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 87343CA5FC4 for ; Fri, 2 Oct 2026 09:28:22 +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=npG51dgxNo0askI0cfOacg3oKTQx40N+NisyrnN2lHU=; b=vypAdi2z/LJrI2 S0Uadu7me/l+C/dmmzlPZc1gmSUSAawXL0t9OsMlTbeJ3BOgzO983IEyNtqDGe4K652LKns5kANu2 zr7iyU/hufNRYGx6EWWgAntuOoLllr2ldQ300BcQ3WyeiPBPq5/BltwOnrVp2eLM5+BbcoxxSMezM LcLyj2pO6wNsklvrkMKBierSIZ18lwFxbNLeA5qmUgl1tcmr2qbzjjsR+0aIso9yEjQJBrBxBPB5c Li8Zwm3wE1r6/ORTeRbylaP/yZ9OApqEofYuQbgXMP+G8O5LRj4RsX+cz9zq+KsN8ZDZkZYWa2+nz XckpFXovmMgPmwu8yHSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCZYn-0000000B8wJ-0eAh; Fri, 02 Oct 2026 09:28:09 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCZYl-0000000B8va-2sOT; Fri, 02 Oct 2026 09:28:08 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 0C3DF60A70; Fri, 2 Oct 2026 09:28:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 424F21F000FF; Fri, 2 Oct 2026 09:28:03 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=zx2c4.com header.i=@zx2c4.com header.a=rsa-sha256 header.s=20210105 header.b=JXF9aYC9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1790933279; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dtcin0LGddrGq1z73zXhBfHbevxSulJDQC2ODA9S4LA=; b=JXF9aYC9WwUSK4dqsSbWZahQOF5tPs+qWfT6am7iM2kEiqJtJzCVxFzDeTv/m/a4MQVUpO GLRdB7QsZbpopzZdWvYR/SsEQbyfmCcXe2exUQZ5/eF4uZWlcciUWsy7qUj8Yd99apyea/ uqdi3Lw+wZdB/dnq0RpegAZySOW8XXE= Received: by mail.zx2c4.com (OpenSMTPD) with ESMTPSA id 0f473697 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Fri, 2 Oct 2026 09:27:58 +0000 (UTC) Date: Fri, 2 Oct 2026 11:27:54 +0200 From: "Jason A. Donenfeld" To: "Christophe Leroy (CS GROUP)" Cc: Nathan Chancellor , Nick Desaulniers , Andy Lutomirski , Thomas Gleixner , Theodore Ts'o , Vincenzo Frascino , Bill Wendling , Justin Stitt , Catalin Marinas , Will Deacon , Mark Rutland , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH v2] random: vDSO: Avoid call to memset() when zeroing reserved in __cvdso_getrandom_data() Message-ID: References: <20260930133813.GA3142230@ax162> <20260930151337.GD3142230@ax162> <20261001102059.GA4176271@ax162> <83a874fb-db66-4dc2-8e14-68c7e28ae27c@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <83a874fb-db66-4dc2-8e14-68c7e28ae27c@kernel.org> 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 T24gRnJpLCBPY3QgMDIsIDIwMjYgYXQgMTE6MTg6NTFBTSArMDIwMCwgQ2hyaXN0b3BoZSBMZXJv eSAoQ1MgR1JPVVApIHdyb3RlOgo+IAo+IAo+IExlIDAxLzEwLzIwMjYgw6AgMTI6NDgsIEphc29u IEEuIERvbmVuZmVsZCBhIMOpY3JpdMKgOgo+ID4gT24gVGh1LCBPY3QgMDEsIDIwMjYgYXQgMTI6 MjA6NTlQTSArMDIwMCwgTmF0aGFuIENoYW5jZWxsb3Igd3JvdGU6Cj4gPj4gY29udHJvbC4gVGhl IGNoYW5nZSB0aGF0IGludHJvZHVjZWQgLW1heC1zdG9yZS1tZW1zZXQgb25seSBkaWQgaXQgdG8K PiA+PiAiYWxsb3cgZmluZS10dW5pbmcgb2YgdGhlIGlubGluaW5nIHRocmVzaG9sZCBmb3IgcGVy Zm9ybWFuY2UgYW5hbHlzaXMKPiA+PiBhbmQgb3B0aW1pemF0aW9uIi4gSWYgdGhleSBkZWNpZGUg dG8gcmVtb3ZlIGl0IGZvciB3aGF0ZXZlciByZWFzb24sCj4gPj4gd2UncmUgYmFjayB0byBzcXVh cmUgb25lLgo+ID4gCj4gPiBJIHN1cHBvc2UgYWxsIHRoZSBtb3JlIHJlYXNvbiB0byBnZXQgLWZp bmxpbmUtc3RyaW5nb3BzPW1lbXNldCBhZGRlZCB0bwo+ID4gY2xhbmcuIFRoZW4gdGhlIGR1YWwt ZGVmYXVsdCB0aGluZyB5b3UgY2FtZSB1cCB3aXRoIGJlbG93IHdpbGwgbmF0dXJhbGx5Cj4gPiBz dGFydCBjaG9vc2luZyB0aGUgZmlyc3Qgb3B0aW9uIHdoZW4gaXQgYmVjb21lcyBhdmFpbGFibGUu Cj4gPiAKPiA+PiBJIGtub3cgc29tZXRoaW5nIGxpa2UgYmVsb3cgd291bGQgYmUgdWdsaWVyIGR1 ZSB0byB0aGUgaWZkZWYgYnV0IGl0Cj4gPj4gd291bGQgYXZvaWQgY2hhbmdpbmcgYW55dGhpbmcg Zm9yIEdDQyB3aGlsZSBjbGVhcmluZyB1cCB0aGUgaXNzdWUgYXQKPiA+PiBoYW5kIGZvciBjbGFu ZyBpbiBhIGd1YXJhbnRlZWQgc3RhYmxlIGFuZCBzdWNjaW5jdCBtYW5uZXIuCj4gPiAKPiA+IEJ1 dCB0aGVuIHdlJ3JlIGJhY2sgdG8gdGhlIGJ5dGUtYnktYnl0ZSBjb2RlZ2VuIHRoYXQgQ2hyaXN0 b3BoZSBwb2ludGVkCj4gPiBvdXQuCj4gPiAgIAo+ID4+IElmIHRoYXQgaXMgbm90IGFjY2VwdGFi bGUsIHNvbWV0aGluZyBsaWtlIHRoZSBmb2xsb3dpbmcgZG9lcyBhcHBlYXIgdG8KPiA+PiB3b3Jr IGZvciBtZS4KPiA+IAo+ID4gT2theSwgZ3JlYXQsIGxldCdzIGRvIHRoYXQuCj4gPiAKPiA+IERv ZXMgdGhpcyBjb21taXQgc2VlbSBva2F5IHdpdGggeW91PyBJIHVzZWQgdGhlIGRpZmYgeW91IHNl bnQgYmVsb3cgYW5kCj4gPiBhZGp1c3RlZCB0aGUgY29tbWl0IG1lc3NhZ2U6IGh0dHBzOi8vZXVy MDEuc2FmZWxpbmtzLnByb3RlY3Rpb24ub3V0bG9vay5jb20vP3VybD1odHRwcyUzQSUyRiUyRmdp dC56eDJjNC5jb20lMkZsaW51eC1ybmclMkZjb21taXQlMkYlM0ZpZCUzRDU2ZmY5NWVlODU3MTUw NDdlYjViNTIyMDI0Mzc3OGFmNjU3Nzc4YzgmZGF0YT0wNSU3QzAyJTdDY2hyaXN0b3BoZS5sZXJv eSU0MGNzZ3JvdXAuZXUlN0NkODliNGRlMjJmZjk0YjZiZTcxMjA4ZGYxZmE5ODM5YSU3QzhiODdh ZjdkODY0NzRkYzc4ZGY0NWY2OWEyMDExYmI1JTdDMCU3QzAlN0M2MzkyNjQ0ODUwNTU0OTAwMjkl N0NVbmtub3duJTdDVFdGcGJHWnNiM2Q4ZXlKRmJYQjBlVTFoY0draU9uUnlkV1VzSWxZaU9pSXdM akF1TURBd01DSXNJbEFpT2lKWGFXNHpNaUlzSWtGT0lqb2lUV0ZwYkNJc0lsZFVJam95ZlElM0Ql M0QlN0MwJTdDJTdDJTdDJnNkYXRhPVZ4Zjh4UkNkTGF2dHc0RG1pJTJCNDlGWTFsSkRXdG0lMkJq S3Y3ZjhCeEtUR3E0JTNEJnJlc2VydmVkPTAKPiA+IAo+IAo+IFRoZSBjb21taXQgbWVzc2FnZSBz YXlzOiBTaW1pbGFybHksIEdDQyBoYXMgLWZpbmxpbmUtc3RyaW5nb3BzPW1lbXNldCB0byAKPiBk byB0aGUgc2FtZSBbNF0sIHNob3VsZCB0aGlzIGlzc3VlIGV2ZXIgaGl0IGZ1dHVyZSB2ZXJzaW9u IG9mIEdDQy4KPiAKPiBXaHkgZGVmYXVsdCAiLWZpbmxpbmUtc3RyaW5nb3BzPW1lbXNldCIgaWYg Cj4gJChjYy1vcHRpb24sLWZpbmxpbmUtc3RyaW5nb3BzPW1lbXNldCksIGhhdmUgd2UgaWRlbnRp ZmllZCBjYXNlcyB3aGVyZSAKPiBidWlsZCBmYWlsIHdpdGhvdXQgdGhhdCBvciBpcyBpdCBqdXN0 IGZvciBmdXR1cmUgcHJvdmlzaW9uID8KPiAKPiBBcyBzaG93biBpbiBteSBwcmV2aW91cyBlbWFp bCwgd2l0aCBHQ0MgMTYgb24gcG93ZXJwYzMyIHdlIGdldCBhIAo+IHNsaWdodGx5IGJldHRlciBj b2RlIHdpdGhvdXQgdGhpcyBvcHRpb24uCiAKTm8sIHRoYXQgcGF0Y2ggdGVzdGVkIHRoaXMgb3B0 aW9uICsgYWN0dWFsbHkgY2FsbGluZyBidWlsdGluX21lbXNldC4KVGhpcyBuZXcgcGF0Y2ggaGFz IHRoZSBvcmlnaW5hbCBjb2RlIG9mIHplcm9pbmcgYSBsb25nIGF0IGEgdGltZSwgYnV0CmhhcyB0 aGUgaW5saW5lIG1lbXNldCBvcHRpb24gdG8gcHJldmVudCBmdXR1cmUgR0NDIGZyb20gcmVjb2du aXppbmcgdGhhdApwYXR0ZXJuIGFuZCBtYWtpbmcgaXQgb3V0bGluZS4gQ29kZWdlbiBzaG91bGQg YmUgdGhlIHNhbWUuCgpKYXNvbgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KbGludXgtcmlzY3YgbWFpbGluZyBsaXN0CmxpbnV4LXJpc2N2QGxpc3RzLmlu ZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9s aW51eC1yaXNjdgo=