From patchwork Fri Apr 30 05:53:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12232305 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 AD046C43460 for ; Fri, 30 Apr 2021 05:53:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 56E076144F for ; Fri, 30 Apr 2021 05:53:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 56E076144F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id ED9BA6B0082; Fri, 30 Apr 2021 01:53:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E89906B0083; Fri, 30 Apr 2021 01:53:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D50926B0085; Fri, 30 Apr 2021 01:53:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0192.hostedemail.com [216.40.44.192]) by kanga.kvack.org (Postfix) with ESMTP id B27DF6B0082 for ; Fri, 30 Apr 2021 01:53:52 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 82385364C for ; Fri, 30 Apr 2021 05:53:52 +0000 (UTC) X-FDA: 78087967104.14.C27EF54 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf17.hostedemail.com (Postfix) with ESMTP id 3EDDB40002C1 for ; Fri, 30 Apr 2021 05:53:48 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 422D861424; Fri, 30 Apr 2021 05:53:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1619762031; bh=eCX4eLein6ZKwumBcX9wQrbg9jdge0pTwDPxjMvvgnA=; h=Date:From:To:Subject:In-Reply-To:From; b=UTyNdoVIIl9QHs8yD8Jwl4mFRq1HJLCIhuuW2yu1fhIYooG7xenLEUTGu4Ay5nvyh mOqHsdoFvjMSQ85rYTRC+Zv5W2ZZXP3NemVpGi1DJ24rEnS3fj6dDqio5V+QrN22s/ uDf961WzowqACdsB+v68gACYjUh6lIcodJGjfUPk= Date: Thu, 29 Apr 2021 22:53:50 -0700 From: Andrew Morton To: akpm@linux-foundation.org, arnd@arndb.de, linux-mm@kvack.org, luc.vanoostenryck@gmail.com, mm-commits@vger.kernel.org, ojeda@kernel.org, torvalds@linux-foundation.org Subject: [patch 012/178] include/linux/compiler-gcc.h: sparse can do constant folding of __builtin_bswap*() Message-ID: <20210430055350.RQ7VgyFZj%akpm@linux-foundation.org> In-Reply-To: <20210429225251.02b6386d21b69255b4f6c163@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=UTyNdoVI; dmarc=none; spf=pass (imf17.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Stat-Signature: 7kapopigy9wsz1rgujz1im1fi3jj4itn X-Rspamd-Queue-Id: 3EDDB40002C1 X-Rspamd-Server: rspam05 Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf17; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619762028-798993 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Luc Van Oostenryck Subject: include/linux/compiler-gcc.h: sparse can do constant folding of __builtin_bswap*() Sparse can do constant folding of __builtin_bswap*() since 2017. Also, a much recent version of Sparse is needed anyway, see commit 6ec4476ac825 ("Raise gcc version requirement to 4.9"). So, remove the comment about sparse not being yet able to constant fold __builtin_bswap*() and remove the corresponding test of __CHECKER__. Link: https://lkml.kernel.org/r/20210226092236.99369-1-luc.vanoostenryck@gmail.com Signed-off-by: Luc Van Oostenryck Acked-by: Arnd Bergmann Acked-by: Miguel Ojeda Signed-off-by: Andrew Morton --- include/linux/compiler-gcc.h | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/include/linux/compiler-gcc.h~sparse-can-do-constant-folding-of-__builtin_bswap +++ a/include/linux/compiler-gcc.h @@ -90,15 +90,11 @@ */ #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) -/* - * sparse (__CHECKER__) pretends to be gcc, but can't do constant - * folding in __builtin_bswap*() (yet), so don't set these for it. - */ -#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__) +#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) #define __HAVE_BUILTIN_BSWAP32__ #define __HAVE_BUILTIN_BSWAP64__ #define __HAVE_BUILTIN_BSWAP16__ -#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */ +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ #if GCC_VERSION >= 70000 #define KASAN_ABI_VERSION 5