From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6D31C43334 for ; Tue, 12 Jul 2022 04:24:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 23829940045; Tue, 12 Jul 2022 00:24:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1C090940033; Tue, 12 Jul 2022 00:24:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 062BE940045; Tue, 12 Jul 2022 00:24:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id E82E9940033 for ; Tue, 12 Jul 2022 00:24:17 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id C108F3483C for ; Tue, 12 Jul 2022 04:24:17 +0000 (UTC) X-FDA: 79677155754.08.0228F27 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf21.hostedemail.com (Postfix) with ESMTP id 6D4D41C006B for ; Tue, 12 Jul 2022 04:24:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=X1H4iTaGBABhmn8tOuCBSLbmPwsiUysDxHfqz4KTFB0=; b=0M+SICsZdr6b34t1NTp14Vgb/L fpyen0doQO+i4tp+rZWBTPlHpvI5stRkmD0+5/Axt2gkOHZ5pLDEI7tep9nlJtVnTq6Lx6sONVc+L 7cbzob8jbqoBZhLKwZkZ7UDv9dPplq34qHrqWvLcglh1f7r5LOPBLmR8BCHPTWb6U4fAskUphOGeN JCACIktUx2K23iBO8kBGut0FhsaMlWFyAb8392pDCMkYzlKbR1byslNj+WYrUrdMDxO9NgWX1ahn+ +FyqjpLqDRoB8eECI5Ly5NZx20RzYhAQIiko0AiCHJt51k+LcmRj2Kn55gzC5oyQDlq+3qNX8wYnd nKRGVp2Q==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1oB7RM-007J5x-1f; Tue, 12 Jul 2022 04:24:04 +0000 Date: Mon, 11 Jul 2022 21:24:04 -0700 From: Luis Chamberlain To: Song Liu , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Masami Hiramatsu , "Naveen N. Rao" , "David S. Miller" , Anil S Keshavamurthy , Kees Cook Cc: Song Liu , bpf , Christoph Hellwig , Davidlohr Bueso , lkml , Linux-MM , Daniel Borkmann , Kernel Team , "x86@kernel.org" , "dave.hansen@linux.intel.com" , "rick.p.edgecombe@intel.com" , "linux-modules@vger.kernel.org" Subject: Re: [PATCH v6 bpf-next 0/5] bpf_prog_pack followup Message-ID: References: <20220707223546.4124919-1-song@kernel.org> <863A2D5B-976D-4724-AEB1-B2A494AD2BDB@fb.com> <6214B9C9-557B-4DC0-BFDE-77EAC425E577@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=0M+SICsZ; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=kernel.org (policy=none); spf=none (imf21.hostedemail.com: domain of mcgrof@infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=mcgrof@infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1657599857; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=X1H4iTaGBABhmn8tOuCBSLbmPwsiUysDxHfqz4KTFB0=; b=fEcGG1QThGo2Wi8h26rWeRq05bY16F1Ljv/UuGsT7s3fdxxbfbr72iyx1aNQsxz3BtrVfb 8EnCrmon+sFAUnQvmTHlnbsb7tr5HMYmAGjZTv9lg/zzkLnLlmvAHwYBCxwIgjUOT8AEX5 JHIPRnPgEWOSLqG085o5MclTC7E2mnk= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1657599857; a=rsa-sha256; cv=none; b=g2ULPp2wT3YxG0OJ+1gX6wP0EgYBelN/AK63a9O7TrZZ1HNHRjxcGfQvXT6+BWA/DQ+Gjz 0a92qziL3dV57zqY64Cdci8LZhC0RkFbM8GiHu/MSv+tt2TNz+jl1WIDUEN6a/rQgQnrVb Dpd67LcrBTtvp/3rL++RngeOYZZbBns= Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=0M+SICsZ; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=kernel.org (policy=none); spf=none (imf21.hostedemail.com: domain of mcgrof@infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=mcgrof@infradead.org X-Rspamd-Server: rspam06 X-Rspam-User: X-Stat-Signature: 97z9sy7bq1gzngq3hyia8n3uew14cnzy X-Rspamd-Queue-Id: 6D4D41C006B X-HE-Tag: 1657599857-991825 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000204, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jul 11, 2022 at 09:18:53PM -0700, Luis Chamberlain wrote: > A vmalloc_ro_exec() by definition would imply a text_poke(). > > Can kprobes, ftrace and modules use it too? It would be nice > so to not have to deal with the loose semantics on the user to > have to use set_vm_flush_reset_perms() on ro+x later, but > I think this can be addressed separately on a case by case basis. And who knows, if they can, and can also share a huge page allocator then they may also share similar performance improvements. Luis