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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC841C32751 for ; Wed, 7 Aug 2019 14:57:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9005721EF2 for ; Wed, 7 Aug 2019 14:57:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=fossix-org.20150623.gappssmtp.com header.i=@fossix-org.20150623.gappssmtp.com header.b="KVVHNX5J" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388028AbfHGO5a (ORCPT ); Wed, 7 Aug 2019 10:57:30 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:45604 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387915AbfHGO53 (ORCPT ); Wed, 7 Aug 2019 10:57:29 -0400 Received: by mail-pl1-f193.google.com with SMTP id y8so41229555plr.12 for ; Wed, 07 Aug 2019 07:57:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fossix-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=dCjlN6WUVTqi9Ls8DV65kSTfioWg+e5KAofys5HWp+8=; b=KVVHNX5JdgxTMcjfH2tXB/29kUpAfAhrmRoufpzO/vtZ+qISQnJpPJLnpWCoPCzTMN XfnRticIn8zT0uTjjmBEV9iB7ftUuef53x68wIjX4F6D7OwQnzfMyBJvyza0UESjjVN5 0t7qBjnklPraDRg4XG8rqnojS3soobzpNE4PR0V5tJ3MkBLvx8u6pppKqee2H/mz0huX W/kBRB3alG00YfDaJoi3BEVZtip71Afa/UFamFeqwMoLULNzSRXbi3ymWfSG+7XMPJER c3C29nDYU8CTMWY0Vr/k3Haoxl9zrW+zoqLYJPvxXmnM+ge5crRQcBmTdqnDkD5CReHD n6KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dCjlN6WUVTqi9Ls8DV65kSTfioWg+e5KAofys5HWp+8=; b=CdcZrZfXNerA3kKO28gbmH8PYpwaShjKhMD1xSh821LUfWCSnuirNUZd9QP3trsQZ3 W+l65+o6U6Jds9hWtuYb43hX3oS3wAJLa3tfe8qi3uQOgv406FAxXunhoeBSn1MIVRGD wUM4i9LcCWHtZqsZOD7P50/fzjdQ/w6/33ZLysozWbxXXjejJ2NuCM5Pq+XaRX1XP5GE 7TZeoIKPrY2meDv+31sbXSCgOes+7IoZntUJE/Rs2LFNGVJIIFcXOOEJYA/K1HO1okpA 2ncG71Cxwhln2prjk7Q20Vbw/JxrHjl+9kQS+fOxo6s6mmycWcVxxjj6ewLRqDWLjonn He2A== X-Gm-Message-State: APjAAAU6q0/a/GaiPXOb3Fg3UeSCYq1G0IPDJkwG55uht8jUxyG7sHTR g2FlqBZoQwYUXlxK3tY9kudzAg== X-Google-Smtp-Source: APXvYqwgdGhG+bvstw2uSm2Nqd/uqXQrbMhYKPt9/CeAGqfLRAOLhojclnU6sDuu6tNz/RCahuCq7Q== X-Received: by 2002:a17:902:8490:: with SMTP id c16mr8748173plo.1.1565189849100; Wed, 07 Aug 2019 07:57:29 -0700 (PDT) Received: from santosiv.in.ibm.com.com ([183.82.17.96]) by smtp.gmail.com with ESMTPSA id l4sm93617475pff.50.2019.08.07.07.57.25 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 07 Aug 2019 07:57:28 -0700 (PDT) From: Santosh Sivaraj To: linuxppc-dev , Linux Kernel Cc: "Aneesh Kumar K.V" , Mahesh Salgaonkar , Reza Arbab , Balbir Singh , Chandan Rajendra , Michael Ellerman , Nicholas Piggin , christophe leroy , Thomas Gleixner , Ingo Molnar Subject: [PATCH v8 4/7] extable: Add function to search only kernel exception table Date: Wed, 7 Aug 2019 20:26:57 +0530 Message-Id: <20190807145700.25599-5-santosh@fossix.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190807145700.25599-1-santosh@fossix.org> References: <20190807145700.25599-1-santosh@fossix.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Certain architecture specific operating modes (e.g., in powerpc machine check handler that is unable to access vmalloc memory), the search_exception_tables cannot be called because it also searches the module exception tables if entry is not found in the kernel exception table. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Nicholas Piggin Signed-off-by: Santosh Sivaraj Reviewed-by: Nicholas Piggin --- include/linux/extable.h | 2 ++ kernel/extable.c | 11 +++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/extable.h b/include/linux/extable.h index 41c5b3a25f67..81ecfaa83ad3 100644 --- a/include/linux/extable.h +++ b/include/linux/extable.h @@ -19,6 +19,8 @@ void trim_init_extable(struct module *m); /* Given an address, look for it in the exception tables */ const struct exception_table_entry *search_exception_tables(unsigned long add); +const struct exception_table_entry * +search_kernel_exception_table(unsigned long addr); #ifdef CONFIG_MODULES /* For extable.c to search modules' exception tables. */ diff --git a/kernel/extable.c b/kernel/extable.c index e23cce6e6092..f6c9406eec7d 100644 --- a/kernel/extable.c +++ b/kernel/extable.c @@ -40,13 +40,20 @@ void __init sort_main_extable(void) } } +/* Given an address, look for it in the kernel exception table */ +const +struct exception_table_entry *search_kernel_exception_table(unsigned long addr) +{ + return search_extable(__start___ex_table, + __stop___ex_table - __start___ex_table, addr); +} + /* Given an address, look for it in the exception tables. */ const struct exception_table_entry *search_exception_tables(unsigned long addr) { const struct exception_table_entry *e; - e = search_extable(__start___ex_table, - __stop___ex_table - __start___ex_table, addr); + e = search_kernel_exception_table(addr); if (!e) e = search_module_extables(addr); return e; -- 2.20.1