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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n5qtJ-004PgS-2d; Fri, 07 Jan 2022 15:10:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n5qtF-004Pfc-Pm for linux-arm-kernel@lists.infradead.org; Fri, 07 Jan 2022 15:10:51 +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 EA68E13D5; Fri, 7 Jan 2022 07:10:48 -0800 (PST) Received: from [10.57.38.163] (unknown [10.57.38.163]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E86033F66F; Fri, 7 Jan 2022 07:10:46 -0800 (PST) Subject: Re: [PATCH 2/3] coresight: Fail to open with return stacks if they are unavailable From: James Clark To: Suzuki K Poulose , coresight@lists.linaro.org Cc: Mike Leach , Leo Yan , John Garry , Will Deacon , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Mathieu Poirier References: <20211208160907.749482-1-james.clark@arm.com> <20211208160907.749482-2-james.clark@arm.com> Message-ID: <70b562dc-adcd-da34-3811-ff872bc7cab8@arm.com> Date: Fri, 7 Jan 2022 15:10:45 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220107_071049_954989_E88F5716 X-CRM114-Status: GOOD ( 23.39 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpPbiAwOS8xMi8yMDIxIDExOjEzLCBKYW1lcyBDbGFyayB3cm90ZToKPiAKPiAKPiBPbiAwOS8x Mi8yMDIxIDExOjAwLCBTdXp1a2kgSyBQb3Vsb3NlIHdyb3RlOgo+PiBPbiAwOC8xMi8yMDIxIDE2 OjA5LCBKYW1lcyBDbGFyayB3cm90ZToKPj4+IE1haW50YWluIGNvbnNpc3RlbmN5IHdpdGggdGhl IG90aGVyIG9wdGlvbnMgYnkgZmFpbGluZyB0byBvcGVuIHdoZW4gdGhleQo+Pj4gYXJlbid0IHN1 cHBvcnRlZC4gRm9yIGV4YW1wbGUgRVRNX09QVF9UUywgRVRNX09QVF9DVFhUSUQyIGFuZCB0aGUg bmV3bHkKPj4+IGFkZGVkIEVUTV9PUFRfQlJBTkNIX0JST0FEQ0FTVCBhbGwgcmV0dXJuIHdpdGgg LUVJTlZBTCBpZiB0aGV5IGFyZQo+Pj4gcmVxdWVzdGVkIGJ1dCBub3Qgc3VwcG9ydGVkIGJ5IGhh cmR3YXJlLgo+Pj4KPj4+IFRoZSBjb25zZXF1ZW5jZSBvZiBub3QgZG9pbmcgdGhpcyBpcyB0aGF0 IHRoZSB1c2VyIG1heSBub3QgYmUKPj4+IGF3YXJlIHRoYXQgdGhleSBhcmUgbm90IGVuYWJsaW5n IHRoZSBmZWF0dXJlIGFzIGl0IGlzIHNpbGVudGx5IGRpc2FibGVkLgo+Pj4KPj4+IFNpZ25lZC1v ZmYtYnk6IEphbWVzIENsYXJrIDxqYW1lcy5jbGFya0Bhcm0uY29tPgo+Pj4gLS0tCj4+PiDCoCBk cml2ZXJzL2h3dHJhY2luZy9jb3Jlc2lnaHQvY29yZXNpZ2h0LWV0bTR4LWNvcmUuYyB8IDEzICsr KysrKysrKy0tLS0KPj4+IMKgIDEgZmlsZSBjaGFuZ2VkLCA5IGluc2VydGlvbnMoKyksIDQgZGVs ZXRpb25zKC0pCj4+Pgo+Pj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvaHd0cmFjaW5nL2NvcmVzaWdo dC9jb3Jlc2lnaHQtZXRtNHgtY29yZS5jIGIvZHJpdmVycy9od3RyYWNpbmcvY29yZXNpZ2h0L2Nv cmVzaWdodC1ldG00eC1jb3JlLmMKPj4+IGluZGV4IGQyYmFmYjUwYzY2YS4uMGE5YmI5NDNhNWU1 IDEwMDY0NAo+Pj4gLS0tIGEvZHJpdmVycy9od3RyYWNpbmcvY29yZXNpZ2h0L2NvcmVzaWdodC1l dG00eC1jb3JlLmMKPj4+ICsrKyBiL2RyaXZlcnMvaHd0cmFjaW5nL2NvcmVzaWdodC9jb3Jlc2ln aHQtZXRtNHgtY29yZS5jCj4+PiBAQCAtNjc0LDEwICs2NzQsMTUgQEAgc3RhdGljIGludCBldG00 X3BhcnNlX2V2ZW50X2NvbmZpZyhzdHJ1Y3QgY29yZXNpZ2h0X2RldmljZSAqY3NkZXYsCj4+PiDC oMKgwqDCoMKgIH0KPj4+IMKgIMKgwqDCoMKgwqAgLyogcmV0dXJuIHN0YWNrIC0gZW5hYmxlIGlm IHNlbGVjdGVkIGFuZCBzdXBwb3J0ZWQgKi8KPj4+IC3CoMKgwqAgaWYgKChhdHRyLT5jb25maWcg JiBCSVQoRVRNX09QVF9SRVRTVEspKSAmJiBkcnZkYXRhLT5yZXRzdGFjaykKPj4+IC3CoMKgwqDC oMKgwqDCoCAvKiBiaXRbMTJdLCBSZXR1cm4gc3RhY2sgZW5hYmxlIGJpdCAqLwo+Pj4gLcKgwqDC oMKgwqDCoMKgIGNvbmZpZy0+Y2ZnIHw9IEJJVCgxMik7Cj4+PiAtCj4+PiArwqDCoMKgIGlmIChh dHRyLT5jb25maWcgJiBCSVQoRVRNX09QVF9SRVRTVEspKSB7Cj4+PiArwqDCoMKgwqDCoMKgwqAg aWYgKCFkcnZkYXRhLT5yZXRzdGFjaykgewo+Pj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqAgcmV0 ID0gLUVJTlZBTDsKPj4+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIGdvdG8gb3V0Owo+Pj4gK8Kg wqDCoMKgwqDCoMKgIH0gZWxzZSB7Cj4+PiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCAvKiBiaXRb MTJdLCBSZXR1cm4gc3RhY2sgZW5hYmxlIGJpdCAqLwo+Pj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKg wqAgY29uZmlnLT5jZmcgfD0gQklUKDEyKTsKPj4+ICvCoMKgwqDCoMKgwqDCoCB9Cj4+Cj4+IG5p dDogV2hpbGUgYXQgdGhpcywgcGxlYXNlIGNvdWxkIHlvdSBjaGFuZ2UgdGhlIGhhcmQgY29kZWQg dmFsdWUKPj4gdG8gRVRNNF9DRkdfQklUX1JFVFNUSyA/Cj4+Cj4gSSBzdGFydGVkIGNoYW5naW5n IHRoZW0gYWxsIGJlY2F1c2UgSSBoYWQgdHJvdWJsZSBzZWFyY2hpbmcgZm9yIGJpdHMgYnkgbmFt ZSBidXQgdGhlbgo+IEkgdGhvdWdodCBpdCB3b3VsZCBzbm93YmFsbCBpbnRvIGEgYmlnZ2VyIGNo YW5nZSBzbyBJIHVuZGlkIGl0Lgo+IAo+IEkgdGhpbmsgSSdsbCBqdXN0IGdvIGFuZCBkbyBpdCBu b3cgaWYgaXQncyBhbiBpc3N1ZSBoZXJlLgoKSGkgU3V6dWtpLAoKSSBzdGFydGVkIG9uIHRoaXMg YW5kIEkgdGhpbmsgdGhlIG9ubHkgd29ydGh3aGlsZSBjaGFuZ2UgaXMgdG8gbWFrZSB0aGVtIGFs bCBjb25zaXN0ZW50CndpdGggc3lzcmVnLmguIEFzIGluIGhhdmUgeHh4X1NISUZUIGFuZCB4eHhf TUFTSyBzdHlsZSBkZWZpbml0aW9ucyBsaWtlOgoKICAjZGVmaW5lIFRSQ0NPTkZJR1JfSU5TVFAw X1NISUZUCQkxCiAgI2RlZmluZSBUUkNDT05GSUdSX0lOU1RQT19NQVNLCQlHRU5NQVNLKDEsMCkK ClRoaXMgaGFzIGJlZW4gZG9uZSBmb3IgU1BFIGFuZCBzb21lIG9mIHRoZSBuZXcgRVRNIHN0dWZm LiBJZiB0aGF0IHNvdW5kcyByaWdodCB0byB5b3UKSSB3aWxsIGdvIGFuZCBkbyBpdCBhcyBhIGZv bGxvd3VwIHBhdGNoIHRvIHRoaXMgb25lLiBJdCBpcyBxdWl0ZSBhIGJpdCBjaGFuZ2Ugc28gSSBj YW4Kc2VlIG1heWJlIHdlIGRvbid0IHdhbnQgdG8gZG8gaXQ/IChQZXJzb25hbGx5IEkgd291bGQg dm90ZSB0byBkbyBpdCkKCkphbWVzCgo+IAo+PiBPdGhlcndpc2UsIGxvb2tzIGdvb2QgdG8gbWUK Pj4KPj4gU3V6dWtpCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3Rz LmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5m by9saW51eC1hcm0ta2VybmVsCg==