From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0C3F32236FC; Tue, 8 Apr 2025 12:42:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116135; cv=none; b=ryY91vLtvN620vSdJJr1VvTLkzjBipzA+VC8G8DF40ARWfRmUdDy1yVceTunlO1niPmQaSFMPTkLGkYyLYMJLo2w/KXSNKjyD4TmkSpSRN8Q/m6WqTSUvsTeZL/mztA19bl6NmuoCHIK0Oup3R02I0Obie61Og6Xuzs/WFjL37s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116135; c=relaxed/simple; bh=04ElTJrxENLrbJO1zWJMlsxjHyQfWftvtAi86Q+rlAE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J9wCKuCOUX+r6pZc6QdmtVhBMrUxYrTbFPxVDRyNKiRr8JZMN/hZkO0tE9qc+yginH1PSmA53rmEFIAZ/+cyp37LE9FiCWM1DuuwRkK5a3w0z793McH/fKGcpuioS8g2FBxooRBhy07IWTc1MfGkMKycOwj61p9W5x1GWrmjUMg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HbhHDxos; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="HbhHDxos" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84F64C4CEE7; Tue, 8 Apr 2025 12:42:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744116134; bh=04ElTJrxENLrbJO1zWJMlsxjHyQfWftvtAi86Q+rlAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HbhHDxosbVxblNNmkZ3cnCHW3V00dNp+gEIESOphtoNxicjTP4ldVGkPVx4yYur/I q2Uh4oEOtbS4EyLjpBjauBij7KVWUmmWDPZ5EiaG+VEcSgSCYLYxXmmAPgt02lAKgz AGQ1Yu7+QyOQhrMe/abpeNM8pW+ogtCqCClKpR34= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tao Chen , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , "H. Peter Anvin" , Linus Torvalds , Sasha Levin Subject: [PATCH 6.12 028/423] perf/ring_buffer: Allow the EPOLLRDNORM flag for poll Date: Tue, 8 Apr 2025 12:45:54 +0200 Message-ID: <20250408104846.404668411@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104845.675475678@linuxfoundation.org> References: <20250408104845.675475678@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tao Chen [ Upstream commit c96fff391c095c11dc87dab35be72dee7d217cde ] The poll man page says POLLRDNORM is equivalent to POLLIN. For poll(), it seems that if user sets pollfd with POLLRDNORM in userspace, perf_poll will not return until timeout even if perf_output_wakeup called, whereas POLLIN returns. Fixes: 76369139ceb9 ("perf: Split up buffer handling from core code") Signed-off-by: Tao Chen Signed-off-by: Ingo Molnar Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: "H. Peter Anvin" Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250314030036.2543180-1-chen.dylane@linux.dev Signed-off-by: Sasha Levin --- kernel/events/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 4f46f688d0d49..bbfa22c0a1597 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -19,7 +19,7 @@ static void perf_output_wakeup(struct perf_output_handle *handle) { - atomic_set(&handle->rb->poll, EPOLLIN); + atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM); handle->event->pending_wakeup = 1; -- 2.39.5