From patchwork Sun Jan 2 07:06:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Randy Dunlap X-Patchwork-Id: 12702178 X-Patchwork-Delegate: jgg@ziepe.ca 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8F732C433F5 for ; Sun, 2 Jan 2022 07:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232864AbiABHGZ (ORCPT ); Sun, 2 Jan 2022 02:06:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229520AbiABHGY (ORCPT ); Sun, 2 Jan 2022 02:06:24 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF23EC061574; Sat, 1 Jan 2022 23:06:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: Content-Type:MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-ID:Content-Description:In-Reply-To:References; bh=Q0ej29B2j8z2ws8+2YZINTmx55/6VfNY4BKK9M/i8rU=; b=NpkxujGjDDq5zLPA7hBZ9ZBIXF Vv/QrXQdckNvHXp1o9YZRPJEgsZr2nkg+73hc8BKw4iy3CHuvGxMIleMmAzg27AJDmW9t/rWFFmSf ibSYcF+QzUtPqkLcojAE7Ws7zDzVdj39g5Uuqw/UfCazmEGHntKA/IwpTPxXqBokbY7Yqv4Gusjns QnazMvqArdmoP4PVB75V2KjbU1qek4nuPhUnTzNSJkQZrLnGOvU3IflbWsOEtism1tpPixCH7R1yL 2bIsXDAa4ITn0Nq6d6CvnB97AtPPymCGx8oFf32FmVkdJykNtmnsXODYw8/1Qd/KJuVDNvlbBMs5Y YqPw6+0w==; Received: from [2601:1c0:6280:3f0::aa0b] (helo=bombadil.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1n3uwi-007cUw-60; Sun, 02 Jan 2022 07:06:24 +0000 From: Randy Dunlap To: linux-kernel@vger.kernel.org, Jason Gunthorpe , Jeff Dike , Richard Weinberger , Anton Ivanov , Johannes Berg Cc: linux-rdma@vger.kernel.org, linux-um@lists.infradead.org, Randy Dunlap Subject: [PATCH 2/2] IB/rdmavt: modify rdmavt/qp.c for UML Date: Sat, 1 Jan 2022 23:06:23 -0800 Message-Id: <20220102070623.24009-1-rdunlap@infradead.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org When building rdmavt for ARCH=um, qp.c has a build error on a reference to the x86-specific cpuinfo field 'x86_cache_size'. This value is then used to determine whether to use cacheless_memcpy() or not. Provide a fake value to LLC for CONFIG_UML. Then provide a separate verison of cacheless_memcpy() for CONFIG_UML that is just a plain memcpy(), like the calling code uses. Prevents these build errors: ../drivers/infiniband/sw/rdmavt/qp.c: In function ‘rvt_wss_llc_size’: ../drivers/infiniband/sw/rdmavt/qp.c:88:23: error: ‘struct cpuinfo_um’ has no member named ‘x86_cache_size’; did you mean ‘x86_capability’? return boot_cpu_data.x86_cache_size; ../drivers/infiniband/sw/rdmavt/qp.c: In function ‘cacheless_memcpy’: ../drivers/infiniband/sw/rdmavt/qp.c:100:2: error: implicit declaration of function ‘__copy_user_nocache’; did you mean ‘copy_user_page’? [-Werror=implicit-function-declaration] __copy_user_nocache(dst, (void __user *)src, n, 0); Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver") Signed-off-by: Randy Dunlap --- drivers/infiniband/sw/rdmavt/qp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- linux-next-20211224.orig/drivers/infiniband/sw/rdmavt/qp.c +++ linux-next-20211224/drivers/infiniband/sw/rdmavt/qp.c @@ -84,10 +84,15 @@ EXPORT_SYMBOL(ib_rvt_state_ops); /* platform specific: return the last level cache (llc) size, in KiB */ static int rvt_wss_llc_size(void) { +#if !defined(CONFIG_UML) /* assume that the boot CPU value is universal for all CPUs */ return boot_cpu_data.x86_cache_size; +#else /* CONFIG_UML */ + return 1024; /* fake 1 MB LLC size */ +#endif } +#if !defined(CONFIG_UML) /* platform specific: cacheless copy */ static void cacheless_memcpy(void *dst, void *src, size_t n) { @@ -99,6 +104,13 @@ static void cacheless_memcpy(void *dst, */ __copy_user_nocache(dst, (void __user *)src, n, 0); } +#else +/* for CONFIG_UML, this is just a plain memcpy() */ +static void cacheless_memcpy(void *dst, void *src, size_t n) +{ + memcpy(dst, src, n); +} +#endif void rvt_wss_exit(struct rvt_dev_info *rdi) {