linux-kernel - [RFC][PATCH 15/16] writeback: clean-up the warning about non-registered bdi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 16 Jul 2010 15:45:11 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 15/16] writeback: clean-up the warning about non-registered bdi

From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

In '__mark_inode_dirty()', when the corresponding bdi was not properly
registered, we print a warning. But the corresponding code is a bit
untidy, it used if and 'WARN_ON(1)' and printk.

This patch turns it into one multi-line WARN() statement which looks
tidier and also uses 'unlikely()' for the condition which might matter
a tiny bit for this hot-path function.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
---
 fs/fs-writeback.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 559092d..83662fb 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -981,12 +981,9 @@ void __mark_inode_dirty(struct inode *inode, int flags)
 			struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
 			struct backing_dev_info *bdi = wb->bdi;
 
-			if (bdi_cap_writeback_dirty(bdi) &&
-			    !test_bit(BDI_registered, &bdi->state)) {
-				WARN_ON(1);
-				printk(KERN_ERR "bdi-%s not registered\n",
-								bdi->name);
-			}
+			WARN(bdi_cap_writeback_dirty(bdi) &&
+			     !test_bit(BDI_registered, &bdi->state),
+			     "bdi-%s not registered\n", bdi->name);
 
 			inode->dirtied_when = jiffies;
 			list_move(&inode->i_list, &wb->b_dirty);
-- 
1.7.1.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/