From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) (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 C50823D9028; Wed, 3 Jun 2026 16:17:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780503439; cv=none; b=IFhlPEnMgka89cpGuJWy03TA3DEgKogm7EP/gqtG7Vek42rtvzfdLCu6HeQVu2vMGkW58cEw8N1n2YgaOH4WGwwpDRsD3EerF7MzBWDp2k1VWDRNZoiijiGdrLQ5s73Ny10vvdiqQlEz4yUOxjttqQilU6xtHNlYrBQ88B4fPK4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780503439; c=relaxed/simple; bh=oFJ0I7c8IRKtvheN2lLRAc9vrx9iFyNX05vWU1a35jE=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pUk1Jrl9J3B7b4DWvM5F6B8pVmQGW/S578iXuwJGY213Tdfdu0ofKIA02ocMlYgzsHcMgzpxY3Ji2ivBAcc05QE5EGTOBs7Gd4xaEVFMoiv/gEGCBWeHpv4A3K7f+0RbTWesW8MK1SljQXAA1VLghpll0HWE9zeW8Lf2UVO82S4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf15.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id EE67D4046F; Wed, 3 Jun 2026 16:17:09 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf15.hostedemail.com (Postfix) with ESMTPA id 1CB8C17; Wed, 3 Jun 2026 16:17:07 +0000 (UTC) Date: Wed, 3 Jun 2026 12:17:07 -0400 From: Steven Rostedt To: "David Hildenbrand (Arm)" Cc: "Zhuo, Qiuxu" , "mchehab+huawei@kernel.org" , "Luck, Tony" , "bp@alien8.de" , "akpm@linux-foundation.org" , "linmiaohe@huawei.com" , "xieyuanbin1@huawei.com" , "Lai, Yi1" , "linux-kernel@vger.kernel.org" , "linux-edac@vger.kernel.org" , "linux-mm@kvack.org" , "linux-trace-kernel@vger.kernel.org" , Linus Torvalds Subject: Re: mm/memory-failure tracepoint change breaks userspace rasdaemon Message-ID: <20260603121707.7eccb9fb@gandalf.local.home> In-Reply-To: References: X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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-Transfer-Encoding: 7bit X-Stat-Signature: pa3ma5qhsjqu49awbk79oorp7gqmdrcw X-Rspamd-Server: rspamout06 X-Rspamd-Queue-Id: 1CB8C17 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX18Y0GCOrJZJoVDEDn/Ri6LOhG4txmh7D10= X-HE-Tag: 1780503427-767641 X-HE-Meta: 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 On Wed, 3 Jun 2026 15:44:54 +0200 "David Hildenbrand (Arm)" wrote: > Likely the latter. BPF [1] documents: > > Q: Are tracepoints part of the stable ABI? > A: NO. Tracepoints are tied to internal implementation details hence they are > subject to change and can break with newer kernels. BPF programs need to change > accordingly when this happens. > > The Kernel ABI document explicitly doesn't list them AFAIKS. > > There were previous discussions on the stability of tracepints [2], I don't know > what changed in the meantime. CCing Steve > > [1] https://www.kernel.org/doc/html/latest/bpf/bpf_design_QA.html > [2] https://lwn.net/Articles/747256/ > [3] https://www.kernel.org/doc/html/latest/admin-guide/abi.html Tracepoints are not stable or BPF programs only. But other applications they are[1]. Adding Linus as he's the Supreme Judge on the matter. -- Steve [1] https://lwn.net/Articles/442113/