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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 33738C38142 for ; Tue, 31 Jan 2023 06:41:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:References :In-Reply-To:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vbBJrhmYsAOG19c2P5aBZ2SC+d2C8WfzXT3jiDfC09U=; b=bJSnNjnnkjJjy/ mkCtbqsKhptbZvK/E8G5cZj/WbGRtYfL/YDpboZ0ZDqB7wQYrSuSo+3vNF2w187Lw9H2YwNBWvQ3I gdJvhQUbbHGe9SRHdD4C9Juc9Wt+D60SH6+W3Wh/eDFEmJzyUcjidmw4mbC0HxSIUJYXdmLbw4q5n bUrs4S+prJERpQOraTgugNFrUZlCj9SHHZsvqgOqT5M04omU2sebwl/Tkho6YuOrIlCdW0or1UsQH /Qv90b1CiYscVH4hcQHo7XFG9d+vFwU5zO0mdoQEMDfWcjnwB0g2diOb358MEEqVBj/noW27JeAai Ln1FXf4BTLlg1RrPWC+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMkJz-006U3D-SB; Tue, 31 Jan 2023 06:40:47 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMkJw-006U2N-OY for linux-riscv@lists.infradead.org; Tue, 31 Jan 2023 06:40:46 +0000 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 ams.source.kernel.org (Postfix) with ESMTPS id 5BCF1B819FE; Tue, 31 Jan 2023 06:40:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7208C433D2; Tue, 31 Jan 2023 06:40:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675147243; bh=HGGqP/Pod6SsODLD3CZR2XKgRMAKC38fnBK/HFU5oRE=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=et1PKkGleQIe9Ebmz0wVxWaM3B6pL2quMxKzOs8ddeE8+fDpa2JLiEN8tdlsEwSt+ r2B5gMlZw9Yaeey/RewYXbzL/4TWBByH/6K3kO2popDXT3jk4eIExkxnhOZWdgjVM1 3S78lKkvZc1fLNBjrl2x9ICdxUCI5U4vBtMZy5k9IpbaM2ACIsJqHCiahbFmXOYQwr OoF5AcMbqBYOfQsP0QkWnXL4SXUQWpGR53GGkhcGaKknFIWe6QQWe0k4uAwmZafGMe yia0qaODJ5Mg7WLM1Xw+ogniiVH44P5OCeRnUOiqninWIRulyduExZ3bYkK4AcTc6O Whk21Szhc2EjQ== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: Guo Ren Cc: "liaochang (A)" , palmer@dabbelt.com, paul.walmsley@sifive.com, mhiramat@kernel.org, conor.dooley@microchip.com, penberg@kernel.org, mark.rutland@arm.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Guo Ren Subject: Re: [PATCH] riscv: kprobe: Optimize kprobe with accurate atomicity In-Reply-To: References: <20230126161559.1467374-1-guoren@kernel.org> <0abbbdd4-6b85-9659-03ee-97c56a5b77c1@huawei.com> <87r0vc9h4g.fsf@all.your.base.are.belong.to.us> Date: Tue, 31 Jan 2023 07:40:40 +0100 Message-ID: <87ilgntdef.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230130_224045_100474_202A70AA X-CRM114-Status: GOOD ( 21.86 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org R3VvIFJlbiA8Z3VvcmVuQGtlcm5lbC5vcmc+IHdyaXRlczoKCj4gT24gTW9uLCBKYW4gMzAsIDIw MjMgYXQgMTE6MjggUE0gQmrDtnJuIFTDtnBlbCA8Ympvcm5Aa2VybmVsLm9yZz4gd3JvdGU6Cj4+ Cj4+IEd1byBSZW4gPGd1b3JlbkBrZXJuZWwub3JnPiB3cml0ZXM6Cj4+Cj4+ID4+IEluIHRoZSBz ZXJpZSBvZiBSSVNDViBPUFRQUk9CRVMgWzFdLCBpdCBwYXRjaGVzIGEgbG9uZy1qdW1wIGluc3Ry dWN0aW9ucyBwYWlyCj4+ID4+IEFVSVBDL0pBTFIgaW4ga2VybmVsIHRleHQsIHNvIGluIG9yZGVy IHRvIGVuc3VyZSBvdGhlciBDUFVzIGRvZXMgbm90IGV4ZWN1dGUKPj4gPj4gaW4gdGhlIGluc3Ry dWN0aW9ucyB0aGF0IHdpbGwgYmUgbW9kaWZpZWQsIGl0IGlzIHN0aWxsIG5lZWQgdG8gc3RvcCBv dGhlciBDUFVzCj4+ID4+IHZpYSBwYXRjaF90ZXh0IEFQSSwgb3IgeW91IGhhdmUgYW55IGJldHRl ciBzb2x1dGlvbiB0byBhY2hpZXZlIHRoZSBwdXJwb3NlPwo+PiA+ICAtIFRoZSBzdG9wX21hY2hp bmUgaXMgYW4gZXhwZW5zaXZlIHdheSBhbGwgYXJjaGl0ZWN0dXJlcyBzaG91bGQKPj4gPiBhdm9p ZCwgYW5kIHlvdSBjb3VsZCBrZWVwIHRoYXQgaW4geW91ciBPUFRQUk9CRVMgaW1wbGVtZW50YXRp b24gZmlsZXMKPj4gPiB3aXRoIHN0YXRpYyBmdW5jdGlvbnMuCj4+ID4gIC0gVGhlIHN0b3BfbWFj aGluZSBjb3VsZG4ndCB3b3JrIHdpdGggUFJFRU1QVElPTiwgc28geW91cgo+PiA+IGltcGxlbWVu dGF0aW9uIG5lZWRzIHRvIHdvcmsgd2l0aCAhUFJFRU1QVElPTi4KPj4KPj4gLi4uYW5kIHN0b3Bf bWFjaGluZSgpIHdpdGggIVBSRUVNUFRJT04gaXMgYnJva2VuIGFzIHdlbGwsIHdoZW4geW91J3Jl Cj4+IHJlcGxhY2luZyBtdWx0aXBsZSBpbnN0cnVjdGlvbnMgKHNlZSBNYXJrJ3MgcG9zdCBhdCBb MV0pLiBUaGUKPj4gc3RvcF9tYWNoaW5lKCkgZGFuY2UgbWlnaHQgd29yayB3aGVuIHlvdSdyZSBy ZXBsYWNpbmcgKm9uZSogaW5zdHJ1Y3Rpb24sCj4+IG5vdCBtdWx0aXBsZSBhcyBpbiB0aGUgUklT Qy1WIGNhc2UuIEknbGwgZXhwYW5kIG9uIHRoaXMgaW4gYSBjb21tZW50IGluCj4+IHRoZSBPUFRQ Uk9CRVMgdjYgc2VyaWVzLgo+Pgo+PiA+PiA+ICBzdGF0aWMgdm9pZCBfX2twcm9iZXMgYXJjaF9w cmVwYXJlX3NpbXVsYXRlKHN0cnVjdCBrcHJvYmUgKnApCj4+ID4+ID4gQEAgLTExNCwxNiArMTIw LDIzIEBAIHZvaWQgKmFsbG9jX2luc25fcGFnZSh2b2lkKQo+PiA+PiA+ICAvKiBpbnN0YWxsIGJy ZWFrcG9pbnQgaW4gdGV4dCAqLwo+PiA+PiA+ICB2b2lkIF9fa3Byb2JlcyBhcmNoX2FybV9rcHJv YmUoc3RydWN0IGtwcm9iZSAqcCkKPj4gPj4gPiAgewo+PiA+PiA+IC0gICAgIGlmICgocC0+b3Bj b2RlICYgX19JTlNOX0xFTkdUSF9NQVNLKSA9PSBfX0lOU05fTEVOR1RIXzMyKQo+PiA+PiA+IC0g ICAgICAgICAgICAgcGF0Y2hfdGV4dChwLT5hZGRyLCBfX0JVR19JTlNOXzMyKTsKPj4gPj4gPiAt ICAgICBlbHNlCj4+ID4+ID4gLSAgICAgICAgICAgICBwYXRjaF90ZXh0KHAtPmFkZHIsIF9fQlVH X0lOU05fMTYpOwo+PiA+PiA+ICsjaWZkZWYgQ09ORklHX1JJU0NWX0lTQV9DCj4+ID4+ID4gKyAg ICAgdTMyIG9wY29kZSA9IF9fQlVHX0lOU05fMTY7Cj4+ID4+ID4gKyNlbHNlCj4+ID4+ID4gKyAg ICAgdTMyIG9wY29kZSA9IF9fQlVHX0lOU05fMzI7Cj4+ID4+ID4gKyNlbmRpZgo+PiA+PiA+ICsg ICAgIHBhdGNoX3RleHRfbm9zeW5jKHAtPmFkZHIsICZvcGNvZGUsIEdFVF9JTlNOX0xFTkdUSChv cGNvZGUpKTsKPj4gPj4KPj4gPj4gU291bmRzIGdvb2QsIGJ1dCBpdCB3aWxsIGxlYXZlIHNvbWUg UlZJIGluc3RydWN0aW9uIHRydW5jYXRlZCBpbiBrZXJuZWwgdGV4dCwKPj4gPj4gaSBkb3VidCBr ZXJuZWwgYmVoYXZpb3IgZGVwZW5kcyBvbiB0aGUgcmVzdCBvZiB0aGUgdHJ1bmNhdGVkIGluc3Ry dWN0aW9uLCB3ZWxsLAo+PiA+PiBpdCBuZWVkcyBtb3JlIHN0cmljdCB0ZXN0aW5nIHRvIHByb3Zl IG15IGNvbmNlcm4gOikKPj4gPiBJIGRvIHRoaXMgb24gcHVycG9zZSwgYW5kIGl0IGRvZXNuJ3Qg Y2F1c2UgYW55IHByb2JsZW1zLiBEb24ndCB3b3JyeTsKPj4gPiBJRlUgaHcgbXVzdCBlbmZvcmNl IHRoZSBmZXRjaCBzZXF1ZW5jZSwgYW5kIHRoZXJlIGlzIG5vIHdheSB0byBleGVjdXRlCj4+ID4g YnJva2VuIGluc3RydWN0aW9ucyBldmVuIGluIHRoZSBzcGVjdWxhdGl2ZSBleGVjdXRpb24gcGF0 aC4KPj4KPj4gVGhpcyBpcyBzdHJldGNoaW5nIHJlYWxpdHkgYSBiaXQgbXVjaC4gQVJNdjgsIGUu Zy4sIGhhcyBhIGNoYXB0ZXIgaW4gdGhlCj4+IEFybSBBUk0gWzJdIEFwcGVuZGl4IEIgIkNvbmN1 cnJlbnQgbW9kaWZpY2F0aW9uIGFuZCBleGVjdXRpb24gb2YKPj4gaW5zdHJ1Y3Rpb25zIiAoQ01P RFgpLiAqU29tZSogaW5zdHJ1Y3Rpb25zIGNhbiBiZSByZXBsYWNlZCBjb25jdXJyZW50bHksCj4+ IGFuZCBvdGhlcnMgY2Fubm90IHdpdGhvdXQgY2F1dGlvbi4gQXNzdW1pbmcgdGhhdCB0aGF0IGFs bCBSSVNDLVYKPj4gaW1wbGVtZW50YXRpb25zIGNhbiwgaXMgYSBzdHJldGNoLiBSSVNDLVYgaGFz bid0IGV2ZW4gc3BlY2lmaWVkIHRoZQo+PiBiZWhhdmlvciBvZiBDTU9EWCAod2hpY2ggaXMgcHJv YmxlbWF0aWMpLgo+IEhlcmUgd2Ugb25seSB1c2Ugb25lIHN3L3NoIGluc3RydWN0aW9uIHRvIHN0 b3JlIGEgMzJiaXQvMTZiaXQgYWxpZ25lZCBlbGVtZW50Ogo+Cj4gSU5TTl8wIDwtIGVicmVhayAo MTZiaXQvMzJiaXQgYWxpZ25lZCkKPiBJTlNOXzEKPiBJTlNOXzIKPgo+IFRoZSBlYnJlYWsgd291 bGQgY2F1c2UgYW4gZXhjZXB0aW9uIHdoaWNoIGltcGxpZXMgYSBodWdlIGZlbmNlIGhlcmUuCj4g Tm8gbWFjaGluZSBjb3VsZCBnaXZlIGEgc3BlY3VsYXRpdmUgZXhlY3V0aW9uIGZvciB0aGUgZWJy ZWFrIHBhdGguCgpJdCdzIHRoZSBjb25jdXJyZW50IG1vZGlmaWNhdGlvbiB0aGF0IEkgd2FzIHJl ZmVycmluZyB0byAocmVtb3ZpbmcKc3RvcF9tYWNoaW5lKCkpLiBZb3UncmUgc2F5aW5nICJpdCds bCBhbHdheXMgd29yayIsIEknbSBzYXlpbmcgIkknbSBub3QKc28gc3VyZSIuIDotKSBFLmcuLCB3 cml0aW5nIGMuZWJyZWFrIG9uIGFuIDMyYiBpbnNuLiBDYW4geW91IHNheSB0aGF0CndpbGwgd29y ayBvbiBhbGwgUklTQy1WIGltcGxlbWVudGF0aW9ucz8gRG8geW91IGhhdmUgZXhhbXBsZXMgb2YK aGFyZHdhcmUgd2hlcmUgaXQgd2lsbCB3b3JrPwoKCkJqw7ZybgoKX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0Cmxp bnV4LXJpc2N2QGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1yaXNjdgo=