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GET /api/1.1/patches/2220898/?format=api
{ "id": 2220898, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220898/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260408114952.198028466@kernel.org/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/1.1/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260408114952.198028466@kernel.org>", "date": "2026-04-08T11:54:01", "name": "[V2,04/11] posix-timers: Handle the timer_[re]arm() return value", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": true, "hash": "e2f05d2b14e9886ec3c38758ce60efe2644698e4", "submitter": { "id": 92397, "url": "http://patchwork.ozlabs.org/api/1.1/people/92397/?format=api", "name": "Thomas Gleixner", "email": "tglx@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260408114952.198028466@kernel.org/mbox/", "series": [ { "id": 499126, "url": "http://patchwork.ozlabs.org/api/1.1/series/499126/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=499126", "date": "2026-04-08T11:53:41", "name": "hrtimers: Prevent hrtimer interrupt starvation", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/499126/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220898/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220898/checks/", "tags": {}, "headers": { "Return-Path": "\n <netfilter-devel+bounces-11717-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@vger.kernel.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=cTd0P04Q;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1775649245; cv=none;\n b=RvV9WDn1UNKSuyKhUFM645aHiMzbleiarp+oePgMBGYcDW9uF+w4P16WjBoqo5eZmMo3z1l1fCHJZPYK2hPM9MyPw71shbhGRlvcFzDTwjbxHBa37oEh4md10kCqXkN6ZfKBrBY8whpXqse0wU26Q75+s5M2fsCpWZ63jRFh/6Q=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1775649245; c=relaxed/simple;\n\tbh=C9YlNozrQiTNSBjvrTYffGhKh+u7r91EEMREnD1qMfE=;\n\th=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version:\n\t Content-Type;\n b=Uub1BpEHk+MCjIU40/+3Dfpp+tpHJKYuvL+Db+rK0HbWbhPwJrEmqeXDZOlhN1RhOUtv8U9rWDy1C5Z/RkUduCTdEf8ww+p2ppVBnn2v4/eAc4MOzZqyfOsG8Cy9wo7XLzS28xb3Y3HM3rFGRMHqnyfle+hPTAgIpEMilEl4nQk=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=cTd0P04Q; 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=1775649245;\n\tbh=C9YlNozrQiTNSBjvrTYffGhKh+u7r91EEMREnD1qMfE=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=cTd0P04QcW5sWAV4M3ecA9ZwxuQBkVlEfmkCIPp8nQ/F4/6lVOWvXT7jxqAUk2sAX\n\t s3EbPUYjjJI8hhcC0p1xpvFTOY/5ZtAnNAasYrfciwcZrKMu1SvFRCUtrgG1hzQYH0\n\t 7mutRly4w14FSfisZHRYME0s2HKa3y6KdyBoujOKJCG0CgYojtG3N+F0d7Kfv4sRdl\n\t gYCyixZut4E5c6mVxFgLjFIjjW5GIPDWWDNm9CIvL195lk1Jmo3HsYbTlf3ziueIzF\n\t UHNs6riSum5VfwPitpt9Zjlf5pOu4D/q6mHnsRguNsit13UlUEbdT6A9/v8gDFsfm2\n\t hDqWXeZrXHVMA==", "Date": "Wed, 08 Apr 2026 13:54:01 +0200", "Message-ID": "<20260408114952.198028466@kernel.org>", "User-Agent": "quilt/0.68", "From": "Thomas Gleixner <tglx@kernel.org>", "To": "LKML <linux-kernel@vger.kernel.org>", "Cc": "\"Peter Zijlstra (Intel)\" <peterz@infradead.org>,\n Anna-Maria Behnsen <anna-maria@linutronix.de>,\n Frederic Weisbecker <frederic@kernel.org>,\n Calvin Owens <calvin@wbinvd.org>,\n John Stultz <jstultz@google.com>,\n Stephen Boyd <sboyd@kernel.org>,\n Alexander Viro <viro@zeniv.linux.org.uk>,\n Christian Brauner <brauner@kernel.org>,\n Jan Kara <jack@suse.cz>,\n linux-fsdevel@vger.kernel.org,\n Sebastian Reichel <sre@kernel.org>,\n linux-pm@vger.kernel.org,\n Pablo Neira Ayuso <pablo@netfilter.org>,\n Florian Westphal <fw@strlen.de>,\n Phil Sutter <phil@nwl.cc>,\n netfilter-devel@vger.kernel.org,\n coreteam@netfilter.org", "Subject": "[patch V2 04/11] posix-timers: Handle the timer_[re]arm() return\n value", "References": "<20260408102356.783133335@kernel.org>", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8" }, "content": "The [re]arm callbacks will return true when the timer was queued and false\nif it was already expired at enqueue time.\n\nIn both cases the call sites can trivially queue the signal right there,\nwhen the timer was already expired. That avoids a full round trip through\nthe hrtimer interrupt.\n\nSigned-off-by: Thomas Gleixner <tglx@kernel.org>\nAcked-by: Peter Zijlstra (Intel) <peterz@infradead.org>\nCc: Anna-Maria Behnsen <anna-maria@linutronix.de>\nCc: Frederic Weisbecker <frederic@kernel.org>\n\n---\n kernel/time/posix-timers.c | 22 +++++++++++++++++-----\n 1 file changed, 17 insertions(+), 5 deletions(-)", "diff": "--- a/kernel/time/posix-timers.c\n+++ b/kernel/time/posix-timers.c\n@@ -299,6 +299,8 @@ static bool common_hrtimer_rearm(struct\n \n static bool __posixtimer_deliver_signal(struct kernel_siginfo *info, struct k_itimer *timr)\n {\n+\tbool queued;\n+\n \tguard(spinlock)(&timr->it_lock);\n \n \t/*\n@@ -312,12 +314,18 @@ static bool __posixtimer_deliver_signal(\n \tif (!timr->it_interval || WARN_ON_ONCE(timr->it_status != POSIX_TIMER_REQUEUE_PENDING))\n \t\treturn true;\n \n-\ttimr->kclock->timer_rearm(timr);\n-\ttimr->it_status = POSIX_TIMER_ARMED;\n+\t/* timer_rearm() updates timr::it_overrun */\n+\tqueued = timr->kclock->timer_rearm(timr);\n+\n \ttimr->it_overrun_last = timr->it_overrun;\n \ttimr->it_overrun = -1LL;\n \t++timr->it_signal_seq;\n \tinfo->si_overrun = timer_overrun_to_int(timr);\n+\n+\tif (queued)\n+\t\ttimr->it_status = POSIX_TIMER_ARMED;\n+\telse\n+\t\tposix_timer_queue_signal(timr);\n \treturn true;\n }\n \n@@ -905,9 +913,13 @@ int common_timer_set(struct k_itimer *ti\n \t\texpires = timens_ktime_to_host(timr->it_clock, expires);\n \tsigev_none = timr->it_sigev_notify == SIGEV_NONE;\n \n-\tkc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none);\n-\tif (!sigev_none)\n-\t\ttimr->it_status = POSIX_TIMER_ARMED;\n+\tif (kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none)) {\n+\t\tif (!sigev_none)\n+\t\t\ttimr->it_status = POSIX_TIMER_ARMED;\n+\t} else {\n+\t\t/* Timer was already expired, queue the signal */\n+\t\tposix_timer_queue_signal(timr);\n+\t}\n \treturn 0;\n }\n \n", "prefixes": [ "V2", "04/11" ] }