From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 86D8C20E326 for ; Thu, 27 Mar 2025 10:41:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743072063; cv=none; b=LAlQBPqfBgRsAlFx6Jmjr/ru+S0TADcXZ+3lDReKCBnpd/J1kREwAS5rtMXooqmXrv1OroKiSFmB/pbHb9PJX+NUnjzehFdIx1iMAU4tL0iYxvpuhxC3RiMqjIMhgaVO6vdNirTZwArughT/UjyYOBU+nGHVsVBju7/vW7wzJOE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743072063; c=relaxed/simple; bh=Ezoe49kR7+OTzs5Hu3HjQWUKC5r7LalD1FQSkG40hI0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Z7OwqRXJWADz4g/Ns7StuyOp2+uCjZuFzbnFsWjQ/Mjrn3xROccx5+QL1ipKTsPngle5QDnXLsf2cHrca82jkM38fFRPjcVyy4XMnU2UTEZDW9a070ASYFCAaHY0P5660XlkBFQzybFqk4bOboEdoJiJOzCLLNujjbF5YeAZ6So= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gXJ0SesR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gXJ0SesR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E7FFC4CEDD; Thu, 27 Mar 2025 10:41:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743072063; bh=Ezoe49kR7+OTzs5Hu3HjQWUKC5r7LalD1FQSkG40hI0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=gXJ0SesR6wUH4598bnHQ4Ur78SiVbJfRciil3jI953+nAb4Wnh3eJLJy4F/P2Hync 5K0d05eliuk9rIvVoojlzmTCF9zhNTTxnnhJ7dRX/F2na+imaA4BGiPKPObQFgs5+u GkcM3nlweZsZabZ5DWHnqht7mEMuz8ri5mg40+GMRgDfxmE5zCvsPteFnMtTUy85DE cREaUCUdPx7LrM+3SDxnRy97zQBESYIIq4qAI6cC1ZGErpki/l4m5mohbUOFpmNcHN Bs9I6pJ7quPYXjYXjp+Swh4ES6mDY/niq1vojGp7rFrYrn6Hh4e3ASkD5MZ0ppfZFP c4FiAdHIjjikw== Date: Thu, 27 Mar 2025 11:40:58 +0100 From: Ingo Molnar To: Linus Torvalds Cc: Bert Karwatzki , Christian =?iso-8859-1?Q?K=F6nig?= , Balbir Singh , Kees Cook , Bjorn Helgaas , Peter Zijlstra , Andy Lutomirski , Alex Deucher , linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org Subject: Re: commit 7ffb791423c7 breaks steam game Message-ID: References: <20250325101424.4478-1-spasswolf@web.de> <64945196-f05f-478e-a2b5-f0bd58345136@amd.com> 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: * Linus Torvalds wrote: > On Wed, 26 Mar 2025 at 15:00, Bert Karwatzki wrote: > > > > As Balbir Singh found out this memory comes from amdkfd > > (kgd2kfd_init_zone_device()) with CONFIG_HSA_AMD_SVM=y. The memory gets placed > > by devm_request_free_mem_region() which places the memory at the end of the > > physical address space (DIRECT_MAP_PHYSMEM_END). DIRECT_MAP_PHYSMEM_END changes > > when using nokaslr and so the memory shifts. > > So I just want to say that having followed the thread as a spectator, > big kudos to everybody involved in this thing. Particularly to you, > Bart, for all your debugging and testing, and to Balbir for following > up and figuring it out. > > Because this was a strange one. I'd like to second that praise - Bert went above and beyond what could be expected from or even hoped from someone who reports a regression that broke his machine. Also, Balbir diligently followed down the regression to a root cause that was far away from his original code of interest. It was nice to lurk in this thread. Thanks, Ingo