From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2EB48C433EF for ; Mon, 20 Dec 2021 14:03:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233256AbhLTODy (ORCPT ); Mon, 20 Dec 2021 09:03:54 -0500 Received: from sin.source.kernel.org ([145.40.73.55]:42370 "EHLO sin.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232505AbhLTODx (ORCPT ); Mon, 20 Dec 2021 09:03:53 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id D5645CE10DA for ; Mon, 20 Dec 2021 14:03:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 271DCC36AED for ; Mon, 20 Dec 2021 14:03:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1640009030; bh=bPKiX+8jJwxqxaprS1JmXvLTrG48KvnlDMVxkN7OFbA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=neci6bJ5ARsw7TZS1v4XYQMlwGD3ZiVOlxc4GNe7v4DjRkqpEKXz4zQsiWp2TDMpw 04dYKK3YfCidzlFI9iaYUl2sdtXh1dmWnfaKxMTNgUetCeUNNu6bKTQsLHgnKRR36m /be8L3FXxeylj9bOlyWqr0XEVdzQ5KGiXmU5NJL/PjdUEoZ0PBLQh3yxG4eJSh9rv1 2FYsKABN4gCe9Y7AGow3th6BAKrTNel/dnZwIJe0LNoFAa577uoUZfiZs7FUGdxtv+ M3sc4MLmTicHJJU+xzQUW6Ht82elcQJFVf0O3tUX5gS9UYH7H/EQJ6dSvrB1o02vpb HrfKMmfMCpllA== Received: by mail-wr1-f50.google.com with SMTP id q16so20325958wrg.7 for ; Mon, 20 Dec 2021 06:03:50 -0800 (PST) X-Gm-Message-State: AOAM533YaYm4oqc89HCdiRRdbm/5YtsfJuUorEZCsJEwIqWsGA4EFBQ+ 6ktNfbsEs8EZTQayv2fSvi8MxRKiEXC7OB7dNVw= X-Google-Smtp-Source: ABdhPJzBpdpvGiiJ4qIik9Z4FCJ+PCqE74SgR6Q/Xbr20R+VLueDh0Qtg/ZmiHZcKIEFZM9TLRIylnJX1GqXS9T0VJI= X-Received: by 2002:adf:c450:: with SMTP id a16mr12436578wrg.454.1640009028187; Mon, 20 Dec 2021 06:03:48 -0800 (PST) MIME-Version: 1.0 References: <20211220140142.922323-1-frederic@kernel.org> In-Reply-To: <20211220140142.922323-1-frederic@kernel.org> From: Ard Biesheuvel Date: Mon, 20 Dec 2021 15:03:36 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [GIT PULL] arm64: Support dynamic preemption v3 To: Frederic Weisbecker Cc: LKML , Steven Rostedt , Peter Zijlstra , Kees Cook , James Morse , David Laight , Sami Tolvanen , Josh Poimboeuf , Andy Lutomirski , Quentin Perret , Catalin Marinas , Will Deacon , Mark Rutland Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Frederic, On Mon, 20 Dec 2021 at 15:01, Frederic Weisbecker wrote: > > Hi, > > I haven't seen much comments on the static key based version from Mark > so I don't know which direction we'll eventually take. I still hope we > can focus on a unified static call based implementation, considering > there are other users waiting on arm64 static calls. > Which other users are you referring to here? > So here is a rebase against the latest tip:sched/core and arm64 static > call proposal. > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > preempt/arm-v4 > > HEAD: 6fc1c7e3d83c4e06b019b041894d9bb25f37ac6c > > Thanks, > Frederic > --- > > Frederic Weisbecker (3): > sched/preempt: Prepare for supporting !CONFIG_GENERIC_ENTRY dynamic preemption > arm64: Implement IRQ exit preemption static call for dynamic preemption > arm64: Implement HAVE_PREEMPT_DYNAMIC > > Ard Biesheuvel (2): > static_call: Use non-function types to refer to the trampolines > arm64: implement support for static call trampolines > > > arch/Kconfig | 1 - > arch/arm64/Kconfig | 3 ++ > arch/arm64/include/asm/preempt.h | 23 ++++++++++- > arch/arm64/include/asm/static_call.h | 40 +++++++++++++++++++ > arch/arm64/kernel/entry-common.c | 15 +++++-- > arch/arm64/kernel/patching.c | 77 ++++++++++++++++++++++++++++++++++-- > arch/arm64/kernel/vmlinux.lds.S | 1 + > include/linux/entry-common.h | 3 +- > include/linux/static_call.h | 4 +- > include/linux/static_call_types.h | 11 ++++-- > kernel/sched/core.c | 6 ++- > 11 files changed, 168 insertions(+), 16 deletions(-)