From patchwork Fri May 19 10:21:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13248178 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78BECC77B75 for ; Fri, 19 May 2023 10:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231974AbjESKeV (ORCPT ); Fri, 19 May 2023 06:34:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231927AbjESKeM (ORCPT ); Fri, 19 May 2023 06:34:12 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 457D710F4; Fri, 19 May 2023 03:34:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=giIQX2Zs4VTp0HoKM0lBH5Aj6/hHWaqvN+LCMp+82bc=; b=CA71o9xgUhDALWVpBZL3Kbb0us w28SqK/pSvpC8QCgu0cE5pQhHZtssq8nLJkLI3nn9B0xHjOLG5romDSz4bfcIqeKXpUhn7chPpoFP G82NWMaRlMLIomwhAnwgXykMyjFllI8R44sXXNauaW2R2+69VDJthz1fNlJ2Ah3OZTG1UkX44rZ1M t6/glWLZdH9w+df3kaRipZFxE2x8sn1A3AQVMI9u3N7PTr2SDj2lpRbBH3heuqhke29k6v4QVs+8w nBoFuK9RU64bsZwe0cbHuXq+4EXZYfKM0cENPc/LAEE0lzuRLi4+x9pysDMkYMay8uXWK2hK5X8lC ACU4n1tw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pzxPv-00FrWW-2I; Fri, 19 May 2023 10:32:59 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 224B4306138; Fri, 19 May 2023 12:32:56 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id CEB67235EF0A9; Fri, 19 May 2023 12:32:55 +0200 (CEST) Message-ID: <20230519102715.637420396@infradead.org> User-Agent: quilt/0.66 Date: Fri, 19 May 2023 12:21:05 +0200 From: Peter Zijlstra To: bigeasy@linutronix.de Cc: mark.rutland@arm.com, maz@kernel.org, catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, kernel@xen0n.name, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, pbonzini@redhat.com, wanpengli@tencent.com, vkuznets@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, jgross@suse.com, boris.ostrovsky@oracle.com, daniel.lezcano@linaro.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, rafael@kernel.org, peterz@infradead.org, longman@redhat.com, boqun.feng@gmail.com, pmladek@suse.com, senozhatsky@chromium.org, rostedt@goodmis.org, john.ogness@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, jstultz@google.com, sboyd@kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 07/13] math64: Always inline u128 version of mul_u64_u64_shr() References: <20230519102058.581557770@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In order to prevent the following complaint from happening, always inline the u128 variant of mul_u64_u64_shr() -- which is what x86_64 will use. vmlinux.o: warning: objtool: read_hv_sched_clock_tsc+0x5a: call to mul_u64_u64_shr.constprop.0() leaves .noinstr.text section It should compile into something like: asm("mul %[mul];" "shrd %rdx, %rax, %cl" : "+&a" (a) : "c" shift, [mul] "r" (mul) : "d"); Which is silly not to inline, but it happens. Signed-off-by: Peter Zijlstra (Intel) --- include/linux/math64.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -168,7 +168,7 @@ static __always_inline u64 mul_u64_u32_s #endif /* mul_u64_u32_shr */ #ifndef mul_u64_u64_shr -static inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift) +static __always_inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift) { return (u64)(((unsigned __int128)a * mul) >> shift); }