From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BBC71B3B32; Fri, 27 Sep 2024 23:07:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=167.114.26.122 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727478482; cv=none; b=F74CUMDcbz9I7ICctWScdgRg3m9GBM//vCM0cRe7XSo0s+BLPTjaNHXvsMisE62xq/dGrAOlyWYUZ2QDfUDQKnmBl3cIcAGFCgNyLuV1MzbC6qE0Jprz4qGig9iuKJA68NhL2w7UBfSyFd932yvJMBA4aDe3T4CgZZh+PWoinM4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727478482; c=relaxed/simple; bh=vZdofi7hPf6lEnQiTIeeDsfTwH6BQfwxwcUvBX4YTf8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cBi+d+gwA4VPfItcjx4A6ZrUX+uxtNtSj+EWKt9oY/bfetahLhiYJs0/OpZ4enfozSzmDU3VwNYcOXOYci5S3R1g1yE3oOIiLvRHMcsDg1hBJSFBUnX6XgbCYr3KWc6aeNkPdN4ldNIehrskFs6kicIF3MjgZFOgnvTqGaw6oq8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com; spf=pass smtp.mailfrom=efficios.com; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b=JaDhKX5p; arc=none smtp.client-ip=167.114.26.122 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=efficios.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=efficios.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=efficios.com header.i=@efficios.com header.b="JaDhKX5p" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1727478478; bh=vZdofi7hPf6lEnQiTIeeDsfTwH6BQfwxwcUvBX4YTf8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JaDhKX5pM0In4h3su150xOzDBPpxzztbO9HMj1WTFaMEPMaSQEo64Zw3TGTcGOpd7 N1Fpz6PBXVflxj0OcasuQvF/8b0lhpwPxC7qwp5MdFRKKbC7+O7yKx/hMrgc5BlBuX h+b5sFhF7GttU/hrbDe9gD6L7gcto0ezXD+523XZf45FTjj0EDxaH2FsUvG1LH0EfK eq6bXxQmSM5SCwB75HDbciW6a2oLpETWgAWDjvDFfjYNabqald4gVJuH992zh4nXet Gtdlz3ARXpqdq+fb5I/X8XM0R0OLDpUOL+G0AknFdRas+0bKrRSLV0tck9Bok9ei9z /rBlmqnfp6Sww== Received: from [IPV6:2606:6d00:100:4000:cacb:9855:de1f:ded2] (unknown [IPv6:2606:6d00:100:4000:cacb:9855:de1f:ded2]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4XFmMy4yh7z1SwZ; Fri, 27 Sep 2024 19:07:58 -0400 (EDT) Message-ID: <23882bd6-c0e0-4f6c-9000-b79216194198@efficios.com> Date: Fri, 27 Sep 2024 19:05:53 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] compiler.h: Introduce ptr_eq() to preserve address dependency To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Boqun Feng , Greg Kroah-Hartman , Sebastian Andrzej Siewior , "Paul E. McKenney" , Will Deacon , Peter Zijlstra , Alan Stern , John Stultz , Neeraj Upadhyay , Frederic Weisbecker , Joel Fernandes , Josh Triplett , Uladzislau Rezki , Steven Rostedt , Lai Jiangshan , Zqiang , Ingo Molnar , Waiman Long , Mark Rutland , Thomas Gleixner , Vlastimil Babka , maged.michael@gmail.com, Mateusz Guzik , rcu@vger.kernel.org, linux-mm@kvack.org, lkmm@lists.linux.dev References: <20240927203334.976821-1-mathieu.desnoyers@efficios.com> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: <20240927203334.976821-1-mathieu.desnoyers@efficios.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2024-09-27 22:33, Mathieu Desnoyers wrote: [...] > --- > include/linux/compiler.h | 62 ++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 62 insertions(+) > I'm wondering if this really belongs in compiler.h, or if it's so RCU/HP specific that it should be implemented in rcupdate.h ? [... ] > +static __always_inline > +int ptr_eq(const volatile void *a, const volatile void *b) And perhaps rename this to rcu_ptr_eq() ? Thanks, Mathieu > +{ > + OPTIMIZER_HIDE_VAR(a); > + OPTIMIZER_HIDE_VAR(b); > + return a == b; > +} > + -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com