From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.137.202.136 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794622934; b=NeY62Wdvz/Y9VKOepLuNNgxee6XxmdItJk+aLSEj99gxHbbMHWc073FsWlFNV7YIjpRv 3erxq+HK3lf5+yJNYefy2POtIGyh3vBB0cPrQYbdzjLCoa02UGlHSm5N4sfSrajRSExyc vuHHuxWO9BAqHbKayNOn6MVO74PL4gCxTrOz8xL2W0zI1U27irB4ie8AdwQeCr52SX4oa aTl9r3U4DSMuhQCE9Y+CvqnQBUTgfb7Qp3F401SWBwlm6l43Gz3dJ+oIyQx0AbawsKGpH RnITPYyHscHSjUOF/q35AFsseQnBQt7VhT1Wbfpjn4q0fEiHv+FVLDwOXBxiLJ3uxyg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794622934; h=DMARC-Filter:Received:DKIM-Filter:DKIM-Signature:Date:From:To:CC: Subject:User-Agent:In-Reply-To:References:Message-ID:MIME-Version: Content-Type:Content-Transfer-Encoding; bh=AIQbKLU43LccGRdCT2aBSjvUNYwADfWwVpipaPEX5yE=; b=LTIVFBOzvRxfKUlC+NhQRTSF7t0xbwV69D0fZ27/vfJHg/jt/u46XO2FnU51y3Ekvo0p 6pKE07XakhFhVT7XyjB9btd3m7OPnrfV1VVjVZoZzTixop/BCokODrPLgV5z73rwH3BQc ilSDjf40QyuFkRBKdVBfwNqj5QRcAPYIWoqMd41Evd1XrwfubHABkuiIuvOKIdFY5SCZ2 Y9FNTrEN20aaeQglsT5auFp8W4BIkHRMlwoOzF/NHQ0EqfNB70vLT7wJLN5JYFQQcBY/j Zd2eJqWHUkOJInpSGPaIg8VkoTeuwb/99m56pbn9cACqzuCFQ+pHfnTJbVILsgEnksw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=zytor.com; spf=pass smtp.mailfrom=zytor.com; dkim=pass header.d=zytor.com header.i=@zytor.com header.a=rsa-sha256 header.s=2026102901 header.b=oipzlGEN; arc=none smtp.remote-ip=198.137.202.136 Received: from mail.zytor.com (terminus.zytor.com [198.137.202.136]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A0D8606A323 for ; Sat, 14 Nov 2026 02:22:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 0A0D8606A323 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zytor.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zytor.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=zytor.com header.i=@zytor.com header.a=rsa-sha256 header.s=2026102901 header.b=oipzlGEN Received: from ehlo.thunderbird.net (c-76-133-66-138.hsd1.ca.comcast.net [76.133.66.138]) (authenticated bits=0) by mail.zytor.com (8.18.1/8.17.1) with ESMTPSA id 6AE2LSUm3991062 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Fri, 13 Nov 2026 18:21:29 -0800 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 6AE2LSUm3991062 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2026102901; t=1794622890; bh=AIQbKLU43LccGRdCT2aBSjvUNYwADfWwVpipaPEX5yE=; h=Date:From:To:CC:Subject:In-Reply-To:References:From; b=oipzlGENzY2Kcmv+sjX1xsxIs/F5idBbiPree/Qcj2b9RS1k6efUAF0NB2z4OoKi+ K1dDKTVS7A8HCxQbwG2R3Kiy9qNFJPTGRoXV/DujZHTz/kZyG0xLCB8fJECLhc1pT9 +IhFviNfMbqzjXmFJy+4rAgXRRkGqZQjNSNOTTVL9AqAYMIkkWcQSezdLGWB/XLTgI iGu3mH8V50gCfi6KPe6p3BuZ2Hc0DdixOJdwStco2ei0UyBwdSHlXS4PhnUJuMNqBl qIVunAND1T84Nu4CknXpKjWPpShr5WfMu5SFO4OYOmpLtY16cWzIjuC+rL1Zh9fe5s HOp4Bjn27lwiw== Date: Fri, 13 Nov 2026 18:21:23 -0800 From: "H. Peter Anvin" To: Borislav Petkov CC: Linus Torvalds , David Laight , Usama Arif , dave.hansen@linux.intel.com, dsterba@suse.com, linux-kernel@vger.kernel.org, mingo@redhat.com, terrelln@fb.com, tglx@kernel.org, x86@kernel.org, kas@kernel.org, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, kernel-team@meta.com Subject: =?US-ASCII?Q?Re=3A_=5BPATCH_v3_2/2=5D_x86/lib=3A_Use_REP_MOVSB_f?= =?US-ASCII?Q?or_large_memcpy=28=29_on_ERMS_CPUs_without_FSRM?= User-Agent: K-9 Mail for Android In-Reply-To: <20261113233703.GCavefHwxVZX8mGFCm@fat_crate.local> References: <20261111234608.GAavT-QFRo6EtvoL0y@fat_crate.local> <20261113141137.1113517-1-usama.arif@linux.dev> <20261113160300.3f0d0a37@pumpkin> <20261113233703.GCavefHwxVZX8mGFCm@fat_crate.local> Message-ID: <628BDCC5-B599-4B70-B512-E13DEE926DFA@zytor.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On November 13, 2026 3:37:03 PM PST, Borislav Petkov wrote= : >On Fri, Nov 13, 2026 at 10:36:30AM -0800, H=2E Peter Anvin wrote: >> Well, we can put a request in for compiler support=2E This equally appl= ies to >> other compiler runtime functions, for that matter=2E=2E=2E > >I was going to suggest that too=2E Lemme know if I should ping my gcc fol= ks=2E=2E=2E > Seems like a good idea to me=2E Presumably it would be using the rep movsb= convention=2E