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=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 8ABBEC3A59B for ; Fri, 30 Aug 2019 19:06:35 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 12AA22342E for ; Fri, 30 Aug 2019 19:06:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 12AA22342E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46KpqX4H34zDqPb for ; Sat, 31 Aug 2019 05:06:32 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=suse.de (client-ip=195.135.220.15; helo=mx1.suse.de; envelope-from=msuchanek@suse.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46Kpdv1CtQzDqrm for ; Sat, 31 Aug 2019 04:58:11 +1000 (AEST) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id BD13AAC84; Fri, 30 Aug 2019 18:58:07 +0000 (UTC) From: Michal Suchanek To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v6 3/6] powerpc/perf: consolidate read_user_stack_32 Date: Fri, 30 Aug 2019 20:57:54 +0200 Message-Id: <630c0889c1fb841bcd2054d90205e61d175b965b.1567188299.git.msuchanek@suse.de> X-Mailer: git-send-email 2.22.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Hildenbrand , Heiko Carstens , David Howells , Paul Mackerras , Breno Leitao , Michael Neuling , Nicolai Stange , Allison Randal , Geert Uytterhoeven , Joel Stanley , Firoz Khan , Michal Suchanek , Arnd Bergmann , Nicholas Piggin , Thomas Gleixner , Christian Brauner , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, "Eric W. Biederman" , Andrew Donnellan , Hari Bathini Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" There are two almost identical copies for 32bit and 64bit. The function is used only in 32bit code which will be split out in next patch so consolidate to one function. Signed-off-by: Michal Suchanek --- new patch in v6 --- arch/powerpc/perf/callchain.c | 25 +++++++++---------------- 1 file changed, 9 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index c84bbd4298a0..b7cdcce20280 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -165,22 +165,6 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) return read_user_stack_slow(ptr, ret, 8); } -static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) -{ - if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || - ((unsigned long)ptr & 3)) - return -EFAULT; - - pagefault_disable(); - if (!__get_user_inatomic(*ret, ptr)) { - pagefault_enable(); - return 0; - } - pagefault_enable(); - - return read_user_stack_slow(ptr, ret, 4); -} - static inline int valid_user_sp(unsigned long sp, int is_64) { if (!sp || (sp & 7) || sp > (is_64 ? TASK_SIZE : 0x100000000UL) - 32) @@ -295,6 +279,12 @@ static inline int current_is_64bit(void) } #else /* CONFIG_PPC64 */ +static int read_user_stack_slow(void __user *ptr, void *buf, int nb) +{ + return 0; +} +#endif /* CONFIG_PPC64 */ + /* * On 32-bit we just access the address and let hash_page create a * HPTE if necessary, so there is no need to fall back to reading @@ -313,9 +303,12 @@ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) rc = __get_user_inatomic(*ret, ptr); pagefault_enable(); + if (IS_ENABLED(CONFIG_PPC64) && rc) + return read_user_stack_slow(ptr, ret, 4); return rc; } +#ifndef CONFIG_PPC64 static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { -- 2.22.0