linux-kernel - Re: [PATCH 1/1] staging: lustre/lustre/obdclass/llog_cat.c: get rid of sparse context imbalance warning

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Date:	Wed, 3 Jun 2015 12:12:59 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Tolga Ceylan <tolga.ceylan@...il.com>
Cc:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Greg Donald <gdonald@...il.com>, Joe Perches <joe@...ches.com>,
	Darshana Padmadas <darshanapadmadas@...il.com>,
	Arjun AK <arjunak234@...il.com>, HPDD-discuss@...ts.01.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] staging: lustre/lustre/obdclass/llog_cat.c: get rid
 of sparse context imbalance warning

On Tue, Jun 02, 2015 at 12:57:20PM -0700, Tolga Ceylan wrote:
> In llog_cat_new_log(), sparse emits a context imbalance (unexpected lock)
> warning due its inability to detect the noreturn attribute in
> lbug_with_lock() function inside LBUG macro. Adding a never reached
> return statement suppresses this warning.
but adding a statement which never executes, is that the correct solution?
what about :

diff --git a/drivers/staging/lustre/lustre/obdclass/llog_cat.c b/drivers/staging/lustre/lustre/obdclass/llog_cat.c
index c8f6ab0..1cb3495 100644
--- a/drivers/staging/lustre/lustre/obdclass/llog_cat.c
+++ b/drivers/staging/lustre/lustre/obdclass/llog_cat.c
@@ -103,13 +103,12 @@ static int llog_cat_new_log(const struct lu_env *env,
 
 	spin_lock(&loghandle->lgh_hdr_lock);
 	llh->llh_count++;
-	if (ext2_set_bit(index, llh->llh_bitmap)) {
-		CERROR("argh, index %u already set in log bitmap?\n",
-		       index);
-		spin_unlock(&loghandle->lgh_hdr_lock);
+	rc = ext2_set_bit(index, llh->llh_bitmap);
+	spin_unlock(&loghandle->lgh_hdr_lock);
+	if (rc) {
+		CERROR("argh, index %u already set in log bitmap?\n", index);
 		LBUG(); /* should never happen */
 	}
-	spin_unlock(&loghandle->lgh_hdr_lock);
 
 	cathandle->lgh_last_idx = index;
 	llh->llh_tail.lrt_index = index;


regards
sudip	

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