linux-kernel - Re: [PATCH] xfs: Use WARN_ON_ONCE rather than BUG for bailout mount-operation

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Message-ID: <20190830003356.GW5354@magnolia>
Date:   Thu, 29 Aug 2019 17:33:56 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Austin Kim <austindh.kim@...il.com>
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfs: Use WARN_ON_ONCE rather than BUG for bailout
 mount-operation

On Fri, Aug 30, 2019 at 09:30:22AM +0900, Austin Kim wrote:
> If the CONFIG_BUG is enabled, BUG is executed and then system is crashed.
> However, the bailout for mount is no longer proceeding.
> 
> For this reason, using WARN_ON_ONCE rather than BUG can prevent this situation.
> 
> Signed-off-by: Austin Kim <austindh.kim@...il.com>
> ---
>  fs/xfs/xfs_mount.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 322da69..c0d0b72 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -213,8 +213,7 @@ xfs_initialize_perag(
>  			goto out_hash_destroy;
>  
>  		spin_lock(&mp->m_perag_lock);
> -		if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
> -			BUG();
> +		if (WARN_ON_ONCE(radix_tree_insert(&mp->m_perag_tree, index, pag))) {

Er... please wrap the line at 80 columns.

--D

>  			spin_unlock(&mp->m_perag_lock);
>  			radix_tree_preload_end();
>  			error = -EEXIST;
> -- 
> 2.6.2
>