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GET /api/1.2/patches/2221848/?format=api
{ "id": 2221848, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2221848/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260410120318.121043259@kernel.org/", "project": { "id": 10, "url": "http://patchwork.ozlabs.org/api/1.2/projects/10/?format=api", "name": "Linux SPARC Development ", "link_name": "sparclinux", "list_id": "sparclinux.vger.kernel.org", "list_email": "sparclinux@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260410120318.121043259@kernel.org>", "list_archive_url": null, "date": "2026-04-10T12:19:08", "name": "[08/38] x86/tsc: Use rdtsc() instead of get_cycles()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d61d821fd3567ca3b8d1aa5189513de1ec3c4a85", "submitter": { "id": 92397, "url": "http://patchwork.ozlabs.org/api/1.2/people/92397/?format=api", "name": "Thomas Gleixner", "email": "tglx@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260410120318.121043259@kernel.org/mbox/", "series": [ { "id": 499450, "url": "http://patchwork.ozlabs.org/api/1.2/series/499450/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/list/?series=499450", "date": "2026-04-10T12:18:27", "name": "treewide: Cleanup LATCH, CLOCK_TICK_RATE and get_cycles() [ab]use", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499450/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221848/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221848/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=E4YH=CJ=vger.kernel.org=sparclinux+bounces-6656-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "sparclinux@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=YwhpP/sf;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775823551; c=relaxed/simple;\n\tbh=bea3byi4f+lJwA9RE9L4RIIWG0LfPmc09XAUdHtlAlE=;\n\th=Date:Message-ID:From:To:Subject:References:MIME-Version:\n\t Content-Type:cc;\n b=uGpT1AiSAr6h9n0GuuSfkG3onoJpNqNwUxMKeAdYGd/A7E5CeZ+0ov7ASXousy/aPcBeiA5onN4l/Jg/p8ouE1RM207z0wtwddA/X49s6JYNzeocBB0FD3If/ow0mRlbh9MpiRgNglAjIoOOZSQiiqgMGSXtrdSw5p1WuNB/hWg=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=YwhpP/sf; dkim-atps=neutral;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=sparclinux+bounces-6656-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=YwhpP/sf; arc=none smtp.client-ip=10.30.226.201" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823550;\n\tbh=bea3byi4f+lJwA9RE9L4RIIWG0LfPmc09XAUdHtlAlE=;\n\th=Date:From:To:Subject:References:cc:From;\n\tb=YwhpP/sfl2uNAokHMGyDzPyXqsYG5Z3HHapkhzwVASiSkGSv1ImeSFBY018VYZGU6\n\t EPRk8H/tD4bE94DCGFfik82fydH/mvkzeKH2zcGHFzmiPQlK2yTJNXmBvp6CR6/aKP\n\t ZUXJ1ridIfNl+octSklnUsCiAFVq0bMAbDZHArZ2XlGiEpILEnKNdARJlXe1YoLGU7\n\t gTGiAjrmuKfAH7Stm5YSWpKnJ3J0WABG0fiD/+Dm/7aJCfY6aDBkC0dcXhqkELemEA\n\t OLCKD9b/UmnIij2UMaT5laELpK9/RUq1POEHXDOcdk6mujQiavRoj/L2U3OHpVV16q\n\t LiEll066ex31A==", "Date": "Fri, 10 Apr 2026 14:19:08 +0200", "Message-ID": "<20260410120318.121043259@kernel.org>", "User-Agent": "quilt/0.68", "From": "Thomas Gleixner <tglx@kernel.org>", "To": "LKML <linux-kernel@vger.kernel.org>", "Subject": "[patch 08/38] x86/tsc: Use rdtsc() instead of get_cycles()", "References": "<20260410120044.031381086@kernel.org>", "Precedence": "bulk", "X-Mailing-List": "sparclinux@vger.kernel.org", "List-Id": "<sparclinux.vger.kernel.org>", "List-Subscribe": "<mailto:sparclinux+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:sparclinux+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "cc": "Arnd Bergmann <arnd@arndb.de>,\n x86@kernel.org,\n Lu Baolu <baolu.lu@linux.intel.com>,\n iommu@lists.linux.dev,\n Michael Grzeschik <m.grzeschik@pengutronix.de>,\n netdev@vger.kernel.org,\n linux-wireless@vger.kernel.org,\n Herbert Xu <herbert@gondor.apana.org.au>,\n linux-crypto@vger.kernel.org,\n Vlastimil Babka <vbabka@kernel.org>,\n linux-mm@kvack.org,\n David Woodhouse <dwmw2@infradead.org>,\n Bernie Thompson <bernie@plugable.com>,\n linux-fbdev@vger.kernel.org,\n \"Theodore Tso\" <tytso@mit.edu>,\n linux-ext4@vger.kernel.org,\n Andrew Morton <akpm@linux-foundation.org>,\n Uladzislau Rezki <urezki@gmail.com>,\n Marco Elver <elver@google.com>,\n Dmitry Vyukov <dvyukov@google.com>,\n kasan-dev@googlegroups.com,\n Andrey Ryabinin <ryabinin.a.a@gmail.com>,\n Thomas Sailer <t.sailer@alumni.ethz.ch>,\n linux-hams@vger.kernel.org,\n \"Jason A. Donenfeld\" <Jason@zx2c4.com>,\n Richard Henderson <richard.henderson@linaro.org>,\n linux-alpha@vger.kernel.org,\n Russell King <linux@armlinux.org.uk>,\n linux-arm-kernel@lists.infradead.org,\n Catalin Marinas <catalin.marinas@arm.com>,\n Huacai Chen <chenhuacai@kernel.org>,\n loongarch@lists.linux.dev,\n Geert Uytterhoeven <geert@linux-m68k.org>,\n linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen <dinguyen@kernel.org>,\n Jonas Bonn <jonas@southpole.se>,\n linux-openrisc@vger.kernel.org,\n Helge Deller <deller@gmx.de>,\n linux-parisc@vger.kernel.org,\n Michael Ellerman <mpe@ellerman.id.au>,\n linuxppc-dev@lists.ozlabs.org,\n Paul Walmsley <pjw@kernel.org>,\n linux-riscv@lists.infradead.org,\n Heiko Carstens <hca@linux.ibm.com>,\n linux-s390@vger.kernel.org,\n \"David S. Miller\" <davem@davemloft.net>,\n sparclinux@vger.kernel.org", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "This code knows that TSC is available so there is no point to use the TSC\nfeature guarded get_cycles().\n\nNo functional change.\n\nSigned-off-by: Thomas Gleixner <tglx@kernel.org>\n---\n arch/x86/kernel/tsc.c | 12 ++++++------\n 1 file changed, 6 insertions(+), 6 deletions(-)", "diff": "--- a/arch/x86/kernel/tsc.c\n+++ b/arch/x86/kernel/tsc.c\n@@ -371,12 +371,12 @@ static u64 tsc_read_refs(u64 *p, int hpe\n \tint i;\n \n \tfor (i = 0; i < MAX_RETRIES; i++) {\n-\t\tt1 = get_cycles();\n+\t\tt1 = rdtsc();\n \t\tif (hpet)\n \t\t\t*p = hpet_readl(HPET_COUNTER) & 0xFFFFFFFF;\n \t\telse\n \t\t\t*p = acpi_pm_read_early();\n-\t\tt2 = get_cycles();\n+\t\tt2 = rdtsc();\n \t\tif ((t2 - t1) < thresh)\n \t\t\treturn t2;\n \t}\n@@ -468,13 +468,13 @@ static unsigned long pit_calibrate_tsc(u\n \toutb(latch & 0xff, 0x42);\n \toutb(latch >> 8, 0x42);\n \n-\ttsc = t1 = t2 = get_cycles();\n+\ttsc = t1 = t2 = rdtsc();\n \n \tpitcnt = 0;\n \ttscmax = 0;\n \ttscmin = ULONG_MAX;\n \twhile ((inb(0x61) & 0x20) == 0) {\n-\t\tt2 = get_cycles();\n+\t\tt2 = rdtsc();\n \t\tdelta = t2 - tsc;\n \t\ttsc = t2;\n \t\tif ((unsigned long) delta < tscmin)\n@@ -553,9 +553,9 @@ static inline int pit_expect_msb(unsigne\n \t\tif (!pit_verify_msb(val))\n \t\t\tbreak;\n \t\tprev_tsc = tsc;\n-\t\ttsc = get_cycles();\n+\t\ttsc = rdtsc();\n \t}\n-\t*deltap = get_cycles() - prev_tsc;\n+\t*deltap = rdtsc() - prev_tsc;\n \t*tscp = tsc;\n \n \t/*\n", "prefixes": [ "08/38" ] }