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Mon, 13 Jan 2020 07:52:28 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1578898348; bh=BEG+waaqceEGqvmTkmRPJ8Qzyso8PEjwXnIakVOqtZc=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=NVd27d+gFiIyUuKl/HLoK+La1AiiYRZnEQtAMYVLE60YGvnlTuLzA+Zj2M0GA+Ket FpVfMNKOrYwhgR+zTPLHtu0BWa6zZ6Ph7297vQIxUho+xhYLUTI/NMu1Gj3zsDCx0k Uvvo9nAJ3jOmw8RlqvoHHkfMpgYirFnUFWki46WU= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 30D588B79C; Mon, 13 Jan 2020 07:52:33 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id gGYtxlUDGq_J; Mon, 13 Jan 2020 07:52:33 +0100 (CET) Received: from [172.25.230.100] (po15451.idsi0.si.c-s.fr [172.25.230.100]) by messagerie.si.c-s.fr (Postfix) with ESMTP id AD2CA8B752; Mon, 13 Jan 2020 07:52:32 +0100 (CET) Subject: Re: [RFC PATCH v2 07/10] lib: vdso: don't use READ_ONCE() in __c_kernel_time() To: Thomas Gleixner , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , arnd@arndb.de, vincenzo.frascino@arm.com, luto@kernel.org References: <87lfqfrp7d.fsf@nanos.tec.linutronix.de> <878smes13d.fsf@nanos.tec.linutronix.de> From: Christophe Leroy Message-ID: Date: Mon, 13 Jan 2020 07:52:31 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <878smes13d.fsf@nanos.tec.linutronix.de> Content-Language: fr X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200112_225256_146177_C50ED985 X-CRM114-Status: GOOD ( 16.51 ) 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: x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpMZSAxMS8wMS8yMDIwIMOgIDEyOjA3LCBUaG9tYXMgR2xlaXhuZXIgYSDDqWNyaXTCoDoKPiBD aHJpc3RvcGhlIExlcm95IDxjaHJpc3RvcGhlLmxlcm95QGMtcy5mcj4gd3JpdGVzOgo+Pgo+PiBX aXRoIFJFQURfT05DRSgpIHRoZSA2NCBiaXRzIGFyZSBiZWluZyByZWFkOgo+Pgo+PiBXaXRob3V0 IHRoZSBSRUFEX09OQ0UoKSBvbmx5IDMyIGJpdHMgYXJlIHJlYWQuIFRoYXQncyB0aGUgbW9zdCBv cHRpbWFsLgo+Pgo+PiBXaXRob3V0IFJFQURfT05DRSgpIGJ1dCB3aXRoIGEgYmFycmllcigpIGFm dGVyIHRoZSByZWFkLCB3ZSBzaG91bGQgZ2V0Cj4+IHRoZSBzYW1lIHJlc3VsdCBidXQgR0NDIChH Q0MgOC4xKSBkb2VzIGxlc3MgZ29vZDoKPj4KPj4gQXNzdW1pbmcgYm90aCBwYXJ0IG9mIHRoZSA2 NCBiaXRzIGRhdGEgd2lsbCBmYWxsIGludG8gYSBzaW5nbGUKPj4gY2FjaGVsaW5lLCB0aGUgc2Vj b25kIHJlYWQgaXMgaW4gdGhlIG5vaXNlLgo+IAo+IFRoZXkgZGVmaW5pdGVseSBhcmUgaW4gdGhl IHNhbWUgY2FjaGVsaW5lLgo+IAo+PiBTbyBhZ3JlZWQgdG8gZHJvcCB0aGlzIGNoYW5nZS4KPiAK PiBXZSBjb3VsZCBiZSBzbWFydCBhYm91dCB0aGlzIGFuZCBmb3JjZSB0aGUgY29tcGlsZXIgdG8g aXNzdWUgYSAzMmJpdAo+IHJlYWQgZm9yIDMyYml0IGJ1aWxkcy4gU2VlIGJlbG93LiBOb3Qgc3Vy ZSB3aGV0aGVyIGl0J3Mgd29ydGggaXQsIGJ1dAo+IE9UT0ggaXQgd2lsbCB0YWtlIHF1aXRlIGEg d2hpbGUgdW50aWwgdGhlIDMyYml0IHRpbWUgaW50ZXJmYWNlcyBkaWUKPiBjb21wbGV0ZWx5LgoK SSBkb24ndCB0aGluayBpdCBpcyB3b3J0aCBzb21ldGhpbmcgc28gYmlnIHRvIGp1c3Qgc2F2ZSAx IG9yIDIgY3ljbGVzIGluIAp0aW1lKCkgZnVuY3Rpb24uIExldHMga2VlcCBpdCBhcyBpdCBpcy4K ClRoYW5rcywKQ2hyaXN0b3BoZQoKPiAKPiBUaGFua3MsCj4gCj4gICAgICAgICAgdGdseAo+IAo+ IDg8LS0tLS0tLS0tLS0tCj4gLS0tIGEvaW5jbHVkZS92ZHNvL2RhdGFwYWdlLmgKPiArKysgYi9p bmNsdWRlL3Zkc28vZGF0YXBhZ2UuaAo+IEBAIC0yMSw2ICsyMSwxOCBAQAo+ICAgI2RlZmluZSBD U19SQVcJCTEKPiAgICNkZWZpbmUgQ1NfQkFTRVMJKENTX1JBVyArIDEpCj4gICAKPiArI2lmZGVm IF9fTElUVExFX0VORElBTgo+ICtzdHJ1Y3Qgc2VjX2hsIHsKPiArCXUzMglzZWNfbDsKPiArCXUz MglzZWNfaDsKPiArfTsKPiArI2Vsc2UKPiArc3RydWN0IHNlY19obCB7Cj4gKwl1MzIJc2VjX2g7 Cj4gKwl1MzIJc2VjX2w7Cj4gK307Cj4gKyNlbmRpZgo+ICsKPiAgIC8qKgo+ICAgICogc3RydWN0 IHZkc29fdGltZXN0YW1wIC0gYmFzZXRpbWUgcGVyIGNsb2NrX2lkCj4gICAgKiBAc2VjOglzZWNv bmRzCj4gQEAgLTM1LDcgKzQ3LDEwIEBACj4gICAgKiB2ZHNvX2RhdGEuY3NbeF0uc2hpZnQuCj4g ICAgKi8KPiAgIHN0cnVjdCB2ZHNvX3RpbWVzdGFtcCB7Cj4gLQl1NjQJc2VjOwo+ICsJdW5pb24g ewo+ICsJCXU2NAkJc2VjOwo+ICsJCXN0cnVjdCBzZWNfaGwJc2VjX2hsOwo+ICsJfTsKPiAgIAl1 NjQJbnNlYzsKPiAgIH07Cj4gICAKPiAtLS0gYS9saWIvdmRzby9nZXR0aW1lb2ZkYXkuYwo+ICsr KyBiL2xpYi92ZHNvL2dldHRpbWVvZmRheS5jCj4gQEAgLTE2NSw4ICsxNjUsMTMgQEAgc3RhdGlj IF9fbWF5YmVfdW51c2VkIGludAo+ICAgc3RhdGljIF9fbWF5YmVfdW51c2VkIF9fa2VybmVsX29s ZF90aW1lX3QgX19jdmRzb190aW1lKF9fa2VybmVsX29sZF90aW1lX3QgKnRpbWUpCj4gICB7Cj4g ICAJY29uc3Qgc3RydWN0IHZkc29fZGF0YSAqdmQgPSBfX2FyY2hfZ2V0X3Zkc29fZGF0YSgpOwo+ IC0JX19rZXJuZWxfb2xkX3RpbWVfdCB0ID0gUkVBRF9PTkNFKHZkW0NTX0hSRVNfQ09BUlNFXS5i YXNldGltZVtDTE9DS19SRUFMVElNRV0uc2VjKTsKPiArCV9fa2VybmVsX29sZF90aW1lX3QgdDsK PiAgIAo+ICsjaWYgQklUU19QRVJfTE9ORyA9PSAzMgo+ICsJdCA9IFJFQURfT05DRSh2ZFtDU19I UkVTX0NPQVJTRV0uYmFzZXRpbWVbQ0xPQ0tfUkVBTFRJTUVdLnNlY19obC5zZWNfbCk7Cj4gKyNl bHNlCj4gKwl0ID0gUkVBRF9PTkNFKHZkW0NTX0hSRVNfQ09BUlNFXS5iYXNldGltZVtDTE9DS19S RUFMVElNRV0uc2VjKTsKPiArI2VuZGlmCj4gICAJaWYgKHRpbWUpCj4gICAJCSp0aW1lID0gdDsK PiAgIAo+IAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K bGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZy YWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGlu dXgtYXJtLWtlcm5lbAo=