From nobody Thu Nov 28 08:04:13 2024 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 E601BC8FE; Wed, 2 Oct 2024 21:32:23 +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=1727904744; cv=none; b=JiCCuTC9QUirhd1ssu7fb3cQkZO7Xkd4eRCfpHL9dd2ME7E7J5bz216DLmY9J+wMg/XLHYrYK8ykGP8rnzQM+i99w5ZUOX90LKqSSsB90hlHQn3R1rYqG7Eynd7vHhI4kAr1dRXfD+BYF10ksIcUpArVThwLjDPoekTVuD2LJCY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727904744; c=relaxed/simple; bh=JFyO5QBBFZtIWWWibmX5p/OlJSVIM41iQwEIvpv80a8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=j4VEOh0u1uS+H1nkAJir/oLAY5Jc7ft7ZXoZALm9Omub56c1tgxo4EZXexKSCUK3IaZn7Iwp378NDgz6g4nrcaaC0ZD3RDf4vskmxDKnIC6pXq5n/QTCa2iVqIIB69svdXn5MXIAGBIM795RwvDoMqCaS6oxlrCsIygx2N1m6Lo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b7WbtM6V; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b7WbtM6V" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23221C4CEC2; Wed, 2 Oct 2024 21:32:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727904743; bh=JFyO5QBBFZtIWWWibmX5p/OlJSVIM41iQwEIvpv80a8=; h=From:To:Cc:Subject:Date:From; b=b7WbtM6V6dz97d0L2oyO0w0x4IglDQGYiWpCjC19LN5AGCgB3m+X0D9Epjhvz21Kg tabGGNGW0fKs/mdM5a+oA1U+koeob0RiU3jUmMr8dgDUEYOveTun4VTTrMb6Fh5JVi oyKyh3f7QHPRzVShN6ivEbmA/FSC1AZQYzKwR8zS0/ZHTanqxsJsyLgdcutgH/kdAb +eZbMqu/u9I0Vb/xap7ODonGe54Z8XE2R8UU+YbUE1NRuJ+qQfNMg+J7Z0E8wZKjsG OIeZVDRV+c95LxXSf0H9gw9mZIjizLawyNYmrfMTZ8LSmnXYZyIcF0B8aWAB/QmazD Z/eAKDXbTTD7A== From: Josh Poimboeuf To: "James E.J. Bottomley" , Helge Deller Cc: linux-kernel@vger.kernel.org, Sven Schnelle , linux-trace-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Mark Rutland , Peter Zijlstra Subject: [PATCH] parisc/ftrace: Fix function graph tracing disablement Date: Wed, 2 Oct 2024 14:32:04 -0700 Message-ID: <5962b9e161b2b9296509c3d65c7f16c11b07bd16.1727904678.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Due to an apparent copy-paste bug, the parisc implementation of ftrace_disable_ftrace_graph_caller() doesn't actually do anything. It enables the (already-enabled) static key rather than disabling it. The result is that after function graph tracing has been "disabled", any subsequent (non-graph) function tracing will inadvertently also enable the slow fgraph return address hijacking. Fixes: 98f2926171ae ("parisc/ftrace: use static key to enable/disable funct= ion graph tracer") Signed-off-by: Josh Poimboeuf --- arch/parisc/kernel/ftrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c index c91f9c2e61ed..f8d08eab7db8 100644 --- a/arch/parisc/kernel/ftrace.c +++ b/arch/parisc/kernel/ftrace.c @@ -87,7 +87,7 @@ int ftrace_enable_ftrace_graph_caller(void) =20 int ftrace_disable_ftrace_graph_caller(void) { - static_key_enable(&ftrace_graph_enable.key); + static_key_disable(&ftrace_graph_enable.key); return 0; } #endif --=20 2.46.0