From patchwork Fri Nov 8 07:11:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shile Zhang X-Patchwork-Id: 11234195 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1C84C1390 for ; Fri, 8 Nov 2019 07:11:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EDF342087E for ; Fri, 8 Nov 2019 07:11:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730281AbfKHHL0 (ORCPT ); Fri, 8 Nov 2019 02:11:26 -0500 Received: from out4436.biz.mail.alibaba.com ([47.88.44.36]:13527 "EHLO out4436.biz.mail.alibaba.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729896AbfKHHLZ (ORCPT ); Fri, 8 Nov 2019 02:11:25 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R951e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04391;MF=shile.zhang@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0ThU5MwV_1573197070; Received: from e18g09479.et15sqa.tbsite.net(mailfrom:shile.zhang@linux.alibaba.com fp:SMTPD_---0ThU5MwV_1573197070) by smtp.aliyun-inc.com(127.0.0.1); Fri, 08 Nov 2019 15:11:22 +0800 From: shile.zhang@linux.alibaba.com To: Masahiro Yamada , Michal Marek , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Josh Poimboeuf , x86@kernel.org Cc: "H . Peter Anvin" , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, Shile Zhang Subject: [RFC PATCH v2 3/3] x86/unwind/orc: remove run-time ORC unwind tables sort Date: Fri, 8 Nov 2019 15:11:08 +0800 Message-Id: <20191108071108.72132-4-shile.zhang@linux.alibaba.com> X-Mailer: git-send-email 2.24.0.rc2 In-Reply-To: <20191108071108.72132-1-shile.zhang@linux.alibaba.com> References: <20191108071108.72132-1-shile.zhang@linux.alibaba.com> MIME-Version: 1.0 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org From: Shile Zhang The orc_unwind and orc_unwind_ip tables are sorted in vmlinux link phase at build time, just remove the run-time sort. Signed-off-by: Shile Zhang --- arch/x86/kernel/unwind_orc.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c index 332ae6530fa8..eccb9ac1e2fe 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -273,9 +273,10 @@ void __init unwind_init(void) return; } - /* Sort the .orc_unwind and .orc_unwind_ip tables: */ - sort(__start_orc_unwind_ip, num_entries, sizeof(int), orc_sort_cmp, - orc_sort_swap); + /* + * Note, orc_unwind and orc_unwind_ip tables has been sorted in + * vmlinux link phase at build time. Its ready for binary search. + */ /* Initialize the fast lookup table: */ lookup_num_blocks = orc_lookup_end - orc_lookup;