convert a 32-bit number to a 16-bit 0's based number */
>  static inline __le16 to0based(u32 a)
>  {
> -	return cpu_to_le16(max(1U, min(1U << 16, a)) - 1);
> +	return cpu_to_le16(clamp(1U << 16, 1U, a) - 1);

Swap the arguments into a sane order - clamp(a, 1, 1 << 16)

	David

>  }
> 
>  static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns)