linux-kernel - Re: [PATCH] staging: erofs: Add braces to do-while statements

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Date:   Sun, 9 Dec 2018 17:20:07 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Thomas Jespersen <laumann.thomas@...il.com>
Cc:     gaoxiang25@...wei.com, yuchao0@...wei.com,
        linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: erofs: Add braces to do-while statements

On Sun, Dec 09, 2018 at 04:59:00PM +0100, Thomas Jespersen wrote:
> This fixes warning reported by sparse (with -Wsparse-all).

Why is sparse warning about this?

> Signed-off-by: Thomas Jespersen <laumann.thomas@...il.com>
> ---
>  drivers/staging/erofs/internal.h | 4 ++--
>  drivers/staging/erofs/utils.c    | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
> index 57575c7f5635..bf180a803446 100644
> --- a/drivers/staging/erofs/internal.h
> +++ b/drivers/staging/erofs/internal.h
> @@ -232,9 +232,9 @@ static inline bool erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt)
>  	/* spin if it is temporarily locked at the reclaim path */
>  	if (unlikely(o == locked)) {
>  #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
> -		do
> +		do {
>  			cpu_relax();
> -		while (atomic_read(&grp->refcount) == locked);
> +		} while (atomic_read(&grp->refcount) == locked);

That looks like valid code to me, why change this?

greg k-h