From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 886FD4921BD for ; Thu, 3 Sep 2026 10:55:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788432921; cv=none; b=msEhrqla7q78wNxhMtW/pgbB/tv0o0BcGELRKDDNwqriTqVl2ZaHTpaS7KC2MxZquRlkeQPgOFeOKA5sWbQ6N3j4XSJqGOYwjLyZhPdbqw36CzwmzWsI9RrwDJK8Yi88Q0mOtiSw+mzulDQiDskkR9LktygpjcrudhHvUAHbcFI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788432921; c=relaxed/simple; bh=0ZNppeh0ZlYWtizsvSK/rGmy7+pcL/M5jSpzzhNgk3k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dEnCKUTVpKhKy5YvyrXJUqSFYwRiE/fppibsTfbyV+XUy+UKesSEdJ552kIUc3zG98FDa0suTFWEEKpA32pfl045+AgaxYPikALuII9FvZHekClM5m7FGp5PCdb5gJwSadZZEf34AFLFTuxk7daSvOSYwDxmHSBVivY2dYEseHo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ShAwQheQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ShAwQheQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B77E91F000E9; Thu, 3 Sep 2026 10:55:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788432920; bh=MS+xJQNxLdGqKYm3UoolvVPTT5UdPibXHtDgluZIrTk=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=ShAwQheQuHIXroeVMwUOAKxfDDGxf+Kjf5b1+cIW4NasQjSoB48stQnAGHdwlbZ2p 3EgtO9d+OmzXlpqUsK+0ygDClfybT0H/l/Oo2ay0Pq8mDQ3B1+9Ohj/AUcpmcSxkxE 9/o+60V7uhkZ9EKw0+44aMCQNNlEpKURjScsxmvr75acJU8lwEw6aDxYhSInQJrQnS auzyA+A5V125G5Oc4U+63Op5miLvv73nr0NEcwRwOwE3OxpZ7tJKQ2s1wmsy0ELjTu /z9O3hGFSAO9nem0mk/7cDagknWz3Y2a9XryXEe380ehCsIWI3iT4/AmMaxZN0hC1m vSsuzEGHIE9zQ== Date: Thu, 3 Sep 2026 11:55:14 +0100 From: Will Deacon To: Jeremy Linton Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Arnaldo Carvalho de Melo , Nick Desaulniers , David Matlack , Steffen Eiden , Andreas Grapentin , Catalin Marinas , Dave Martin , Mark Rutland , Marc Zyngier Subject: Re: [PATCH v2 0/2] Use __u128 in arm64 UAPI headers Message-ID: References: <20260626141730.5976-1-will@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Sep 02, 2026 at 09:21:32PM -0500, Jeremy Linton wrote: > On 6/26/26 9:17 AM, Will Deacon wrote: > > This is version two of the patch I previously sent here: > > > > https://lore.kernel.org/r/20260619130835.5678-1-will@kernel.org > > > > I even briefly queued that version up, but it exploded spectacularly > > when building the kselftests for arm64 [1] [2]. So the only change since > > v1 is the addition of a preliminary patch that adds the '__u128' typedef > > to the private copy of linux/types.h used by the tools/ directory. > > > > I plan to take this all via the arm64 tree unless anybody objects. > > This seems to be creating a interesting situation that the follow-on commit: > 10a47fb67340 tools: linux/types.h: Add 128-bit integer types for arm64 UAPI > structures > > Is missing from older kernel tooling/etc, which means the tools that end up > pulling this header in won't build on machines running 7.3 kernel headers. > > AKA, build/install master, switch back to an older branch and discover say > bpftool won't build anymore. Ah, I guess we need to backport 10a47fb67340 to stable, then? Will