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 850CCC432C0 for ; Tue, 26 Nov 2019 21:19:57 +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 3476D2071E for ; Tue, 26 Nov 2019 21:19:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3476D2071E 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 lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 47Mxcp3xS6zDqN6 for ; Wed, 27 Nov 2019 08:19:54 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) 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 47Mw9h6yPmzDqXS for ; Wed, 27 Nov 2019 07:14:48 +1100 (AEDT) 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 F1E23B14B; Tue, 26 Nov 2019 20:14:45 +0000 (UTC) From: Michal Suchanek To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 31/35] powerpc/perf: consolidate valid_user_sp Date: Tue, 26 Nov 2019 21:13:45 +0100 Message-Id: X-Mailer: git-send-email 2.23.0 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: Madhavan Srinivasan , David Hildenbrand , Heiko Carstens , Claudio Carvalho , David Howells , Masahiro Yamada , Paul Mackerras , Christian Brauner , Breno Leitao , Michael Neuling , Nicolai Stange , Diana Craciun , Firoz Khan , Allison Randal , Mahesh Salgaonkar , Geert Uytterhoeven , "Naveen N. Rao" , Michal Suchanek , Valentin Schneider , Jagadeesh Pagadala , Arnd Bergmann , Nicholas Piggin , Alexander Viro , Steven Rostedt , Thomas Gleixner , Dmitry Vyukov , Daniel Axtens , Gustavo Romero , Mathieu Malaterre , Greg Kroah-Hartman , Oleg Nesterov , linux-kernel@vger.kernel.org, "Eric W. Biederman" , Andrew Donnellan , Brajeswar Ghosh , Hari Bathini , Andrew Morton Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Merge the 32bit and 64bit version. Halve the check constants on 32bit. Use STACK_TOP since it is defined. Passing is_64 is now redundant since is_32bit_task() is used to determine which callchain variant should be used. Use STACK_TOP and is_32bit_task() directly. This removes a page from the valid 32bit area on 64bit: #define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE)) #define STACK_TOP_USER32 TASK_SIZE_USER32 Signed-off-by: Michal Suchanek --- v8: new patch v11: simplify by using is_32bit_task() --- arch/powerpc/perf/callchain.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index c6c4c609cc14..a22a19975a19 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -102,6 +102,15 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re } } +static inline int valid_user_sp(unsigned long sp) +{ + bool is_64 = !is_32bit_task(); + + if (!sp || (sp & (is_64 ? 7 : 3)) || sp > STACK_TOP - (is_64 ? 32 : 16)) + return 0; + return 1; +} + #ifdef CONFIG_PPC64 /* * On 64-bit we don't want to invoke hash_page on user addresses from @@ -165,13 +174,6 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) return read_user_stack_slow(ptr, ret, 8); } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > (is_64 ? TASK_SIZE : 0x100000000UL) - 32) - return 0; - return 1; -} - /* * 64-bit user processes use the same stack frame for RT and non-RT signals. */ @@ -230,7 +232,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, while (entry->nr < entry->max_stack) { fp = (unsigned long __user *) sp; - if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp)) + if (!valid_user_sp(sp) || read_user_stack_64(fp, &next_sp)) return; if (level > 0 && read_user_stack_64(&fp[2], &next_ip)) return; @@ -279,13 +281,6 @@ static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry { } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > TASK_SIZE - 32) - return 0; - return 1; -} - #define __SIGNAL_FRAMESIZE32 __SIGNAL_FRAMESIZE #define sigcontext32 sigcontext #define mcontext32 mcontext @@ -428,7 +423,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, while (entry->nr < entry->max_stack) { fp = (unsigned int __user *) (unsigned long) sp; - if (!valid_user_sp(sp, 0) || read_user_stack_32(fp, &next_sp)) + if (!valid_user_sp(sp) || read_user_stack_32(fp, &next_sp)) return; if (level > 0 && read_user_stack_32(&fp[1], &next_ip)) return; -- 2.23.0