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[109.252.193.159]) by smtp.googlemail.com with ESMTPSA id e27sm38249lfc.155.2020.11.24.14.59.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Nov 2020 14:59:10 -0800 (PST) Subject: Re: [PATCH v2] ARM: entry: omit FP emulation for UND exceptions taken in kernel mode To: Ard Biesheuvel , linux@armlinux.org.uk References: <20201118130849.7445-1-ardb@kernel.org> From: Dmitry Osipenko Message-ID: <924f5019-d0e9-115a-e563-93994f25b70d@gmail.com> Date: Wed, 25 Nov 2020 01:59:09 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <20201118130849.7445-1-ardb@kernel.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201124_175913_024096_4FA92540 X-CRM114-Status: GOOD ( 16.91 ) 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: Nick Desaulniers , Kees Cook , 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 MTguMTEuMjAyMCAxNjowOCwgQXJkIEJpZXNoZXV2ZWwg0L/QuNGI0LXRgjoKPiBkaWZmIC0tZ2l0 IGEvYXJjaC9hcm0va2VybmVsL2VudHJ5LWFybXYuUyBiL2FyY2gvYXJtL2tlcm5lbC9lbnRyeS1h cm12LlMKPiBpbmRleCBjNDIyMGY1MWZjZjMuLjBlYTg1MjlhNDg3MiAxMDA2NDQKPiAtLS0gYS9h cmNoL2FybS9rZXJuZWwvZW50cnktYXJtdi5TCj4gKysrIGIvYXJjaC9hcm0va2VybmVsL2VudHJ5 LWFybXYuUwo+IEBAIC0yNTIsMzEgKzI1MiwxMCBAQCBfX3VuZF9zdmM6Cj4gICNlbHNlCj4gIAlz dmNfZW50cnkKPiAgI2VuZGlmCj4gLQlACj4gLQlAIGNhbGwgZW11bGF0aW9uIGNvZGUsIHdoaWNo IHJldHVybnMgdXNpbmcgcjkgaWYgaXQgaGFzIGVtdWxhdGVkCj4gLQlAIHRoZSBpbnN0cnVjdGlv biwgb3IgdGhlIG1vcmUgY29udmVudGlvbmFsIGxyIGlmIHdlIGFyZSB0byB0cmVhdAo+IC0JQCB0 aGlzIGFzIGEgcmVhbCB1bmRlZmluZWQgaW5zdHJ1Y3Rpb24KPiAtCUAKPiAtCUAgIHIwIC0gaW5z dHJ1Y3Rpb24KPiAtCUAKPiAtI2lmbmRlZiBDT05GSUdfVEhVTUIyX0tFUk5FTAo+IC0JbGRyCXIw LCBbcjQsICMtNF0KPiAtI2Vsc2UKPiAtCW1vdglyMSwgIzIKPiAtCWxkcmgJcjAsIFtyNCwgIy0y XQkJCUAgVGh1bWIgaW5zdHJ1Y3Rpb24gYXQgTFIgLSAyCj4gLQljbXAJcjAsICMweGU4MDAJCQlA IDMyLWJpdCBpbnN0cnVjdGlvbiBpZiB4eCA+PSAwCj4gLQlibG8JX191bmRfc3ZjX2ZhdWx0Cj4g LQlsZHJoCXI5LCBbcjRdCQkJQCBib3R0b20gMTYgYml0cwo+IC0JYWRkCXI0LCByNCwgIzIKPiAt CXN0cglyNCwgW3NwLCAjU19QQ10KPiAtCW9ycglyMCwgcjksIHIwLCBsc2wgIzE2Cj4gLSNlbmRp Zgo+IC0JYmFkcglyOSwgX191bmRfc3ZjX2ZpbmlzaAo+IC0JbW92CXIyLCByNAo+IC0JYmwJY2Fs bF9mcGUKPiAgCj4gIAltb3YJcjEsICM0CQkJCUAgUEMgY29ycmVjdGlvbiB0byBhcHBseQo+IC1f X3VuZF9zdmNfZmF1bHQ6Cj4gKyBUSFVNQigJdHN0CXI1LCAjUFNSX1RfQklUCQkpCUAgZXhjZXB0 aW9uIHRha2VuIGluIFRodW1iIG1vZGU/Cj4gKyBUSFVNQigJbW92bmUJcjEsICMyCQkJKQlAIGlm IHNvLCBmaXggdXAgUEMgY29ycmVjdGlvbgo+ICAJbW92CXIwLCBzcAkJCQlAIHN0cnVjdCBwdF9y ZWdzICpyZWdzCj4gIAlibAlfX3VuZF9mYXVsdAoKQW0gSSB1bmRlcnN0YW5kaW5nIGNvcnJlY3Rs eSB0aGF0IHdoZW4gY2FsbF9mcGUgd2FzIGludm9rZWQgcHJldmlvdXNseSwKaXQgd2FzIHN1cHBv c2VkIHRvIHByaW50IGV4dHJhIGRlYnVnIGluZm8gYWJvdXQgdGhlIFZGUCBzdGF0ZT8gQnV0IGl0 CmRpZG4ndCB3b3JrIHByb3Blcmx5IGZvciB0aHVtYiBtb2RlLCBjb3JyZWN0PwoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBt YWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=