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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 62523F4484C for ; Fri, 10 Apr 2026 12:19:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CE27E6B009F; Fri, 10 Apr 2026 08:19:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C92D66B00A0; Fri, 10 Apr 2026 08:19:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B82666B00A1; Fri, 10 Apr 2026 08:19:13 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id A3AE86B009F for ; Fri, 10 Apr 2026 08:19:13 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 433598BC13 for ; Fri, 10 Apr 2026 12:19:13 +0000 (UTC) X-FDA: 84642550986.09.AE460C3 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf18.hostedemail.com (Postfix) with ESMTP id BBAF11C000A for ; Fri, 10 Apr 2026 12:19:11 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="YwhpP/sf"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf18.hostedemail.com: domain of tglx@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=tglx@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775823551; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding:in-reply-to: references:references:dkim-signature; bh=hS8C4KqVeUlIUjtSj7w2Upw8HyApf1Pu0cIqAYxRChU=; b=uJRL4hmt0k0T3bS83qnxtRrQneh51OXza2xMTgJMHtFVm3Gak/ZEjiibeZI/CA9RA0RxHi fkty3o6653Rlxm0EoJ/IqApILQ9IQuO1piuDtIf9rqYzmAxvMgmv9dSp7UvJMX5fMmqwVn Qqw05ONgi80DFNnU9PeTl3Q/cHCBwgE= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1775823551; a=rsa-sha256; cv=none; b=rM83bmVaYljvac0VIG89pSFAZWWW0Qv6rF9q/B9CphVjpKV1sddGxX47zxTH92I9GikIeW RGZhnqebHDs4Cd8K772QmNzysCA0gfAyeX2Meji0dHFKliFeyscLz6VyuZFgVcXM37FBgo FV4Y79fagfDqNSsBYae+zO9z8dq6eBQ= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="YwhpP/sf"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf18.hostedemail.com: domain of tglx@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=tglx@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 32D916024D; Fri, 10 Apr 2026 12:19:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 455B0C2BC87; Fri, 10 Apr 2026 12:19:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775823550; bh=bea3byi4f+lJwA9RE9L4RIIWG0LfPmc09XAUdHtlAlE=; h=Date:From:To:Subject:References:cc:From; b=YwhpP/sfl2uNAokHMGyDzPyXqsYG5Z3HHapkhzwVASiSkGSv1ImeSFBY018VYZGU6 EPRk8H/tD4bE94DCGFfik82fydH/mvkzeKH2zcGHFzmiPQlK2yTJNXmBvp6CR6/aKP ZUXJ1ridIfNl+octSklnUsCiAFVq0bMAbDZHArZ2XlGiEpILEnKNdARJlXe1YoLGU7 gTGiAjrmuKfAH7Stm5YSWpKnJ3J0WABG0fiD/+Dm/7aJCfY6aDBkC0dcXhqkELemEA OLCKD9b/UmnIij2UMaT5laELpK9/RUq1POEHXDOcdk6mujQiavRoj/L2U3OHpVV16q LiEll066ex31A== Date: Fri, 10 Apr 2026 14:19:08 +0200 Message-ID: <20260410120318.121043259@kernel.org> User-Agent: quilt/0.68 From: Thomas Gleixner To: LKML Subject: [patch 08/38] x86/tsc: Use rdtsc() instead of get_cycles() References: <20260410120044.031381086@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 cc: Arnd Bergmann , x86@kernel.org, Lu Baolu , iommu@lists.linux.dev, Michael Grzeschik , netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Herbert Xu , linux-crypto@vger.kernel.org, Vlastimil Babka , linux-mm@kvack.org, David Woodhouse , Bernie Thompson , linux-fbdev@vger.kernel.org, "Theodore Tso" , linux-ext4@vger.kernel.org, Andrew Morton , Uladzislau Rezki , Marco Elver , Dmitry Vyukov , kasan-dev@googlegroups.com, Andrey Ryabinin , Thomas Sailer , linux-hams@vger.kernel.org, "Jason A. Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Huacai Chen , loongarch@lists.linux.dev, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Dinh Nguyen , Jonas Bonn , linux-openrisc@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , linux-riscv@lists.infradead.org, Heiko Carstens , linux-s390@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org X-Rspamd-Queue-Id: BBAF11C000A X-Stat-Signature: ocgpe5cd996mygzcy8ur9hjd88mfnfj7 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775823551-40472 X-HE-Meta: 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 70hhorrl ZriT/I3/K1uzURdWX45mkln0qJa73n+Uc9UIvWmtRYbRh/BWB6fjMwa2/k/5qDlQEn+2OR+dzrLcXqoUKo8LGiE1zI0CPL5IAhFCoCfcpTxs/waD1lN3omciOihP2eZ9mU43J/ho0u4jjmIzCFq6lEI8mn3fY8BiTsx3EZme6qj/xv4efXMpj30ZTt0HxYNOmlabqPvd5WaUwBleIA/Zi9k0oUFZVPP6qaV8rQwyvB/6s+PPFl2FSx0xCGxusqdnG6enB9YmaYNzVgiGjRXy2rveBrJ9HoE4YWOO74ISV5iIaLswq+Y601mZs8oHGRuqccINTbUFt7v0DWAEQPMVZw/kuq3h5uTOitAHZORH8bk1qtIQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This code knows that TSC is available so there is no point to use the TSC feature guarded get_cycles(). No functional change. Signed-off-by: Thomas Gleixner --- arch/x86/kernel/tsc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -371,12 +371,12 @@ static u64 tsc_read_refs(u64 *p, int hpe int i; for (i = 0; i < MAX_RETRIES; i++) { - t1 = get_cycles(); + t1 = rdtsc(); if (hpet) *p = hpet_readl(HPET_COUNTER) & 0xFFFFFFFF; else *p = acpi_pm_read_early(); - t2 = get_cycles(); + t2 = rdtsc(); if ((t2 - t1) < thresh) return t2; } @@ -468,13 +468,13 @@ static unsigned long pit_calibrate_tsc(u outb(latch & 0xff, 0x42); outb(latch >> 8, 0x42); - tsc = t1 = t2 = get_cycles(); + tsc = t1 = t2 = rdtsc(); pitcnt = 0; tscmax = 0; tscmin = ULONG_MAX; while ((inb(0x61) & 0x20) == 0) { - t2 = get_cycles(); + t2 = rdtsc(); delta = t2 - tsc; tsc = t2; if ((unsigned long) delta < tscmin) @@ -553,9 +553,9 @@ static inline int pit_expect_msb(unsigne if (!pit_verify_msb(val)) break; prev_tsc = tsc; - tsc = get_cycles(); + tsc = rdtsc(); } - *deltap = get_cycles() - prev_tsc; + *deltap = rdtsc() - prev_tsc; *tscp = tsc; /*