From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Andreas Dilger <adilger@sun.com>
Subject: [PATCH 2/3] vfs: O_* bit numbers uniqueness check fix
Date: Tue, 16 Mar 2010 09:36:55 +0800 [thread overview]
Message-ID: <20100316013841.269383897@intel.com> (raw)
In-Reply-To: 20100316013653.367442879@intel.com
[-- Attachment #1: fcntl_init-O_RDONLY-2 --]
[-- Type: text/plain, Size: 980 bytes --]
Follow the comment by Andreas:
It's non-obvious why there are 18 flags listed here, but the hweight
is only 17? Presumably this is because O_RDONLY has value 0, but that
should at least be
listed in a comment, or the test could be written more explicitly, like:
BUILD_BUG_ON(18 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
CC: Andreas Dilger <adilger@sun.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
fs/fcntl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-mm.orig/fs/fcntl.c 2010-03-16 09:35:47.000000000 +0800
+++ linux-mm/fs/fcntl.c 2010-03-16 09:36:01.000000000 +0800
@@ -742,7 +742,7 @@ EXPORT_SYMBOL(kill_fasync);
static int __init fcntl_init(void)
{
/* please add new bits here to ensure allocation uniqueness */
- BUILD_BUG_ON(17 != HWEIGHT32(
+ BUILD_BUG_ON(18 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
O_RDONLY | O_WRONLY | O_RDWR |
O_CREAT | O_EXCL | O_NOCTTY |
O_TRUNC | O_APPEND | O_NONBLOCK |
next prev parent reply other threads:[~2010-03-16 1:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-16 1:36 [PATCH 0/3] O_* bit numbers uniqueness check patches (V2) Wu Fengguang
2010-03-16 1:36 ` [PATCH 1/3] vfs: O_* bit numbers uniqueness check Wu Fengguang
2010-03-16 1:36 ` Wu Fengguang [this message]
2010-03-16 1:36 ` [PATCH 3/3] vfs: O_* bit numbers uniqueness check fix 2 Wu Fengguang
-- strict thread matches above, loose matches on Subject: below --
2010-03-16 1:08 [PATCH 0/3] O_* bit numbers uniqueness check patches Wu Fengguang
2010-03-16 1:08 ` [PATCH 2/3] vfs: O_* bit numbers uniqueness check fix Wu Fengguang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100316013841.269383897@intel.com \
--to=fengguang.wu@intel.com \
--cc=adilger@sun.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox