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GET /api/patches/2221814/?format=api
{ "id": 2221814, "url": "http://patchwork.ozlabs.org/api/patches/2221814/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.727211419@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260410120318.727211419@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260410120318.727211419@kernel.org/", "date": "2026-04-10T12:19:52", "name": "[17/38] ext4: Replace get_cycles() usage with ktime_get()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c06cc6692667c07c0089e633f890f1e1c3d22bb6", "submitter": { "id": 92397, "url": "http://patchwork.ozlabs.org/api/people/92397/?format=api", "name": "Thomas Gleixner", "email": "tglx@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.727211419@kernel.org/mbox/", "series": [ { "id": 499449, "url": "http://patchwork.ozlabs.org/api/series/499449/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499449", "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/499449/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221814/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221814/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19587-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.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=jdPhw8GN;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823595;\n\tbh=QF8xu2w1ekYQn9h8hXu1i+73iAYxDniq8hK08qkXVok=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=jdPhw8GNcCbidbYQHfvNnynlBMQ6C8yak4JEVkjtLiGZL97Y3Kg6hDMEq3+pAZn9l\n\t eebAKa8zdYjNIUhQRVD9BnFcdpgh+r9+oY8nCOOBP3TXDWg59J0yEe49bjDh/j5GY1\n\t J/+Mrsj5Z9JlM/AmirqGD8HvbUDB7O2+WSvwYb2Dt2w8mdLS3mlRSvEUCA//cm+I50\n\t T3lnhTwlF7Ll8vkIeV4joWfasbaLJDpe8kQqwYnenbDJtbX6i3a/y8coaGgKPKMk+y\n\t /Al4CmKTrbd6SuhGXm70yx904ODj2E0CWQ5/8mFozaTW1DKtHUVqiCNDO1sI7Gfirg\n\t PX6BMdDjfEFyw==", "Date": "Fri, 10 Apr 2026 14:19:52 +0200", "Message-ID": "<20260410120318.727211419@kernel.org>", "User-Agent": "quilt/0.68", "From": "Thomas Gleixner <tglx@kernel.org>", "To": "LKML <linux-kernel@vger.kernel.org>", "Cc": "\"Theodore Tso\" <tytso@mit.edu>,\n linux-ext4@vger.kernel.org,\n 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 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", "Subject": "[patch 17/38] ext4: Replace get_cycles() usage with ktime_get()", "References": "<20260410120044.031381086@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "get_cycles() is not guaranteed to be functional on all systems/platforms\nand the values returned are unitless and not easy to map to something\nuseful.\n\nUse ktime_get() instead, which provides nanosecond timestamps and is\nfunctional everywhere.\n\nThis is part of a larger effort to limit get_cycles() usage to low level\narchitecture code.\n\nSigned-off-by: Thomas Gleixner <tglx@kernel.org>\nCc: \"Theodore Ts'o\" <tytso@mit.edu>\nCc: linux-ext4@vger.kernel.org\n---\n fs/ext4/mballoc.c | 4 ++--\n 1 file changed, 2 insertions(+), 2 deletions(-)", "diff": "--- a/fs/ext4/mballoc.c\n+++ b/fs/ext4/mballoc.c\n@@ -1289,7 +1289,7 @@ void ext4_mb_generate_buddy(struct super\n \text4_grpblk_t len;\n \tunsigned free = 0;\n \tunsigned fragments = 0;\n-\tunsigned long long period = get_cycles();\n+\tktime_t period = ktime_get();\n \n \t/* initialize buddy from bitmap which is aggregation\n \t * of on-disk bitmap and preallocations */\n@@ -1328,7 +1328,7 @@ void ext4_mb_generate_buddy(struct super\n \n \tclear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));\n \n-\tperiod = get_cycles() - period;\n+\tperiod = ktime_get() - period;\n \tatomic_inc(&sbi->s_mb_buddies_generated);\n \tatomic64_add(period, &sbi->s_mb_generation_time);\n }\n", "prefixes": [ "17/38" ] }