Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934992Ab0BZB6f (ORCPT ); Thu, 25 Feb 2010 20:58:35 -0500 Received: from mail-ww0-f46.google.com ([74.125.82.46]:49826 "EHLO mail-ww0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934924Ab0BZB6e (ORCPT ); Thu, 25 Feb 2010 20:58:34 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=elqKDHVX3fcT/ubuWxpF533EPpZevrnCgp8pgxmcyh12H9YGwdOciRpZZlAreQ7a9U nxoZDUFOPxOl03F0TcymAH4kc214Ni+A9Clw6Pcmt/WtbDyuJbZC10vEmSp9iZtKPKD9 Ru44hCckHXPfjGiHSHrIMZ+rdwnJDkKprWF/Y= MIME-Version: 1.0 In-Reply-To: <1267114634.22519.0.camel@laptop> References: <20100225154549.GA2710@darkstar> <1267114634.22519.0.camel@laptop> Date: Fri, 26 Feb 2010 09:58:31 +0800 Message-ID: Subject: Re: [PATCH 07/07] printk delay per multi lines From: Dave Young To: Peter Zijlstra Cc: Randy Dunlap , Ingo Molnar , Andrew Morton , Jiri Kosina , Martin Schwidefsky , Hans-Joachim Picht , Simon Kagstrom , David Woodhouse , James Morris , "Eric W. Biederman" , Catalin Marinas , "Paul E. McKenney" , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Content-Type: multipart/mixed; boundary=0016e6d64177818dff0480773c44 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12357 Lines: 186 --0016e6d64177818dff0480773c44 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Fri, Feb 26, 2010 at 12:17 AM, Peter Zijlstra wro= te: > On Thu, 2010-02-25 at 23:45 +0800, Dave Young wrote: >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (!atomic_read(&l)) >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 atomic_set(&l, printk_delay_lines); > > That's racy, use atomic_cmpxchg() > >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 smp_mb__before_atomic= _dec(); >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (atomic_dec_return= (&l)) >> + =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 return; > > What's that barrier for? > > Thanks for review. Here is the fixed version, sorry for using attachment --=20 Regards dave --0016e6d64177818dff0480773c44 Content-Type: text/x-patch; charset=US-ASCII; name="07_printk_delay.patch" Content-Disposition: attachment; filename="07_printk_delay.patch" Content-Transfer-Encoding: base64 X-Attachment-Id: f_g64c2a3j0 cHJpbnRrIGRlbGF5IGhlbHAgdXMgdG8gY2FwdHVyZSBwcmludGsgbWVzc2FnZXMgb24gc29tZSB1 bmNvbnZlbmllbnQgc2VuYXJpb3MsCmllLiBvbiBoYWx0IHBoYXNlLiBCdXQgdGhlIG1lc3NhZ2Vz IGlzIHN0aWxsIG5vdCBlYXN5IHRvIHJlYWQuCgpTbyB0aGlzIHBhdGNoIGFkZCBhbm90aGVyIHN5 c2N0bCB2YXJpYWJsZSBwcmludGtfZGVsYXlfbGluZXMgdG8KbWFrZSB0aGUgbWVzc2FnZXMgY2Fu IGJlIGRlbGF5ZWQgYWZ0ZXIgbXVsdGkgcHJpbnRrcy4gVGh1cyB3ZSBjYW4KdGFrZSBwaWN0dXJl cyBieSBjYW1lcmEgZWFzaWx5IGFuZCB0aGUgbWVzc2FnZXMgd2lsbCBiZSBtb3JlIHJlYWRhYmxl LgoKa21lc2cgd2lsbCBkZWxheSBwcmludGtfZGVsYXlfbXNlY3MgbWlsbGlzZWNvbmRzCmFmdGVy IGV2ZXJ5IHByaW50a19kZWxheV9saW5lcyBwcmludGtzIHdoZW4gcHJpbnRrX2RlbGF5ID4gMC4K CkFkZGl0aW9uYWwsIG1lcmdlIGJvb3RfZGVsYXkgaW50byBwcmludGtfZGVsYXkgZnVuY3Rpb24u 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