From patchwork Mon Apr 15 18:59:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 162257 Delivered-To: patch@linaro.org Received: by 2002:ac9:2a84:0:0:0:0:0 with SMTP id p4csp3169865oca; Mon, 15 Apr 2019 12:23:41 -0700 (PDT) X-Google-Smtp-Source: APXvYqwGXE7C7Ka8w/lkZgUe9QJtvrR4XYCgB5nWxrBw/pCehh7ZBxAi4308tAP00WKYE9YgjQ/N X-Received: by 2002:a17:902:110b:: with SMTP id d11mr38986793pla.275.1555356221067; Mon, 15 Apr 2019 12:23:41 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1555356221; cv=none; d=google.com; s=arc-20160816; b=CnoZRlSHQ3NUIu/6bdHv3FwPZYzGnDjisx776HbuqRZNGVTvjjkURFZMKiZ/ChH6ck BPhokAjB32BIhn5YQKk8NdcC1Tlf8OifUn7ZiCoNWkP+DvXZW1OIIOIPLrCSbJhyz07s ZK7aKQdMf6btnaiStxW7SLq/prtzH9I122HgtYZus7C38Sc6imq6Hs9StzX7SFt6/Hb7 MH8p865uXnCagMlIL5HHHOgQ1KwZhjSYwlQoB5iAtmH8HrHf4Qn3v1wtAF3s2dDJxauz m+TfX2TMGF/pkfL2/30MGfdxSJpDQP4bU/oY70S32GhY/XryygGCc2DBTIZ//lyBrthE mGkg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=nbad2nwe9PZMRwciM/HEv/a228W0p6So1yZBRbh04Jg=; b=Va33Gouqj0oD79bcKjnkdTK92AISISqnHBBFLF++6IbagrSAErTv2NO+ZXbP/UzdsD Gcx8vUNIrZBs/mV0rI0ku97SbIx3MCx2t8kcrlZ2Bpz9vQluWwqX7U5sdrhwq6wwLAuD bR8LN8y4i3Xkg84n35NmI8w4uN8N3Aahn4gwkzlW/DR4177fmckINfgGE6K/NlS4Ptkb iorh+ZbI8LrVMeB8ypHuToprVDV/xkdnvKBtH8IrHJX4KVumn5NJS3QPZ44i+/9hsFKY uzvkOFWpYMQDLOrziFQotfiFMCBBfxOFjVvrZAreV8QIgsWN3v8IBiPzBbITr1742E0t LsYg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=djwuJ4WS; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l184si29544879pge.425.2019.04.15.12.23.40; Mon, 15 Apr 2019 12:23:41 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=djwuJ4WS; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730610AbfDOTXi (ORCPT + 30 others); Mon, 15 Apr 2019 15:23:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:42224 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728568AbfDOTHV (ORCPT ); Mon, 15 Apr 2019 15:07:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 615EA21905; Mon, 15 Apr 2019 19:07:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555355239; bh=kCpm+MyXmaaPxl+WAR7wPjIj+5TZtAOJr4Lre1+Vvms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=djwuJ4WSptQ5vxVQfQLoaNudhGCuh8N+ED+hP1GMtB82JTaS9tG2Ul8SqUeB91lQm fRR5iMg2TgSYBp9S5Muc/ugY0nrqe8tZRYmg0OpuSf7j9CcE3ci2+jr6z3NRHXLhow e/b1Thy2HA5dXKfD+THqqqi/WJzJOSNvmfnNSzB8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , Nick Desaulniers , Zhao Qiang , Yalin Wang , Andrew Morton , Linus Torvalds Subject: [PATCH 4.19 063/101] include/linux/bitrev.h: fix constant bitrev Date: Mon, 15 Apr 2019 20:59:01 +0200 Message-Id: <20190415183743.823917556@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190415183740.341577907@linuxfoundation.org> References: <20190415183740.341577907@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann commit 6147e136ff5071609b54f18982dea87706288e21 upstream. clang points out with hundreds of warnings that the bitrev macros have a problem with constant input: drivers/hwmon/sht15.c:187:11: error: variable '__x' is uninitialized when used within its own initialization [-Werror,-Wuninitialized] u8 crc = bitrev8(data->val_status & 0x0F); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/bitrev.h:102:21: note: expanded from macro 'bitrev8' __constant_bitrev8(__x) : \ ~~~~~~~~~~~~~~~~~~~^~~~ include/linux/bitrev.h:67:11: note: expanded from macro '__constant_bitrev8' u8 __x = x; \ ~~~ ^ Both the bitrev and the __constant_bitrev macros use an internal variable named __x, which goes horribly wrong when passing one to the other. The obvious fix is to rename one of the variables, so this adds an extra '_'. It seems we got away with this because - there are only a few drivers using bitrev macros - usually there are no constant arguments to those - when they are constant, they tend to be either 0 or (unsigned)-1 (drivers/isdn/i4l/isdnhdlc.o, drivers/iio/amplifiers/ad8366.c) and give the correct result by pure chance. In fact, the only driver that I could find that gets different results with this is drivers/net/wan/slic_ds26522.c, which in turn is a driver for fairly rare hardware (adding the maintainer to Cc for testing). Link: http://lkml.kernel.org/r/20190322140503.123580-1-arnd@arndb.de Fixes: 556d2f055bf6 ("ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction") Signed-off-by: Arnd Bergmann Reviewed-by: Nick Desaulniers Cc: Zhao Qiang Cc: Yalin Wang Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- include/linux/bitrev.h | 46 +++++++++++++++++++++++----------------------- 1 file changed, 23 insertions(+), 23 deletions(-) --- a/include/linux/bitrev.h +++ b/include/linux/bitrev.h @@ -34,41 +34,41 @@ static inline u32 __bitrev32(u32 x) #define __constant_bitrev32(x) \ ({ \ - u32 __x = x; \ - __x = (__x >> 16) | (__x << 16); \ - __x = ((__x & (u32)0xFF00FF00UL) >> 8) | ((__x & (u32)0x00FF00FFUL) << 8); \ - __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \ - __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \ - __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \ - __x; \ + u32 ___x = x; \ + ___x = (___x >> 16) | (___x << 16); \ + ___x = ((___x & (u32)0xFF00FF00UL) >> 8) | ((___x & (u32)0x00FF00FFUL) << 8); \ + ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \ + ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \ + ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \ + ___x; \ }) #define __constant_bitrev16(x) \ ({ \ - u16 __x = x; \ - __x = (__x >> 8) | (__x << 8); \ - __x = ((__x & (u16)0xF0F0U) >> 4) | ((__x & (u16)0x0F0FU) << 4); \ - __x = ((__x & (u16)0xCCCCU) >> 2) | ((__x & (u16)0x3333U) << 2); \ - __x = ((__x & (u16)0xAAAAU) >> 1) | ((__x & (u16)0x5555U) << 1); \ - __x; \ + u16 ___x = x; \ + ___x = (___x >> 8) | (___x << 8); \ + ___x = ((___x & (u16)0xF0F0U) >> 4) | ((___x & (u16)0x0F0FU) << 4); \ + ___x = ((___x & (u16)0xCCCCU) >> 2) | ((___x & (u16)0x3333U) << 2); \ + ___x = ((___x & (u16)0xAAAAU) >> 1) | ((___x & (u16)0x5555U) << 1); \ + ___x; \ }) #define __constant_bitrev8x4(x) \ ({ \ - u32 __x = x; \ - __x = ((__x & (u32)0xF0F0F0F0UL) >> 4) | ((__x & (u32)0x0F0F0F0FUL) << 4); \ - __x = ((__x & (u32)0xCCCCCCCCUL) >> 2) | ((__x & (u32)0x33333333UL) << 2); \ - __x = ((__x & (u32)0xAAAAAAAAUL) >> 1) | ((__x & (u32)0x55555555UL) << 1); \ - __x; \ + u32 ___x = x; \ + ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \ + ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \ + ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \ + ___x; \ }) #define __constant_bitrev8(x) \ ({ \ - u8 __x = x; \ - __x = (__x >> 4) | (__x << 4); \ - __x = ((__x & (u8)0xCCU) >> 2) | ((__x & (u8)0x33U) << 2); \ - __x = ((__x & (u8)0xAAU) >> 1) | ((__x & (u8)0x55U) << 1); \ - __x; \ + u8 ___x = x; \ + ___x = (___x >> 4) | (___x << 4); \ + ___x = ((___x & (u8)0xCCU) >> 2) | ((___x & (u8)0x33U) << 2); \ + ___x = ((___x & (u8)0xAAU) >> 1) | ((___x & (u8)0x55U) << 1); \ + ___x; \ }) #define bitrev32(x) \ From patchwork Mon Apr 15 18:59:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 162252 Delivered-To: patch@linaro.org Received: by 2002:a02:c6d8:0:0:0:0:0 with SMTP id r24csp3297321jan; Mon, 15 Apr 2019 12:09:01 -0700 (PDT) X-Google-Smtp-Source: APXvYqwgGr+3r4jDIA0C1UYrUPzY8Hm3svaeHs90CuTE10Y+n5kuxhL7ZuoiMYINqlmoVSBnalhQ X-Received: by 2002:a17:902:599c:: with SMTP id p28mr14935102pli.70.1555355341831; Mon, 15 Apr 2019 12:09:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1555355341; cv=none; d=google.com; s=arc-20160816; b=mqzzhQv44eKDp8rs32AD78bZisUZ5LgaQTyuW9Es9dE7OeWtPJ34chXZqFoD5KUIiI 0gh7ul8YVVSFVvShl53e/QiNMroQgHDp3XgcCUzO5sJV6fLBbK/Hwrjn2MvARhdPYnXm r+l01pM/1m2rfyjr6kreHetvk5nDzbNbrilva4j4CeaxvJj86eXcWsmqgEZ/hhb2mD/9 I5vUO19u9JgrUxys7kCZSX6nNR8D1zWqBv4MSzZUz70EO23/8Ca7FI6HeBzzhsvK/Hve 7WeoAPZiAXNGcmdNUNVIFseBzW+xErLDBnAObxCZKCjLgoX302DjyHrIbCBiQrnNT8Xy mOIQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; 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[209.132.180.67]) by mx.google.com with ESMTP id l70si45682616pgd.242.2019.04.15.12.09.01; Mon, 15 Apr 2019 12:09:01 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oU9sUTlr; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730625AbfDOTJA (ORCPT + 30 others); Mon, 15 Apr 2019 15:09:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:44532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730598AbfDOTI6 (ORCPT ); Mon, 15 Apr 2019 15:08:58 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E83E92087C; Mon, 15 Apr 2019 19:08:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555355337; bh=qY7SeKY+Huge9Eq1hAK9oCstFZApOcYzOHXgmCs2CKo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oU9sUTlrCbp8k2hZXMPZOSiRGeYFZRAu36bTndfRH4l1Ed2hn4NMfjnetCKCsxhcY a7ZjN8cye1xWx029xryZfxl9dFiGXPgL2eX1bVidspclZ5FLJhftB7pp6vZMYAidOe 3RjfvHE4rXlp2gkP83fTPDRoHzkojeMlAUkfsSRg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kefeng Wang , Will Deacon Subject: [PATCH 4.19 082/101] arm64: backtrace: Dont bother trying to unwind the userspace stack Date: Mon, 15 Apr 2019 20:59:20 +0200 Message-Id: <20190415183744.750934705@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190415183740.341577907@linuxfoundation.org> References: <20190415183740.341577907@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Will Deacon commit 1e6f5440a6814d28c32d347f338bfef68bc3e69d upstream. Calling dump_backtrace() with a pt_regs argument corresponding to userspace doesn't make any sense and our unwinder will simply print "Call trace:" before unwinding the stack looking for user frames. Rather than go through this song and dance, just return early if we're passed a user register state. Cc: Fixes: 1149aad10b1e ("arm64: Add dump_backtrace() in show_regs") Reported-by: Kefeng Wang Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/traps.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -101,10 +101,16 @@ static void dump_instr(const char *lvl, void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk) { struct stackframe frame; - int skip; + int skip = 0; pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk); + if (regs) { + if (user_mode(regs)) + return; + skip = 1; + } + if (!tsk) tsk = current; @@ -125,7 +131,6 @@ void dump_backtrace(struct pt_regs *regs frame.graph = tsk->curr_ret_stack; #endif - skip = !!regs; printk("Call trace:\n"); do { /* skip until specified stack frame */ @@ -175,15 +180,13 @@ static int __die(const char *str, int er return ret; print_modules(); - __show_regs(regs); pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n", TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), end_of_stack(tsk)); + show_regs(regs); - if (!user_mode(regs)) { - dump_backtrace(regs, tsk); + if (!user_mode(regs)) dump_instr(KERN_EMERG, regs); - } return ret; }