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[85.228.174.190]) by smtp.gmail.com with ESMTPSA id e14sm733549lfd.145.2020.11.21.07.17.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Nov 2020 07:17:23 -0800 (PST) Received: from johan by xi.terra with local (Exim 4.93.0.4) (envelope-from ) id 1kgUdm-0007CG-Q7; Sat, 21 Nov 2020 16:17:31 +0100 Date: Sat, 21 Nov 2020 16:17:30 +0100 From: Johan Hovold To: David Laight Subject: Re: [PATCH] tty: serial: replace spin_lock_irqsave by spin_lock in hard IRQ Message-ID: References: <1605776489-16283-1-git-send-email-tiantao6@hisilicon.com> <9ce93d7b-f769-58ed-e6bf-95c34bd0123e@huawei.com> <40a52ea2273146b98b3ae3439a22d1eb@AcuMS.aculab.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <40a52ea2273146b98b3ae3439a22d1eb@AcuMS.aculab.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201121_194320_086609_D799680B X-CRM114-Status: GOOD ( 33.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "gregkh@linuxfoundation.org" , "manivannan.sadhasivam@linaro.org" , 'Johan Hovold' , "linux-kernel@vger.kernel.org" , "linux-serial@vger.kernel.org" , "tiantao \(H\)" , Tian Tao , Thomas Gleixner , "jirislaby@kernel.org" , "afaerber@suse.de" , "linux-arm-kernel@lists.infradead.org" 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 T24gRnJpLCBOb3YgMjAsIDIwMjAgYXQgMDg6MDA6MDVQTSArMDAwMCwgRGF2aWQgTGFpZ2h0IHdy b3RlOgo+IEZyb206IEpvaGFuIEhvdm9sZAo+ID4gU2VudDogMjAgTm92ZW1iZXIgMjAyMCAxMjo1 MAo+ID4gCj4gPiBPbiBGcmksIE5vdiAyMCwgMjAyMCBhdCAwNzoyNTowM1BNICswODAwLCB0aWFu dGFvIChIKSB3cm90ZToKPiA+ID4g5ZyoIDIwMjAvMTEvMjAgMTY6MjMsIEpvaGFuIEhvdm9sZCDl hpnpgZM6Cj4gPiA+ID4gT24gVGh1LCBOb3YgMTksIDIwMjAgYXQgMDU6MDE6MjlQTSArMDgwMCwg VGlhbiBUYW8gd3JvdGU6Cj4gPiA+ID4+IFRoZSBjb2RlIGhhcyBiZWVuIGluIGEgaXJxLWRpc2Fi bGVkIGNvbnRleHQgc2luY2UgaXQgaXMgaGFyZCBJUlEuIFRoZXJlCj4gPiA+ID4+IGlzIG5vIG5l Y2Vzc2l0eSB0byBkbyBpdCBhZ2Fpbi4KPiA+ID4gPj4KPiA+ID4gPj4gU2lnbmVkLW9mZi1ieTog VGlhbiBUYW8gPHRpYW50YW82QGhpc2lsaWNvbi5jb20+Cj4gPiA+ID4+IC0tLQo+ID4gPiA+PiAg IGRyaXZlcnMvdHR5L3NlcmlhbC9vd2wtdWFydC5jIHwgNSArKy0tLQo+ID4gPiA+PiAgIDEgZmls ZSBjaGFuZ2VkLCAyIGluc2VydGlvbnMoKyksIDMgZGVsZXRpb25zKC0pCj4gPiA+ID4+Cj4gPiA+ ID4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3R0eS9zZXJpYWwvb3dsLXVhcnQuYyBiL2RyaXZlcnMv dHR5L3NlcmlhbC9vd2wtdWFydC5jCj4gPiA+ID4+IGluZGV4IGMxNDlmOGMzLi40NzJmZGFmIDEw MDY0NAo+ID4gPiA+PiAtLS0gYS9kcml2ZXJzL3R0eS9zZXJpYWwvb3dsLXVhcnQuYwo+ID4gPiA+ PiArKysgYi9kcml2ZXJzL3R0eS9zZXJpYWwvb3dsLXVhcnQuYwo+ID4gPiA+PiBAQCAtMjUxLDEw ICsyNTEsOSBAQCBzdGF0aWMgdm9pZCBvd2xfdWFydF9yZWNlaXZlX2NoYXJzKHN0cnVjdCB1YXJ0 X3BvcnQgKnBvcnQpCj4gPiA+ID4+ICAgc3RhdGljIGlycXJldHVybl90IG93bF91YXJ0X2lycShp bnQgaXJxLCB2b2lkICpkZXZfaWQpCj4gPiA+ID4+ICAgewo+ID4gPiA+PiAgIAlzdHJ1Y3QgdWFy dF9wb3J0ICpwb3J0ID0gZGV2X2lkOwo+ID4gPiA+PiAtCXVuc2lnbmVkIGxvbmcgZmxhZ3M7Cj4g PiA+ID4+ICAgCXUzMiBzdGF0Owo+ID4gPiA+Pgo+ID4gPiA+PiAtCXNwaW5fbG9ja19pcnFzYXZl KCZwb3J0LT5sb2NrLCBmbGFncyk7Cj4gPiA+ID4+ICsJc3Bpbl9sb2NrKCZwb3J0LT5sb2NrKTsK PiA+ID4gPgo+ID4gPiA+IFNhbWUgdGhpbmcgaGVyZTsgdGhpcyB3aWxsIGJyZWFrIHdpdGggZm9y Y2VkIGlycSB0aHJlYWRpbmcgKGkuZS4KPiA+ID4gPiAidGhyZWFkaXJxcyIpIHNpbmNlIHRoZSBj b25zb2xlIGNvZGUgY2FuIHN0aWxsIGVuZCB1cCBiZWluZyBjYWxsZWQgZnJvbQo+ID4gPiA+IGlu dGVycnVwdCBjb250ZXh0Lgo+ID4gCj4gPiA+IEFzIHRoZSBmb2xsb3dpbmcgY29kZSBzaG93cywg b3dsX3VhcnRfaXJxIGRvZXMgbm90IHJ1biBpbiB0aGUgaXJxCj4gPiA+IHRocmVhZGluZyBjb250 ZXh0Lgo+ID4gPiAgIHJldCA9IHJlcXVlc3RfaXJxKHBvcnQtPmlycSwgb3dsX3VhcnRfaXJxLCBJ UlFGX1RSSUdHRVJfSElHSCwKPiA+ID4gICAgICAgICAgICAgICAgICAgICAgICAgICJvd2wtdWFy dCIsIHBvcnQpOwo+ID4gPiAgICAgICAgICBpZiAocmV0KQo+ID4gPiAgICAgICAgICAgICAgICAg IHJldHVybiByZXQ7Cj4gPiAKPiA+IEl0IHN0aWxsIHJ1bnMgaW4gYSB0aHJlYWQgd2hlbiBpbnRl cnJ1cHRzIGFyZSBmb3JjZWQgdG8gYmUgdGhyZWFkZWQKPiA+IHVzaW5nIHRoZSBrZXJuZWwgcGFy YW1ldGVyICJ0aHJlYWRpcnFzIi4KPiA+IAo+ID4gV2UganVzdCBoYWQgYSByZXZlcnQgb2YgYSBj aGFuZ2UgbGlrZSB5b3VycyBhZnRlciBsb2NrZGVwIHJlcG9ydGVkIHRoZQo+ID4gcmVzdWx0aW5n IGxvY2sgaW52ZXJzaW9uIHdpdGggZm9yY2VkIGludGVycnVwdCB0aHJlYWRpbmcuCj4gPiAKPiA+ IFdoZXRoZXIgZHJpdmVycyBzaG91bGQgaGF2ZSB0byBjYXJlIGFib3V0ICJ0aHJlYWRpcnFzIiBp cyBhIHNvbWV3aGF0Cj4gPiBkaWZmZXJlbnQgcXVlc3Rpb24uIE5vdCBzdXJlIGhvdyB0aGF0J3Mg ZXZlbiBzdXBwb3NlZCB0byB3b3JrIGdlbmVyYWxseQo+ID4gdW5sZXNzIHdlIG1hc3MtY29udmVy dCBkcml2ZXJzIHRvIHNwaW5fbG9ja19pcnFzYXZlKCkgKG9yIG1hcmsgdGhlaXIKPiA+IGludGVy cnVwdHMgSVJRRl9OT19USFJFQUQpLgo+IAo+IElzbid0IHRoYXQgYmFja3dhcmRzPwo+IAo+IFlv dSBuZWVkIHRvIHVzZSB0aGUgJ2lycXNhdmUnIHZhcmlhbnQgaW4gY29kZSB0aGF0IG1pZ2h0IHJ1 biB3aXRoCj4gaW50ZXJydXB0cyBlbmFibGVkIGJlY2F1c2UgYW4gaW50ZXJydXB0IG1pZ2h0IHRy eSB0byBhY3F1aXJlIHRoZQo+IHNhbWUgbG9jayBoYXZpbmcgaW50ZXJydXB0ZWQgdGhlIGNvZGUg dGhhdCBhbHJlYWR5IGhvbGRzIHRoZSBsb2NrLgo+IAo+IElmIGludGVycnVwdHMgcnVuIGFzIHNl cGFyYXRlIHRocmVhZHMgdGhhdCBjYW4gbmV2ZXIgaGFwcGVuLgo+IFNvIGluIHRoYXQgY2FzZSBh bGwgY29kZSBjYW4gdXNlIHRoZSBub24taXJxc2F2ZSBjYWxsLgo+IAo+IFNvIGVpdGhlciBsb2Nr ZGVwIGlzIGJyb2tlbiBvciB5b3UgaGF2ZSBhIGRpZmZlcmVudCBidWcuCgpOb3QgYWxsIGludGVy cnVwdHMgcnVuIGFzIHRocmVhZHMgd2l0aCAidGhyZWFkaXJxcyIgc28gdGhlIGxvY2sgY2FuCnBv dGVudGlhbGx5IHN0aWxsIGJlIHRha2VuIGluIGhhcmQgSVJRIGNvbnRleHQgYWxzbyB3aXRoIGZv cmNlZAp0aHJlYWRpbmcuCgpGb3IgY29uc29sZSBkcml2ZXJzIHRoaXMgY2FuIGV2ZW4gaGFwcGVu IGZvciB0aGUgc2FtZSBpbnRlcnJ1cHQgYXMgdGhlCmdlbmVyaWMgaW50ZXJydXB0IGNvZGUgY2Fu IGNhbGwgcHJpbnRrKCksIGFuZCBzbyBjYW4gYW55IG90aGVyIGhhbmRsZXIKdGhhdCBpc24ndCB0 aHJlYWRlZCAoZS5nLiBocnRpbWVycyBvciBleHBsaWNpdCBJUlFGX05PX1RIUkVBRCkuCgpJZiBh IGRyaXZlciBleHBvc2VzIGFuIGludGVyZmFjZSB0aGF0IGNhbiBiZSBjYWxsZWQgaW4gaGFyZCBJ UlEgY29udGV4dCwKaXQgbXVzdCB1c2Ugc3Bpbl9sb2NrX2lycXNhdmUoKSBpbiBpdHMgaW50ZXJy dXB0IGhhbmRsZXIgKG9yIHVzZQpJUlFGX05PX1RIUkVBRCkgYmVjYXVzZSBvZiAidGhyZWFkaXJx cyIuCgpKb2hhbgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5p bmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8v bGludXgtYXJtLWtlcm5lbAo=