linux-kernel - Re: [PATCH 7/9 net-next] sunrpc: replace if/BUG by BUG

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Date:	Mon, 30 Mar 2015 17:25:20 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	"David S. Miller" <davem@...emloft.net>, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 7/9 net-next] sunrpc: replace if/BUG by BUG_ON

Huh, I thought this wasn't recommended:

	http://lkml.kernel.org/r/20040828125816.206ef7fa.akpm@osdl.org

	"I'd prefer that we not move code which has side-effects into
	BUG_ONs"

--b.

On Mon, Mar 30, 2015 at 11:13:15PM +0200, Fabian Frederick wrote:
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  net/sunrpc/auth_gss/svcauth_gss.c | 9 +++------
>  net/sunrpc/svc_xprt.c             | 3 +--
>  2 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
> index 1095be9..09f8a1c6 100644
> --- a/net/sunrpc/auth_gss/svcauth_gss.c
> +++ b/net/sunrpc/auth_gss/svcauth_gss.c
> @@ -840,11 +840,9 @@ unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct g
>  		return stat;
>  	if (integ_len > buf->len)
>  		return stat;
> -	if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
> -		BUG();
> +	BUG_ON(xdr_buf_subsegment(buf, &integ_buf, 0, integ_len));
>  	/* copy out mic... */
> -	if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
> -		BUG();
> +	BUG_ON(read_u32_from_xdr_buf(buf, integ_len, &mic.len));
>  	if (mic.len > RPC_MAX_AUTH_SIZE)
>  		return stat;
>  	mic.data = kmalloc(mic.len, GFP_KERNEL);
> @@ -1595,8 +1593,7 @@ svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
>  	BUG_ON(integ_len % 4);
>  	*p++ = htonl(integ_len);
>  	*p++ = htonl(gc->gc_seq);
> -	if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
> -		BUG();
> +	BUG_ON(xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len));
>  	if (resbuf->tail[0].iov_base == NULL) {
>  		if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
>  			goto out_err;
> diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
> index 163ac45..2f82e8b 100644
> --- a/net/sunrpc/svc_xprt.c
> +++ b/net/sunrpc/svc_xprt.c
> @@ -960,8 +960,7 @@ static void svc_delete_xprt(struct svc_xprt *xprt)
>  	struct svc_deferred_req *dr;
>  
>  	/* Only do this once */
> -	if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
> -		BUG();
> +	BUG_ON(test_and_set_bit(XPT_DEAD, &xprt->xpt_flags));
>  
>  	dprintk("svc: svc_delete_xprt(%p)\n", xprt);
>  	xprt->xpt_ops->xpo_detach(xprt);
> -- 
> 1.9.1
--
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