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:	Tue, 27 Jul 2010 15:39:06 -0700
From:	Patrick Pannuto <ppannuto@...eaurora.org>
To:	linux-kernel@...r.kernel.org
Cc:	ppannuto@...eaurora.org, Andy Whitcroft <apw@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>
Subject: [PATCH 3/4] Checkpatch: prefer usleep_range over usleep

In (almost) every case, usleep_range is better than
usleep, as the precise (ish) wakeup - more accurately
the extra interrupt - from usleep is unnecessary.

usleep_range gives a much better chance of coalescing
processor wakeups.

Signed-off-by: Patrick Pannuto <ppannuto@...eaurora.org>
---
 scripts/checkpatch.pl |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e3625ac..0650ab9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2578,6 +2578,11 @@ sub process {
 			}
 		}
 
+# prefer usleep_range over usleep
+		if ($line =~ /\busleep\s*\(.+\);/) {
+			WARN("usleep_range is preferred over usleep; see Documentation/timers/delays.txt\n" . $line);
+		}
+
 # warn about #ifdefs in C files
 #		if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
 #			print "#ifdef in C files should be avoided\n";
-- 
1.7.2

--
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/

Powered by blists - more mailing lists