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 C32E6C636CC for ; Tue, 31 Jan 2023 10:40:04 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OwbQ39kA29/xUellqy1bzHhKgGLltTjN1JzF9g9RyeY=; b=O9RMM2hpMqDThy 4BzRcGPROE0wWcEpRzJp/uXWV5+RpvYE/FnmCJCSlLbj6epHuER5Zmg7P+SrWnEtymP6NljtRwx6E BrcYmlB49ZZX2QrALNRWsjdxQrbKtmQBOwbQjyktMy5v+078Zz/7pkeTTGKoJDbi7EsLFfcf0Ka30 EeRq95+DwxqW2MG1blM0abi4wCPxXvfOJceq07BaAjU81f1EMrsETNuOQG334ot38CXrhJteabjqg Ui3TsPLm3WZ0O91wFTNq/lL056Lm7JeHMoDdgYUr2nqnKD1k0ra3T6xVEPOQFQqhMNhmML8QuT/Mr 4E6EftQeVDd3WfoWvjQA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMo3O-007ULh-UW; Tue, 31 Jan 2023 10:39:54 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pMnxW-007RgP-6X for linux-riscv@bombadil.infradead.org; Tue, 31 Jan 2023 10:33:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=NOngKMrIigypgZEhbdUNEnz4nTQSNbBmMRTpNk/9MdI=; b=MvoCukJTV1nQ6v9IBiJ6q1x/e7 R1GmzcZ8afPJHCdeUmDJt0KxRlgsdqvfwKmKYzwrmd9VjWjGwvp85xREFNC3ruuq206Eg+emrUGEg wbMZl6EwWpTBNYZpZIQeJNAQnaifHHijE0bus7brrCBHcGRMkpsXlQt8x8UiOEhQrM4F57S7mrJXU pdP0E99eAQcl5CIP8qfuT1fumL+RPQGg03Y7wUSHfDW8NGoRAqhRDO2TW8znXQp+NQSxS5WOttw1u 4rU7Ru6Z1pWhdLZbWZHR2z4hDyYttI+Vk/wyrGBNx99iILPEJuF1BKw1iTt2jGVr9Y+rODMrAAaj5 swemAzpw==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pMnws-004Jsv-02 for linux-riscv@lists.infradead.org; Tue, 31 Jan 2023 10:33:14 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 26EA32F4; Tue, 31 Jan 2023 02:33:52 -0800 (PST) Received: from FVFF77S0Q05N (unknown [10.57.12.254]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4FC3A3F64C; Tue, 31 Jan 2023 02:33:08 -0800 (PST) Date: Tue, 31 Jan 2023 10:33:05 +0000 From: Mark Rutland To: Guo Ren Cc: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , "liaochang (A)" , palmer@dabbelt.com, paul.walmsley@sifive.com, mhiramat@kernel.org, conor.dooley@microchip.com, penberg@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Guo Ren Subject: Re: [PATCH] riscv: kprobe: Optimize kprobe with accurate atomicity Message-ID: References: <20230126161559.1467374-1-guoren@kernel.org> <0abbbdd4-6b85-9659-03ee-97c56a5b77c1@huawei.com> <87r0vc9h4g.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230131_103310_565006_E99F6B63 X-CRM114-Status: GOOD ( 27.69 ) 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 T24gVHVlLCBKYW4gMzEsIDIwMjMgYXQgMDk6NDg6MjlBTSArMDgwMCwgR3VvIFJlbiB3cm90ZToK PiBPbiBNb24sIEphbiAzMCwgMjAyMyBhdCAxMTo0OSBQTSBNYXJrIFJ1dGxhbmQgPG1hcmsucnV0 bGFuZEBhcm0uY29tPiB3cm90ZToKPiA+Cj4gPiBIaSBCam9ybiwKPiA+Cj4gPiBPbiBNb24sIEph biAzMCwgMjAyMyBhdCAwNDoyODoxNVBNICswMTAwLCBCasO2cm4gVMO2cGVsIHdyb3RlOgo+ID4g PiBHdW8gUmVuIDxndW9yZW5Aa2VybmVsLm9yZz4gd3JpdGVzOgo+ID4gPgo+ID4gPiA+PiBJbiB0 aGUgc2VyaWUgb2YgUklTQ1YgT1BUUFJPQkVTIFsxXSwgaXQgcGF0Y2hlcyBhIGxvbmctanVtcCBp bnN0cnVjdGlvbnMgcGFpcgo+ID4gPiA+PiBBVUlQQy9KQUxSIGluIGtlcm5lbCB0ZXh0LCBzbyBp biBvcmRlciB0byBlbnN1cmUgb3RoZXIgQ1BVcyBkb2VzIG5vdCBleGVjdXRlCj4gPiA+ID4+IGlu IHRoZSBpbnN0cnVjdGlvbnMgdGhhdCB3aWxsIGJlIG1vZGlmaWVkLCBpdCBpcyBzdGlsbCBuZWVk IHRvIHN0b3Agb3RoZXIgQ1BVcwo+ID4gPiA+PiB2aWEgcGF0Y2hfdGV4dCBBUEksIG9yIHlvdSBo YXZlIGFueSBiZXR0ZXIgc29sdXRpb24gdG8gYWNoaWV2ZSB0aGUgcHVycG9zZT8KPiA+ID4gPiAg LSBUaGUgc3RvcF9tYWNoaW5lIGlzIGFuIGV4cGVuc2l2ZSB3YXkgYWxsIGFyY2hpdGVjdHVyZXMg c2hvdWxkCj4gPiA+ID4gYXZvaWQsIGFuZCB5b3UgY291bGQga2VlcCB0aGF0IGluIHlvdXIgT1BU UFJPQkVTIGltcGxlbWVudGF0aW9uIGZpbGVzCj4gPiA+ID4gd2l0aCBzdGF0aWMgZnVuY3Rpb25z Lgo+ID4gPiA+ICAtIFRoZSBzdG9wX21hY2hpbmUgY291bGRuJ3Qgd29yayB3aXRoIFBSRUVNUFRJ T04sIHNvIHlvdXIKPiA+ID4gPiBpbXBsZW1lbnRhdGlvbiBuZWVkcyB0byB3b3JrIHdpdGggIVBS RUVNUFRJT04uCj4gPiA+Cj4gPiA+IC4uLmFuZCBzdG9wX21hY2hpbmUoKSB3aXRoICFQUkVFTVBU SU9OIGlzIGJyb2tlbiBhcyB3ZWxsLCB3aGVuIHlvdSdyZQo+ID4gPiByZXBsYWNpbmcgbXVsdGlw bGUgaW5zdHJ1Y3Rpb25zIChzZWUgTWFyaydzIHBvc3QgYXQgWzFdKS4gVGhlCj4gPiA+IHN0b3Bf bWFjaGluZSgpIGRhbmNlIG1pZ2h0IHdvcmsgd2hlbiB5b3UncmUgcmVwbGFjaW5nICpvbmUqIGlu c3RydWN0aW9uLAo+ID4gPiBub3QgbXVsdGlwbGUgYXMgaW4gdGhlIFJJU0MtViBjYXNlLiBJJ2xs IGV4cGFuZCBvbiB0aGlzIGluIGEgY29tbWVudCBpbgo+ID4gPiB0aGUgT1BUUFJPQkVTIHY2IHNl cmllcy4KPiA+Cj4gPiBKdXN0IHRvIGNsYXJpZnksIG15IGNvbW1lbnRzIGluIFsxXSB3ZXJlIGFz c3VtaW5nIHRoYXQgc3RvcF9tYWNoaW5lKCkgd2FzIG5vdAo+ID4gdXNlZCwgaW4gd2hpY2ggY2Fz ZSB0aGVyZSBpcyBhIHByb2JsZW0gd2l0aCBvciB3aXRob3V0IFBSRUVNUFRJT04uCj4gPgo+ID4g SSBiZWxpZXZlIHRoYXQgd2hlbiB1c2luZyBzdG9wX21hY2hpbmUoKSwgdGhlICFQUkVFTVBUSU9O IGNhc2UgaXMgZmluZSwgc2luY2UKPiA+IHN0b3BfbWFjaGluZSgpIHNjaGVkdWxlcyB3b3JrIHJh dGhlciB0aGFuIHJ1bm5pbmcgd29yayBpbiBJUlEgY29udGV4dCBvbiB0aGUKPiA+IGJhY2sgb2Yg YW4gSVBJLCBzbyBubyBDUFVzIHNob3VsZCBiZSBtaWQtc2VxdW5jZSBkdXJpbmcgdGhlIHBhdGNo aW5nLCBhbmQgaXQncwo+ID4gbm90IHBvc3NpYmxlIGZvciB0aGVyZSB0byBiZSB0aHJlYWRzIHdo aWNoIGFyZSBwcmVlbXB0ZWQgbWlkLXNlcXVlbmNlLgo+ID4KPiA+IFRoYXQgYWxsIHNhaWQsIElJ VUMgb3B0cHJvYmVzIGlzIGdvaW5nIHRvIGRpc2FwcGVhciBvbmNlIGZwcm9iZSBpcyByZWFkeQo+ ID4gZXZlcnl3aGVyZSwgc28gdGhhdCBtaWdodCBiZSBtb290Lgo+IFRoZSBvcHRwcm9iZXMgY291 bGQgYmUgaW4gdGhlIG1pZGRsZSBvZiBhIGZ1bmN0aW9uLCBidXQgZnByb2JlIG11c3QgYmUKPiB0 aGUgZW50cnkgb2YgYSBmdW5jdGlvbiwgcmlnaHQ/Cj4gCj4gRG9lcyB5b3VyIGZwcm9iZSBoZXJl IG1lYW46ID8KPiAKPiBUaGUgTGludXgga2VybmVsIGNvbmZpZ3VyYXRpb24gaXRlbSBDT05GSUdf RlBST0JFOgo+IAo+IHByb21wdDogS2VybmVsIEZ1bmN0aW9uIFByb2JlIChmcHJvYmUpCj4gdHlw ZTogYm9vbAo+IGRlcGVuZHMgb246ICggQ09ORklHX0ZVTkNUSU9OX1RSQUNFUiApICYmICgKPiBD T05GSUdfRFlOQU1JQ19GVFJBQ0VfV0lUSF9SRUdTICkgJiYgKCBDT05GSUdfSEFWRV9SRVRIT09L ICkKPiBkZWZpbmVkIGluIGtlcm5lbC90cmFjZS9LY29uZmlnCgpZZXMuCgpNYXNhbWksIFN0ZXZl LCBhbmQgSSBoYWQgYSBjaGF0IGF0IHRoZSB0cmFjaW5nIHN1bW1pdCBsYXRlIGxhc3QgeWVhciAo d2hpY2gKdW5mb3J0dW5hdGVseSwgd2FzIG5vdCByZWNvcmRlZCksIGFuZCB3aGF0IHdlJ2QgbGlr ZSB0byBkbyBpcyBnZXQgZWFjaAphcmNoaXRlY3R1cmUgdG8gaGF2ZSBGUFJPQkUgKGFuZCBGVFJB Q0VfV0lUSF9BUkdTKSwgYXQgd2hpY2ggcG9pbnQgT1BUUFJPQkUKYW5kIEtSRVRQUk9CRSBiZWNv bWUgcmVkdW5kYW50IGFuZCBjb3VsZCBiZSByZW1vdmVkLgoKaS5lLiB3ZSdkIGtlZXAgS1BST0JF UyBhcyBhICJ5b3UgY2FuIHRyYWNlIGFueSBpbnN0cnVjdGlvbiIgZmVhdHVyZSwgYnV0IGluIHRo ZQpmZXcgY2FzZXMgd2hlcmUgT1BUUFJPQkVTIGNhbiBtYWtlIHRoaW5ncyBmYXRlciBieSB1c2lu ZyBGVFJBQ0UsIHlvdSBzaG91bGQKanVzdCB1c2UgdGhhdCBkaXJlY3RseSB2aWEgRlBST0JFLgoK VGhhbmtzLApNYXJrLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmluZnJhZGVh ZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1y aXNjdgo=