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 C65DF286B9 for ; Fri, 24 Nov 2023 15:30:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="inRrtOiP" Received: by smtp.kernel.org (Postfix) with ESMTPS id 49357C433CB for ; Fri, 24 Nov 2023 15:30:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700839817; bh=xDBaGiYym8xvwlx33eazKrc9ltAEjQoEohE64GRQlLw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=inRrtOiPR43ttrHvzPn91otENePi2FcBEyarL+qRKdLT1p6HWoV5ykK/9Qad2BVzV /AHScHzBPumo/DI9myevvIXT+yw0lnjUukZD9X9YCq9niO+hHiD8rTH1idv9dacmh/ Zaji5E9G8mab+/EEg65EiIEQL9bOxtYVdxv2thwOEtZle84D0pMeeEBbm7jIWGNOYk j5J+gX0816VEZdqBhMOAyyJpaFIbft40mdmQn8IB1DCPJRpJMo3K/sg0M3bWtShwtE nAR/J5Jr5eQXmKSkDmivKugd3FaonLsdctuv2prUQVCJfBCRoufMmrQAw4TTaqRTIo mAPH7hBpfOn0A== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 296D6C53BD3; Fri, 24 Nov 2023 15:30:17 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 215740] kernel warning: DMA-API: xhci_hcd: cacheline tracking EEXIST, overlapping mappings aren't supported Date: Fri, 24 Nov 2023 15:30:16 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: stern@rowland.harvard.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D215740 --- Comment #24 from Alan Stern (stern@rowland.harvard.edu) --- Sorry, submitted the update too soon. I meant to add: Incidentally, the check for overlapping DMA mappings does not take into acc= ount the possibility that a mapping can extend over several cache lines. Maybe = this wasn't deemed important enough to check for. But in any case, it seems clear that on x86 there shouldn't be anything wro= ng with allowing several different mappings to refer to the same cache line. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=